Chelated Calcium EDTA 10% – Uses, Dosage & Application

Chelated Calcium EDTA 10% is a fully water-soluble, chelated secondary-nutrient fertilizer registered for use in India under the Fertilizer (Control) Order, 1985 (FCO) — a plant-nutrition product, not a crop-protection one. Calcium is essential for cell wall strength and structure, and unlike more mobile nutrients, it moves poorly within the plant once absorbed, so deficiency shows up specifically in the youngest growing tissue and in the developing fruit itself, even when soil calcium levels are adequate. Dosage guidance on this page draws on ICAR and state agricultural university research on calcium-deficiency physiological disorders in fruiting and vegetable crops, read alongside the product's own FCO label application rate for this chelated formulation.

Which Deficiency Symptom Is This For? (Symptom Guide)

Not sure whether what you're seeing in the field is calcium deficiency? This guide helps match the visible symptom to the crop before deciding on a spray.

Mode of Action

Calcium EDTA is a chelated form of calcium in which the calcium ion is bound within an EDTA (ethylenediaminetetraacetic acid) molecule, keeping it soluble and readily absorbable by the leaf when sprayed. Calcium is a structural component of the cell wall (as calcium pectate) and plays a role in cell membrane stability and cell division; because it moves almost entirely through the plant's xylem (water-conducting tissue, driven by transpiration) rather than being redistributed through the phloem, calcium supplied to older leaves does not reach fast-growing new tissue or fruit — deficiency symptoms are therefore localised to the youngest leaves and the fruit itself, and are corrected only by getting calcium directly to those tissues via a targeted, repeated foliar spray rather than a single soil application.

Features & Benefits

• Fully water-soluble, chelated calcium source that reaches the fruit and young leaf tissue directly through foliar spray, where soil-applied calcium often cannot.
• Corrects blossom end rot in tomato and capsicum/chilli, tip burn in cabbage/cauliflower, bitter pit in apple and pod-filling disorders in groundnut.
• Chelation keeps calcium available for foliar uptake without the antagonism/precipitation problems calcium salts can have with phosphates and sulphates.
• Improves fruit firmness, shelf life and post-harvest storage quality alongside correcting the physiological disorder itself.
• Compatible with most common fertilizers and crop-protection products in a tank mix (a jar-compatibility test is still recommended before mixing, especially with sulphate or phosphate fertilizers).

Recommended Usage of Chelated Calcium EDTA 10% Fertilizer

Because calcium deficiency disorders are corrected by direct, repeated foliar contact with the affected tissue rather than a single per-hectare soil dose, ICAR and university extension guidance for these crops is expressed as a foliar spray concentration with a repeat schedule through the fruiting/heading period, rather than a one-time application.

Doses above are expressed as a percentage/concentration rather than a per-acre quantity because chelated calcium foliar sprays are dosed by the concentration of the spray solution, not by land area, and because these disorders are corrected only by repeated, targeted contact with the affected tissue rather than a single soil dose. Always confirm the current product label before use and consult your local agricultural extension office for crop-specific guidance.

How to Use

1. Confirm calcium deficiency symptoms against the Symptom Guide above — these disorders appear on fruit or young leaf tissue specifically, not as general yellowing across the plant, which helps distinguish them in the field.
2. Dissolve the required quantity of Chelated Calcium EDTA 10% fully in a small amount of water first, then add it to the spray tank and top up to the required volume while stirring.
3. Spray using a knapsack or power sprayer fitted with a fine mist nozzle, directing coverage specifically at flower clusters, young fruit or the growing point, since calcium barely moves once it reaches older leaf tissue.
4. Spray during the early morning or late evening to reduce evaporation and improve uptake; avoid spraying in strong sunlight or just before rain.
5. Begin spraying preventively from flowering/early fruit-set in disorder-prone crops and weather (hot, dry spells or uneven watering) rather than waiting for symptoms to appear, and repeat at the interval given in the table above through the fruiting/heading period.

Precautions & Safety

• Wear basic protective clothing and gloves while mixing and spraying, as a routine precaution for any agricultural input.
• Do not exceed the recommended concentration — spraying calcium at a higher-than-labelled concentration can cause leaf or fruit-surface scorch rather than faster correction.
• Avoid tank-mixing with sulphate or phosphate fertilizers without a jar-compatibility test first, since calcium can react with them to form an insoluble precipitate that reduces effectiveness and can block sprayer nozzles.
• Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food, feed and out of reach of children and livestock.
• Calcium sprays correct the physiological disorder in the current crop but do not carry over to the next planting — repeat the spray programme each season in disorder-prone fields, alongside consistent irrigation to reduce moisture-stress triggers.
• Wash hands, face and any exposed skin thoroughly with soap and water after handling or spraying.

Brand names mentioned on this page are registered trademarks of their respective owners and are referenced here for identification purposes only; FarmMate is not affiliated with or endorsed by these brands. This page is for general information only — always consult your local agricultural extension office and confirm the current product label before use.