Chelated Zinc EDTA Fertilizer 14% Zn
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Water-soluble zinc micronutrient · 14% Zn · EDTA chelated
About Chelated Zinc EDTA 14% Zn
Chelated Zinc EDTA is a fully chelated, water-soluble powdered zinc fertilizer with a guaranteed 14.0% zinc, all of it chelated by EDTA. Use it to prevent or correct a confirmed zinc deficiency: applied to the soil, metered through drip, sprinkler, or furrow irrigation, sprayed on the foliage when soil application is impractical, or weighed into a hydroponic or fertigation recipe. It supplies zinc only; it is not a complete fertilizer.
Zinc deficiency is most likely on sandy or low-organic-matter soils, on ground where topsoil has been removed or eroded, on calcareous and high-pH soils, and in cool early-spring soil. University of Florida IFAS notes that crops may be susceptible above soil pH 7.3. Confirm the deficiency with a soil test or plant tissue test before you buy.
- 14.0% Zn All of it chelated by EDTA. Each pound of product supplies 0.14 lb (63.5 g) of zinc
- 4–12 lb / acre Manufacturer soil rate for vegetable and field crops, by product weight (4–15 lb for tree and vine crops). Individual-tree, turf, foliar, and reservoir directions are in Application rates
- 1–25 lb bags Four sizes. The size calculator below weighs the dose for your area, trees, spray, or reservoir and recommends a bag
Product facts & composition
| Specification | Detail |
|---|---|
| Zinc (Zn) | 14.0% |
| Chelated zinc (Zn) | 14.0%. All of the zinc is chelated. |
| Derived from | Zinc EDTA (disodium zinc ethylenediaminetetraacetate) |
| Nitrogen, phosphate, potash | None declared. This is a micronutrient source, not an N–P₂O₅–K₂O fertilizer. |
| Physical form | Fully chelated, water-soluble powder |
| Solubility and mixing | Dissolves in water or fluid fertilizer and can be dry-blended with water-soluble fertilizers. A 2% solution measures about pH 6–8. |
| Hazard classification | Not classified as hazardous; no signal word |
| Package sizes | 1 lb, 2 lb, 5 lb, and 25 lb |
| Name and address on the label | Greenway Biotech, Inc., 17861 Road 24, Madera, California 93638 |
Percentages are by weight of product. 1 oz of product contains 3.97 g of zinc, a 1 lb bag contains 63.5 g (2.24 oz) of zinc, and a 25 lb bag contains 3.5 lb of zinc. Every rate on this page is stated as product weight, with the elemental zinc it delivers shown beside it. In solution, 1 gram of product dissolved in 1 liter of final solution supplies 140 mg/L of zinc.
Best uses & benefits
Choose this product when a soil or tissue test points to zinc in one of these situations.
Preventing zinc deficiency with a soil application
The manufacturer’s label recommends this chelate for use on all types of soil and states that its preferred use is as a soil application to prevent deficiency. It lists vegetable, field, tree, vine, ornamental, and turf uses, applied broadcast, under the drip line, or through drip, sprinkler, or furrow irrigation.
Foliar correction of a deficiency you can see
The label gives foliar sprays for correction when soil application is impractical, with per-acre rates, minimum spray volumes, and timing for vegetable, field, tree, vine, citrus, and turf uses. University of Minnesota Extension and University of Florida IFAS both give foliar chelated-zinc examples that fall inside the label’s range. A spray treats only the leaves it reaches.
Zinc-responsive crops and deficiency-prone ground
University of Minnesota Extension lists apple, dry edible beans, corn, onion, snap bean, and sweet corn as crops with a large response to zinc, and grape, lettuce, potato, soybean, and tomato as moderate. It reports deficiency on sandy and highly leached acid soils, low-organic-matter mineral soils, graded or eroded ground, soils with free calcium carbonate, and in cool early-spring soil.
The zinc line in a hydroponic or fertigation recipe
A single-nutrient, water-soluble zinc source for a complete nutrient program, dosed by weight to the zinc concentration your recipe specifies. Most complete hydroponic fertilizers already supply zinc, so account for it before adding more.
Where it is a poor fit
- Symptoms that have not been diagnosed. Zinc, manganese, and iron deficiencies can all show as yellowing between the veins, and leaf position alone does not separate them, as explained under How it works. Test first.
- Soil that already tests adequate for zinc. University of Minnesota Extension expects a response only when the DTPA zinc soil test is low. Extra zinc does not fix yellowing that has another cause.
- Chelated zinc in the seed furrow for corn. University of Minnesota Extension states that current research does not support the widespread use of chelated zinc applied in furrow for corn.
- Concentrated spot or band applications made at a broadcast rate. The manufacturer warns that using broadcast rates for spot or banded applications may cause phytotoxicity.
- Large soil-building programs. University of Minnesota Extension reports that all zinc sources except granular zinc oxide have an equal effect on crop production. Where a soil test calls for several pounds of zinc per acre, Zinc Sulfate supplies about 2.5 times as much zinc per pound.
- Home lawns treated by the label’s turf directions. The manufacturer marks its turf rates for professional use only. They are shown under Application rates & directions for professional applicators, not as a homeowner lawn program.
- A complete fertilizer or a pH fix. This product supplies zinc only. It does not lower soil pH, and a crop short of nitrogen, phosphate, or potash will not respond to it.
Application rates & directions
Every rate below is product weight unless the label prints a volume. The direction set comes from the manufacturer’s label for this 14% zinc EDTA, meaning the specimen label for this exact analysis, held on file by Greenway Biotech. It carries soil and fertigation rates per acre with the label’s crop lists, a turf rate per 1,000 sq ft, an individual-tree rate per inch of trunk diameter, ornamental directions as printed, and foliar and aerial rates with spray volumes, timing, and pH buffering. University Extension context has its own heading, and every source is listed under Product documents & sources. Confirm zinc deficiency before applying any of these.
Weigh it. This product’s density has not been measured, so no gram equivalent is given for the tablespoon measures the manufacturer prints for ornamentals; use those measures as printed. Everything else is weighed: use a scale reading to 0.1 g for garden, tree, and reservoir amounts, and pounds on a larger scale for field, orchard, and turf blocks.
Manufacturer directions: soil and fertigation
| Crop group (as listed on the label) | Label rate | Per 1,000 sq ft | Elemental zinc per acre | Method |
|---|---|---|---|---|
| Vegetable crops: beans, peas, potatoes, sweet corn, tomatoes | 4–12 lb per acre | 1.47–4.41 oz (41.7–125 g) | 0.56–1.68 lb Zn | For uniform coverage, dissolve in water or fluid fertilizer, or dry-blend with water-soluble fertilizers. Or dissolve and meter into drip, sprinkler, or furrow irrigation |
| Field crops: corn, dry beans, sorghum, sugar beets, sugarcane | 4–12 lb per acre | 1.47–4.41 oz (41.7–125 g) | 0.56–1.68 lb Zn | Same |
| Tree and vine crops: almond, apple, apricot, avocado, berry, cherry, citrus, grape, mango, olive, pear, peach, pistachio, plum, walnut | 4–15 lb per acre, or ½–2 oz per inch of tree diameter for individual trees | 1.47–5.51 oz (41.7–156 g) | 0.56–2.10 lb Zn | Per acre for a planted block. For individual trees, blend the weighed amount with an inert such as soil or sand, or sprinkle it directly and uniformly on the soil under the drip line, then water in |
| Ornamental shrubs and trees: azaleas, gardenias, junipers, pines, roses | 2 tbsp for small shrubs, up to 2 tbsp per inch of tree diameter for large trees and shrubs (volume as printed; no gram equivalent) | — | — | Under the drip line as for individual trees, then water in |
| Turf (professional use only) | ½ lb per 1,000 sq ft, or 22 lb per acre | 8 oz (227 g) | 3.05 lb Zn (3.08 lb at the label’s rounded 22 lb per acre) | Dissolve and apply uniformly, or meter into irrigation. Do not apply near water, storm drains, or drainage ditches, or if heavy rain is expected. Sweep product off pavement back onto the turf |
The manufacturer’s rates are for broadcast application, and its label warns that using them for spot or banded applications may cause phytotoxicity. Greenway’s condition on every rate here: start at the low end unless a soil or tissue test interpretation for the crop supports more. Measure the area actually treated, spread or meter the weighed amount uniformly, and water it in. Make one application per confirmed need rather than following a standing schedule, then reassess the crop before treating again.
Individual trees and vines: the per-inch direction
For a single tree or vine, the manufacturer’s label gives ½–2 oz of product per inch of trunk diameter (14–57 g per inch). Measure the trunk diameter, multiply, and start at ½ oz per inch unless the diagnosis supports more. Worked example: a 4-inch-diameter apple tree has a range of 2–8 oz (57–227 g) of product, delivering 7.9–31.8 g of zinc; begin at 2 oz. Sprinkle it uniformly on the soil under the drip line, or blend it with soil or sand first, keep it off the trunk, and water it in.
Which direction applies to which plant. The label prints two different directions that can both seem to fit a woody plant. Use the tablespoon direction for the ornamental species the label names: azaleas, gardenias, junipers, pines, and roses. Use the ½–2 oz per inch direction for the fruit, nut, and vine species in the tree and vine list. For a planted orchard or vineyard block, use the per-acre rate instead of the per-inch rate. Do not add two directions together.
Manufacturer directions: foliar and aerial application
| Crop group | Label rate | Spray volume | Timing and conditions |
|---|---|---|---|
| Vegetable and field crops, ground equipment | ⅓–1⅓ lb per acre (151–605 g) | Enough for thorough coverage, 25 gal per acre minimum | When soil application is impractical |
| Tree and vine crops, excluding citrus | 1–2 lb per acre (454–907 g) | Enough for thorough coverage, 25 gal per acre minimum | At dormant or delayed dormant before bloom, then after full bloom at 2–3 week intervals as needed |
| Deciduous crops with fruit present | 1 lb per acre (454 g) | 50–100 gal per acre | Reduced rate and higher spray volume while fruit is on the tree |
| Citrus | 1–2 lb per 100 gal of cover spray (4.5–9.1 g per gallon) | Full cover spray | Any time except during bloom |
| Turf (professional use only) | 1–4 oz per 1,000 sq ft (28–113 g); 1–3 oz (28–85 g) with growth regulators | Enough for thorough coverage | Water-protection restrictions as for soil use. Sweep product off pavement back onto the turf |
| Aerial application | ⅓ lb per acre (151 g) | At least 10 gal per acre | Follow the timing and frequency of the matching foliar direction |
For every foliar use, buffer the spray solution to pH 6–6.5 after diluting. Apply enough volume for thorough coverage; the label notes that wetting agents often enhance uptake. Do not spray plants that are suffering from moisture stress. The manufacturer permits application in water or in combination with most pesticides. When there is any doubt, spray a small test area of the crop first to check for undesirable effects. Start at the low end of a range. The citrus figure is a cover-spray concentration for citrus only. Every other foliar direction here is a weight per acre or per 1,000 sq ft, and none of them should be converted into a general per-gallon mixing rate for another crop. These are the manufacturer’s directions for this exact analysis; they do not transfer to zinc sulfate or any other zinc product.
What university Extension adds
University Extension publications state zinc rates as elemental zinc, for any zinc source. Two foliar examples line up with the label. University of Minnesota Extension says a zinc chelate should supply 0.15 lb of zinc per acre in 20 gal of water per acre, which is about 1.07 lb of this product. University of Florida IFAS reports 0.10–0.14 lb of chelated zinc in 100 gal of water per acre as effective, which is about 0.71–1.0 lb of this product. Both fall inside the label’s ⅓–1⅓ lb per acre for vegetable and field crops.
Soil rates are different. University of Minnesota Extension’s soil-test-based rates for Minnesota go up to 2 lb of zinc per acre banded and 10 lb broadcast, well above the 0.56–1.68 lb of zinc that the label’s vegetable and field rate delivers. Those rates were written for any zinc source, and Minnesota also reports that all sources except granular zinc oxide perform equally. This page does not turn them into directions for this product: follow the label rate here, or, where your own soil test interpretation calls for a larger soil-building application, use Zinc Sulfate and its directions.
Container and houseplants
No weighed container rate has been verified for this product. The manufacturer’s label covers field, orchard, turf, and landscape uses only, and its ornamental directions are volumes with no measured density behind them. To treat containers, dose by solution instead: use the reservoir method below at the zinc concentration your feeding program specifies, and apply enough solution to wet the whole root ball. Email questions@greenwaybiotech.com with your plant, pot size, and current feeding program and we will work it out with you.
Hydroponic and fertigation solutions
The manufacturer’s label covers fertigation as a way to deliver the soil rates above through irrigation. It gives no target concentration for a recirculating hydroponic reservoir, and no single zinc concentration fits every crop and recipe, so this page does not pick one for you. For example, University of Florida IFAS formulates hydroponic tomato solutions at 0.3 mg/L zinc across all growth stages, at a solution pH of 5.8–6.2; your recipe may differ. Take the zinc target from your complete recipe and subtract the zinc your base fertilizer already supplies. If you have a source-water analysis, subtract any zinc it reports, and dose the difference. An EC or TDS meter measures total dissolved salts and cannot tell you the zinc concentration.
Dosing by weight. Product (g) = additional zinc needed (mg/L) × final solution volume (L) ÷ 140. One gram of product in one liter supplies 140 mg/L of zinc, so 2.70 g raises 100 US gal (378.5 L) by 1 mg/L. Dissolve the weighed amount in water first and add it to a dilute, compatible solution. No maximum stock concentration has been verified for this product. Mix injector stocks well below saturation, stir until the solution is completely clear with no undissolved particles, and screen the stock before it reaches the injector.
Worked example: a 100 US gal reservoir (378.5 L), recipe target 0.3 mg/L Zn, with none supplied by the base fertilizer. Zinc needed = 0.3 mg/L × 378.5 L = 114 mg, which is 114 ÷ 140 = 0.81 g of product. Small doses: when the calculated amount is under 1 g, as here, make a 10.0 g/L measuring stock. Weigh 10.0 g, dissolve it, and make it up to exactly 1,000 mL; each mL then holds 1.40 mg of zinc. Measure mL of stock = mg of zinc ÷ 1.40, so this example takes 81 mL, measured with graduated equipment, not spoons. Label the stock and keep it secured.
How to use Chelated Zinc EDTA
- Diagnose first. Use a DTPA zinc soil test or a plant tissue test; University of Minnesota Extension considers a response likely when DTPA zinc is 0.5 ppm or less and possible up to 0.75 ppm. Note the conditions that favor deficiency: sandy, low-organic-matter, graded, calcareous, or high-pH soils, and cool early-spring soil.
- Choose the exact crop and method. Pick the manufacturer’s row for your crop group and method: broadcast or fertigation by acre, turf by 1,000 sq ft, individual trees by trunk diameter, ornamentals by the printed tablespoon direction, or a foliar spray by acre, by 1,000 sq ft of turf, or by gallons of citrus cover spray. Do not transfer a broadcast rate to a spot, band, or foliar application.
- Measure, then weigh. Record the area actually treated, the trunk diameter of each tree, the spray volume, or the reservoir volume and the zinc already in it. The calculator applies the documented rate; weigh the result on a scale.
- Apply uniformly. Soil: dissolve in water or fluid fertilizer, or dry-blend with a water-soluble fertilizer. Spread or meter it evenly over the measured area and water it in; for individual trees, apply it under the drip line. On a small bed, do not try to broadcast a few grams of dry powder. Instead, dissolve the weighed amount completely in enough water to wet the measured area evenly, apply that solution, then water in with plain water. Foliar: dissolve in the full spray volume, buffer to pH 6–6.5, and cover thoroughly; do not spray moisture-stressed plants. Reservoirs: dissolve first, then add to the dilute solution.
- Monitor before repeating. Judge the result on new growth. Reassess the crop, ideally with a follow-up tissue test, before any second soil application, and repeat foliar sprays only at the label interval as needed.
Calculator & choosing a size
Formulas. Square feet ÷ 43,560 = acres; multiply pounds by 453.6 for grams.
- Soil by area: product (lb) = acres × 4–12 lb for vegetable and field crops, or 4–15 lb for tree and vine blocks.
- Turf (professional use only): product (lb) = square feet ÷ 1,000 × ½.
- Individual trees or vines: product (oz) = trunk diameter (inches) × ½ to 2, per tree.
- Foliar by area: product (lb) = acres × ⅓–1⅓ lb for vegetable and field crops, 1–2 lb for trees and vines, 1 lb with fruit present, or ⅓ lb aerial. Use at least 25 gal of spray per acre (50–100 gal with fruit present; 10 gal aerial).
- Turf spray (professional use only): product (oz) = square feet ÷ 1,000 × 1 to 4, or 1 to 3 with growth regulators.
- Citrus cover spray: product (lb) = gallons of spray ÷ 100 × 1 to 2.
- Reservoir: product (g) = (recipe target − zinc already present, in mg/L) × final liters ÷ 140.
Worked examples. A 2,000 sq ft vegetable bed with confirmed zinc deficiency: 2,000 ÷ 43,560 × 4–12 lb = 0.18–0.55 lb, which is 83–250 g. Start at 83 g; a 1 lb bag covers it. One 4-inch apple tree: 4 × ½ to 2 oz = 2–8 oz (57–227 g); start at 2 oz, and a 1 lb bag covers it. A 100 gal reservoir at a 0.3 mg/L target with none already present: 0.3 × 378.5 ÷ 140 = 0.81 g, or 81 mL of a 10 g/L measuring stock.
The calculator below applies these directions and shows the full range, with the conservative end as the starting amount. It states the zinc delivered and, for sprays, the minimum spray volume. It then recommends the lowest-price bag combination that covers the starting amount for one application, plus the least-leftover combination when that differs. Prices, tax, and shipping are confirmed at checkout, and availability is confirmed when you add to cart.
The calculator needs JavaScript. If it does not appear, use the formulas and worked examples above to choose a size.
How zinc EDTA works
Zinc is a micronutrient: plants need it in small amounts, and a shortage limits growth and yield even when every other nutrient is adequate. Most soils contain zinc; the problem is how much of it plants can take up. University of Florida IFAS explains that zinc availability is closely tied to soil pH and that crops may be susceptible to deficiency above pH 7.3. University of Minnesota Extension adds sandy and highly leached acid soils, low-organic-matter mineral soils, ground where topsoil has been removed or eroded, soils with free calcium carbonate, and cool early-spring soil. It also notes that very high phosphate rates on calcareous soils above pH 8.3 can bring on deficiency.
A chelating agent such as EDTA holds the zinc ion in a soluble complex. IFAS describes chelated fertilizers generally as less reactive to soil conditions, and chelated zinc’s solubility is what makes it practical to meter through irrigation, dissolve in a foliar spray, or weigh into a nutrient solution. That is a handling advantage, not a guarantee of a larger crop response: University of Minnesota Extension reports that, in its research, all zinc sources except granular zinc oxide had an equal effect on crop production.
What deficiency looks like varies by crop. University of Minnesota Extension describes zinc-deficient corn as having broad bands of striped tissue on each side of the leaf midrib, showing first on the upper leaves, and zinc-deficient edible beans as yellowing on the lower leaves that turns bronze or brown as the season progresses. Colorado State University Extension, writing about woody landscape plants, says zinc and manganese deficiencies typically appear first on older, interior leaves, while iron chlorosis appears first on the younger, terminal leaves. Because the patterns differ by crop and overlap between nutrients, a soil or tissue test is the reliable way to confirm zinc. The evidence above concerns zinc nutrition generally; it is not a trial of this finished product.
Compare your options
Match the product to the nutrient your test identified and to the method you will use. Analyses are each product’s guarantee as shown on its page.
| Option | Nutrient | Choose it when | Limitation |
|---|---|---|---|
| Chelated Zinc EDTA 14% Zn, this product | 14.0% Zn, all chelated with EDTA | Confirmed zinc deficiency, where you want the manufacturer’s full soil, tree, turf, foliar, and aerial direction set, fertigation, or a weighed recipe line | Less zinc per pound than the sulfate; supplies zinc only; does not lower pH |
| Zinc Sulfate 35.5% Zn | 35.5% Zn and 16.5% S, unchelated | Soil-test-based soil applications that call for several pounds of zinc per acre, and where sulfur is wanted as well | Unchelated. Follow that product’s own directions; rates on this page do not transfer to it |
| Chelated Iron EDTA 13.2% Fe | Iron, not zinc | A tissue test identifies iron as the deficient nutrient | Supplies no zinc |
| Chelated Manganese EDTA 13% Mn | Manganese, not zinc | A tissue test identifies manganese as the deficient nutrient | Supplies no zinc |
Handling, storage & limitations
- Classification. This product is not classified as hazardous, and no signal word applies. Observe good industrial hygiene practices and wash your hands after handling.
- Protective equipment. Wear safety glasses with side shields, chemical-resistant gloves, and an impervious apron. Use respiratory protection if ventilation is not sufficient to keep dust down.
- Storage. Keep the container tightly closed, away from incompatible materials, and out of reach of children.
- Water, food, and feed. Do not apply near water, storm drains, or drainage ditches, or when heavy rain is expected. Sweep any product that lands on the driveway, sidewalk, or street back onto the treated area. Do not contaminate water, food, or feed by storage or disposal. Not for human or animal consumption.
- Application limits. Broadcast rates concentrated into spot or band applications may cause phytotoxicity. Do not spray moisture-stressed plants, and buffer foliar sprays to pH 6–6.5. Test a small area of the crop when in doubt. Turf directions are for professional use only. Make one soil application per confirmed need, then reassess.
- What it does not do. It supplies zinc only. It does not lower pH, correct root damage or waterlogging, fix an iron or manganese deficiency, or replace a complete fertilizer.
- First aid. Inhalation: move to fresh air, and call a physician if symptoms develop or persist. Skin: wash with soap and water. Eyes: rinse with water. Swallowed: rinse mouth, and get medical attention if symptoms occur. The 24-hour emergency number is CHEMTREC, 1-800-424-9300 (international +1-703-527-3887).
California Proposition 65. WARNING: This product can expose you to chemicals including arsenic, cadmium, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov/product.
Frequently asked questions
What is Chelated Zinc EDTA 14% Zn, and when should I choose it over zinc sulfate?
It is a water-soluble micronutrient fertilizer containing 14.0% zinc, all of it chelated by EDTA, for preventing and correcting zinc deficiency. Choose it when you want the manufacturer’s complete weighed direction set for this product, covering soil, individual trees, turf, foliar, and aerial use, or a chelated zinc line for fertigation or a hydroponic recipe. Zinc sulfate carries about 2.5 times as much zinc per pound (35.5%) and adds sulfur, and University of Minnesota Extension reports that all zinc sources except granular zinc oxide have an equal effect on crop production, so zinc sulfate suits larger soil-building applications. The rates on this page do not transfer between the two. Confirm the deficiency with a soil or tissue test before buying either.
What does zinc deficiency look like?
It depends on the crop. University of Minnesota Extension describes zinc-deficient corn as having broad bands of striped tissue on each side of the leaf midrib, starting on the upper leaves, and zinc-deficient edible beans as yellowing on the lower leaves that turns bronze or brown. Colorado State University Extension says that on woody landscape plants zinc and manganese deficiencies typically appear first on older, interior leaves, while iron chlorosis appears first on the youngest leaves. Because the patterns overlap between nutrients, confirm zinc with a DTPA zinc soil test or a plant tissue test before treating.
How much zinc EDTA should I apply to soil?
The manufacturer’s label for this 14% zinc EDTA gives 4–12 lb per acre for vegetable and field crops and 4–15 lb per acre for tree and vine crops. That is 1.47–4.41 oz (41.7–125 g) and 1.47–5.51 oz (41.7–156 g) per 1,000 sq ft. Dissolve it in water or fluid fertilizer, dry-blend it with a water-soluble fertilizer, or meter it through drip, sprinkler, or furrow irrigation. Spread it uniformly and water it in. Start at the low end and make one application per confirmed need. Do not concentrate a broadcast rate into a spot or band, because phytotoxicity may result. These are product-label directions, not university recommendations.
Why are university zinc rates higher than the label rate?
University Extension rates are stated as pounds of elemental zinc for any zinc source, and they are set by a soil test in a given region. University of Minnesota Extension’s rates for Minnesota go up to 2 lb of zinc per acre banded and 10 lb broadcast. The label rate for this product, 4–12 lb per acre on vegetable and field crops, delivers 0.56–1.68 lb of zinc. This page does not convert the university soil rates into directions for this product. Minnesota also reports that all zinc sources except granular zinc oxide perform equally, so where your soil test interpretation calls for a larger soil-building application, zinc sulfate supplies the zinc more efficiently per pound. The university foliar examples for chelated zinc, by contrast, fall inside the label’s foliar range.
How much should I use for one tree, shrub, or vine?
The manufacturer’s label gives ½–2 oz of product per inch of trunk diameter for an individual tree or vine in its fruit, nut, and vine list. A 4-inch-diameter tree has a range of 2–8 oz (57–227 g); begin at 2 oz unless the diagnosis supports more. Sprinkle it uniformly on the soil under the drip line, or blend it with soil or sand first, keep it off the trunk, and water it in. For the ornamental species the label names (azaleas, gardenias, junipers, pines, and roses), use the printed tablespoon direction instead: 2 tbsp for small shrubs and up to 2 tbsp per inch of tree diameter. Measure it as a volume, because no gram equivalent has been measured for this product. For a planted orchard or vineyard block, use the per-acre rate of 4–15 lb. Do not add two directions together.
Can I use zinc EDTA as a foliar spray?
Yes, on the crops the manufacturer lists. Its directions are ⅓–1⅓ lb per acre for vegetable and field crops and 1–2 lb per acre for tree and vine crops other than citrus, each in at least 25 gal of spray per acre. Deciduous crops with fruit present take 1 lb per acre in 50–100 gal, and citrus takes 1–2 lb per 100 gal of cover spray, any time except during bloom. By air, apply ⅓ lb per acre in at least 10 gal. Buffer the spray to pH 6–6.5, cover thoroughly, do not spray moisture-stressed plants, and test a small area of the crop when in doubt. University of Minnesota Extension’s chelated-zinc example, 0.15 lb of zinc per acre in 20 gal, works out to about 1.07 lb of this product, inside the label range. A spray treats only the leaves it reaches.
How much zinc EDTA do I mix per gallon of water?
It depends on the use, because the manufacturer’s label for this 14% zinc EDTA sets most rates by area, not by gallon. The only per-gallon direction is for citrus: 1–2 lb per 100 gal of cover spray (4.5–9.1 g per gallon), any time except during bloom. It is not a mixing rate for other plants. For other foliar uses, weigh the per-acre rate for your crop (⅓–1⅓ lb per acre for vegetable and field crops, 1–2 lb per acre for tree and vine crops other than citrus) and dissolve it in at least 25 gal of spray per acre; the calculator does both steps. For soil, weigh the rate for the area you are treating and dissolve it in enough water to wet that area evenly. For containers and reservoirs, dose to the zinc concentration your feeding program specifies: 1 g of product in 1 liter supplies 140 mg/L of zinc. Spoon measures are not converted to grams here, because a spoonful of this powder has not been weighed.
How much zinc EDTA do I add to a hydroponic reservoir?
Dose to the zinc concentration your recipe specifies, after subtracting what your base fertilizer and source water already supply; this page does not choose a target for you. Product in grams = additional zinc needed in mg/L × final liters ÷ 140, so 2.70 g raises 100 US gallons by 1 mg/L. For example, University of Florida IFAS formulates hydroponic tomatoes at 0.3 mg/L zinc, which in a 100 gal reservoir with none present takes 0.3 × 378.5 ÷ 140 = 0.81 g of product. Because that is under 1 g, use a 10 g/L measuring stock (1.40 mg of zinc per mL) and add 81 mL. Most complete hydroponic fertilizers already contain zinc, and an EC or TDS meter cannot measure it.
Can I use zinc EDTA on my lawn?
The manufacturer’s label carries turf directions of ½ lb per 1,000 sq ft (22 lb per acre) to the soil, and sprays of 1–4 oz per 1,000 sq ft, or 1–3 oz with growth regulators. It marks all of them for professional use only. It also restricts application near water, storm drains, and drainage ditches or when heavy rain is expected, and directs that any product on pavement be swept back onto the turf. This page reproduces those directions for professional applicators and does not offer a separate homeowner lawn rate.
Is this product organic or registered as a pesticide?
Neither. EDTA is a synthetic chelating agent, and this product does not carry an OMRI listing or an organic input registration. Growers under certification should get product-specific approval from their certifier before use. It is sold for plant nutrition only, is not registered as a pesticide or fungicide, and does not control plant disease.
Related guides & articles
- Sulfate vs. Chelated Fertilizers: Key Differences and Garden Benefits: when zinc sulfate and zinc EDTA each make sense, by soil pH and application method.
- Why Are My Plant’s Leaves Turning Yellow? 8 Causes and How to Fix Them: how to separate a micronutrient shortage from overwatering, pH, and the other common causes before you treat.
- What’s the Function of Zinc (Zn) in Plants?: background on why plants need zinc.
Articles give background. For this product, use the directions and documents on this page.
Product documents & sources
- Safety Data Sheet (PDF): hazard classification, handling, storage, first aid, and the California Proposition 65 statement.
- Product label: available on request. It shows the guaranteed analysis for this product. For the weighed direction set, see Application rates & directions, and ask us about any difference before applying.
Where the rates and statements on this page come from
The soil, fertigation, turf, individual-tree, ornamental, foliar, and aerial directions come from the manufacturer’s label for this same 14% zinc EDTA. The statements on zinc availability, deficiency conditions and symptoms, responsive crops, soil-test levels, zinc sources, university rates, and nutrient-solution dosing come from the university Extension publications below. They are listed for growers, advisors, and certifiers who want to check them. The Extension sources explain nutrient management; they do not certify or endorse this product.
- Manufacturer’s specimen label for this 14% zinc EDTA (form dated 2018), on file with Greenway Biotech: the direction set reproduced under Application rates & directions.
- University of Minnesota Extension, Zinc for Crop Production: responsive crops, deficiency-prone soils and conditions, symptoms in corn and beans, DTPA soil-test levels, the equal effect of zinc sources, chelated zinc in furrow for corn, and soil and foliar zinc rates.
- University of Florida IFAS, Understanding and Applying Chelated Fertilizers Effectively Based on Soil pH (HS1208): zinc availability and soil pH above 7.3, chelated fertilizers as less reactive to soil conditions, and the 0.10–0.14 lb chelated zinc foliar example.
- Colorado State University Extension, CMG GardenNotes 223, Iron Chlorosis of Woody Plants (PDF): zinc and manganese deficiencies appearing first on older, interior leaves of woody plants, and iron chlorosis on younger leaves.
- University of Florida IFAS, Nutrient Solution Formulation for Hydroponic (Perlite, Rockwool, NFT) Tomatoes in Florida (CV216): the 0.3 mg/L zinc example and solution pH used to illustrate recipe-based reservoir dosing.
Rates and sources reviewed September 26, 2026.
Help choosing & next step
Not sure whether zinc is the problem, or whether chelated zinc or zinc sulfate suits your soil test? Email your crop, test results, soil type, acreage or tree diameters, spray volume, and intended method to questions@greenwaybiotech.com. Or call (562) 351-5168, Monday to Friday, 7 AM to 5 PM Pacific, and we will work through it with you.
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Every order carries a 90-day satisfaction guarantee, and we pack and ship from Madera, California. You can also choose a package weight from the size selector at the top of this page. Have your crop, growing method, test results, and treatment area, tree diameters, spray volume, or reservoir volume ready.
Greenway Biotech, Inc. is a family-owned fertilizer company in Madera, California, blending and packaging specialty fertilizers and soil amendments since 1989.
