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连续3年在甘蓝套玉米—甘蓝轮作制中进行增施钾肥定位试验,研究结果表明:钾肥对甘蓝玉米产量有显著的增产作用,对甘蓝的品质也有明显的改善,并随年限的增加钾肥对产量、Vc和糖含量效应进一步增大,施钾对春甘蓝的产量影响高于冬甘蓝。在同N水平下,产量有随钾用量的增加而增加趋势。连续2年施钾的后效对玉米产量增长极显著。施用钾肥可大幅度增加的总产值,氮钾配施肥料的产投比达3.27～4.56,其中处理N2K1高达4.56。综合分析表明:钾肥对粮菜轮作制中的产量和品质影响大于氮肥、在实际施肥中以高钾中氮为最佳。
The experiment of increasing potash fertilizer application in the cabbage-cabbage-cabbage rotation system for 3 consecutive years showed that potassium fertilizer significantly increased the yield of cabbage and significantly improved the quality of cabbage. With the increase of years, The effects of yield, Vc and sugar content were further increased. The effect of potassium application on the yield of spring cabbage was higher than that of winter cabbage. At the same N level, the yield increased with the increase of K content. After two consecutive years of potassium application efficiency of corn yield is extremely significant. Application of potash fertilizer can greatly increase the total output value, nitrogen and potassium fertilizer and fertilizer production and investment ratio of 3.27 ~ 4.56, which deal with up to 4.56 N2K1. The comprehensive analysis shows that the effect of potash fertilizer on yield and quality of grain and grain rotation is greater than that of nitrogen fertilizer, and high potassium and medium nitrogen are the best in actual fertilization.