How to apply calcium fertilizer in shed vegetables

Reasonably choose the pH value of the soil in the calcium fertilizer shed, which is mostly 6.5-7.5. Alkaline substances or neutral fertilizers, such as slaked lime and calcium nitrate, should be used, and acidic or physiologically acidic substances should be used less. Ordinary phosphate fertilizers such as superphosphate, calcium-magnesium phosphate, and heavy superphosphate are important sources of calcium fertilizer. Bone meal and plant ash contain a certain amount of calcium, which are also calcium sources that cannot be ignored and can be selected according to the situation.

In order to prevent calcium deficiency in the early stage of vegetable growth, basal calcium fertilizer can be used. In sheds that have been planted for many years, 2000 to 3000 kilograms of decomposed organic fertilizer are generally applied per mu, and 30 to 45 kilograms of superphosphate are added.

Scientifically fertilize vegetable greenhouses with a heavier soil acidity. The method of reapplying base fertilizer is often used, that is, 100 kg of plant ash or 50 kg of slaked lime per acre. The specific method is to mix organic fertilizer with slaked lime or plant ash and apply it evenly to the ground surface , Plowing into the ground. For growing vegetables, especially in the vigorous growth period, top dressing can be used to supplement calcium nutrition, generally 40-60 kg of hydrated lime per acre, and the amount of lime in sandy soil is appropriately reduced. You can also uncover one end of the film with 80 kg of slaked lime or 50 kg of plant ash, open a 10 cm deep ditch, topdress the fertilizer on the bottom of the ditch, water it, and cover it with soil after the water seeps in. It can also be combined with disease-preventing sprays, and calcium supplementation is used as a foliar top dressing. The concentration of top dressing is generally 0.3% to 0.5%. Generally, 0.1% to 0.2% calcium nitrate or 1% superphosphate can be sprayed, spraying once every 15 days, and spraying 3 to 4 times continuously, the effect is better.

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