砂姜黑土上氮钾配施对粮菜轮作中产量与品质的影响

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。

N-K Combination Fertilization Effect on Yield and Quality in Grain-vegetable Rotation System on Shajiang Black Meadow Soil Area

Three years' continuous fixed position experiment on the effect of K application on wild cabbage interplanting corn-wild cabbage rotation system was conducted.The results indicated that the K fertilizer application could notably increase the wild cabbage and corn yield,marked improve the wild cabbage quality such as Vc and carbohydrate,and make further improvement on the yield and quality along with the experiment year.The effect of K fertilizer application on the yield of spring wild cabbage was higher than that of winter wild cabbage.In the same N fertilizer lever,the yield increased along with the K fertilizer applying quantity.Two years K fertilizer application had the notably follow-up effect on increasing of the corn yield.K fertilizer application could increase the total output value by a big margin,the value to cost ratio(VCR) could then be 3.27-4.56 for the treatment of N-K fertilizer combination fertilization,and the treatment of N_2K_1 had the highest VCR,the value was 4.56.Synthetically analysis showed that the effect of K fertilizer on yield and quality on grain-vegetable rotation system was better than that of N fertilizer.It was the scientific method that we confirmed high K and middle N lever in the course of actual fertilizer application.