Fertilization technology for pollution-free leafy vegetables

Mainly organic fertilizer, focus on the bottom fertilizer, reasonable topdressing, control the amount of nitrogen fertilizer, promote the use of special fertilizers and biological fertilizers, prohibit the use of nitrate nitrogen fertilizer, soil testing formula, maintain soil fertility balance.

Apply sufficient base fertilizer: ensure that the organic fertilizer is 4,000-5000 kg/mu, the diammonium phosphate is 30-40 kg/mu, the potassium sulfate is 30-40 kg/mu or the three-element compound fertilizer is 80 kg/mu.

Reasonable topdressing: Applying slow-acting fertilizers in the early and middle stages, it can be applied to fully decomposed human excrement 1000 kg/mu and grass ash 40-100 kg/mu or three-element compound fertilizer (or urea) 10 kg/mu; Apply quick-acting ammonium bicarbonate 20~30kg/mu or urea 10kg/mu.

It is forbidden to apply harmful urban garbage and sludge, and it is not allowed to use manure water for top dressing during the harvesting stage.