Calcium is one of the most prone secondary element deficiencies in hydroponic crops, and also the nutrient element most likely to cause precipitation problems. In soilless culture nutrient solutions, calcium easily reacts with phosphate and sulfate to form insoluble precipitates, which not only cannot be absorbed by crops, but also block drip irrigation pipes and adhere to root surfaces causing root rot. EDTA chelated calcium is the optimal solution to this problem.

Ordinary calcium nitrate has poor stability in hydroponic nutrient solutions. When the pH of the nutrient solution exceeds 6.0, calcium ions begin to react with phosphate to form precipitates. EDTA chelated calcium exists in a stable chelated state, and will not dissociate or precipitate in a wide pH range of 4.0-9.0, always maintaining an active state that can be directly absorbed by roots.

EDTA chelated calcium has excellent water solubility, fast dissolution speed and no residue, adapting to various hydroponic modes such as NFT, DFT and substrate cultivation. The conventional application concentration is 50-100mg calcium per liter of nutrient solution. Leaf vegetables can take the lower limit, while solanaceous fruits and fruit tree seedlings can take the medium to high limit. In daily management, avoid mixing with high-concentration phosphate fertilizers at high concentration at the same time. They can be added separately or mixed after dilution.

In addition, EDTA calcium can stably coexist with other nutrients in the nutrient solution with little antagonism. It can continuously ensure crop cell wall synthesis, prevent calcium deficiency symptoms such as young leaf edge scorch, fruit blossom end rot and cracking, and maintain normal crop growth and fruit quality.