Soil testing and Formula fertilization technique for Chinese Cabbage

Chinese cabbage has a long growth period, high yield, great demand for nutrients and the largest absorption of potassium, followed by nitrogen, calcium, phosphorus and magnesium.

Characteristics of fertilizer requirement:

Chinese cabbage has a long growth period, high yield, great demand for nutrients and the largest absorption of potassium, followed by nitrogen, calcium, phosphorus and magnesium. The general characteristics of fertilizer requirement were as follows: the absorption of nutrients was less in the seedling stage, increased significantly in the rosette stage, and the highest in the pericardium stage. Adequate nitrogen nutrition is of great significance to promote the formation of hypertrophic green leaves and improve photosynthetic efficiency. If the supply of phosphorus and potassium is insufficient in the later stage, it is often not easy to form balls.

Fertilization technology:

Under the medium fertility level, the amount of fertilizer applied per mu is 2000,2500kg of farm manure (or 300,350kg of commercial organic fertilizer), 1316kg of nitrogen fertilizer, 5kg of phosphate fertilizer and 1012kg of potash fertilizer. All phosphate fertilizer is used as base fertilizer and mixed application of chemical fertilizer and farm fertilizer (or commercial organic fertilizer).

Base fertilizer: 2000kg / mu farm manure or 300kg / mu commercial organic fertilizer, 4kg urea, 11kg diammonium phosphate, 6kg potassium sulfate and 20kg calcium nitrate.

Topdressing: 1012kg urea and 79kg potassium sulfate per mu in rosette stage, 1012kg urea and 79kg potassium sulfate per mu in the early stage of Baoxin.

Extra-root topdressing: spraying 0.3% calcium chloride solution or 0.25%-0.50% calcium nitrate solution during the growing period can reduce the incidence of dry heartburn. Spraying 0.5% urea or 0.2% potassium dihydrogen phosphate solution at the initial stage of heading can increase the commercial value of Chinese cabbage.

Haus.