不同氮磷钾肥料配施比例对上海青生物量的影响

Effects of different NPK fertilizer application ratio on biomass of Brassica chinensis L.

【目的】研究上海青最优氮、磷、钾肥料配比。【方法】结合土壤养分含量的变化,采用"3414"肥料效应部分方案设计上海青施肥试验,比较了不同施肥处理下上海青生物量和土壤养分含量。【结果】N2P2K2的施肥方案下上海青鲜重和氮、磷、钾含量均高于其他处理,且有利于维持土壤营养结构并防止土壤碱化,确定了N2P2K2的施肥方案效果较好。【结论】在此基础上以P2K2水平为基础开展氮肥效益曲线拟合,修正上海青最优施肥方案为2.373∶2∶2,此时可食部分鲜重和上海青氮、磷、钾含量均靠近极大值点,收益最高。

【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.