关键词: 大白菜, 产量, 水肥耦合, 正交旋转组合设计

Abstract: 【Objective】 Study on the effects of water and nitrogen (N), phosphorus (P) and potassium (K) fertilizer combined application on Chinese cabbage yield. 【Method】 Quadratic orthogonal regressive rotation design with four factors was used with “Early Maturing Chinese Cabbage No. Five” as the experimental material in a pot experiment. A regression model on water and fertilizers and Chinese cabbage yield was established,and the effects of single factor and multiple factors were analyzed. 【Result】 Treatment 14 ( irrigation amount：70% W; N fertilizer rate： 0.185 g/kg; P fertilizer rate： 0.095 g/kg; K fertilizer rate： 0.240 g/kg) had the highest yield of 1.52 kg per plant,while treatment 9 ( irrigation amount： 40% W;K fertilizer rate：0.185 g/kg; P fertilizer rate：0.095 g/kg;K fertilizer rate：0.240 g/kg) had the lowest yield of 0.26 kg per plant. The main effects of four experimental factors on the Chinese cabbage yield were ordered by irrigation amount>N rate>K rate> P rate,and the interaction effects between irrigation amount and N fertilizer, P fertilizer or K fertilizer rates were presented positive correlation. 【Conclusion】The results showed that applying water and fertilizers of N, P and K too much or too little was not conducive to the increase of Chinese cabbage yield, and proper application of water and fertilizers of N, P and K could raise Chinese cabbage yield remarkably. The highest theoretic yield of Chinese cabbage was 1.52 kg per plant when irrigation amount was 84.34% and N,P and K fertilizer rates were 0.307 g/kg,0.115 g/kg and 0.286 g/kg respectively under the condition of pot experiment.

Key words: Chinese cabbage, yield, application of water and fertilizers, quadratic orthogonal regressive rotation design