Abstract:

In order to understand the effect of phosphorus and potassium reduction in vegetable fields rich in phosphorus and potassium, the plots with 378 mg/kg available P and 614 mg/kg available K were selected to carry out nine different nitrogen, phosphorus and potassium reduction treatments for three consecutive crops. The results showed that reducing the amount of nitrogen, phosphorus and potassium fertilizer could reduce the contents of the corresponding nutrient elements in vegetables. Reducing the input of phosphorus and potassium fertilizer could effectively reduce the levels of available phosphorus and available potassium in soil. No or less application of phosphorus and potassium had no obvious effect on vegetable yield, but no application of nitrogen could significantly reduce vegetable yield. The vegetable yield of organic fertilizer replacing phosphate and potassium fertilizer was higher than that of conventional fertilization. Nitrogen was the main nutrient element that restricted the growth of vegetables. No or less application of phosphorus and potassium fertilizer in the short term could effectively reduce the accumulation of phosphorus and potassium in soil and reduce the risk of phosphorus loss while keeping the yield from decreasing.

Key words: facility vegetables, enrichment of phosphorus and potassium, vegetable production, soil nutrients, reduced fertilizer, organic fertilizer, nutrient management