不同氮磷钾肥料配施比例对上海青生物量的影响.

【Objective】In order to study the optimal NPK ratio for Brassica chinensis L..【Methods】Part of “3414” fertilizer effect strategy was used to design Brassica chinensis L. fertilization experiment. Combined with the changes of soil nutrient composition,the biomass and soil nutrient content of Brassica chinensis L. were compared under different treatments. 【Results】The fresh weight and NPK content of Brassica chinensis L. Using N2P2K2 fertilization strategy were significantly higher than other treatments. This strategy was highly beneficial to maintain the soil nutrition structure and prevent soil alkalization. It was determined that the N2P2K2 fertilization strategy was better.【Conclusion】 On this basis,the optimal fertilization strategy for Brassica chinensis L. was revised to be 2.373∶2∶2 by curve fitting of nitrogen fertilizer effect on the P2K2 level. Using the optimal NPK ratio,the fresh weight and NPK content of Brassica chinensis L. were close to the maximum point,making the return the highest. [ABSTRACT FROM AUTHOR]