钾肥对玉米的增产增收效果与利用率

田间试验结果表明,钾对玉米有较显著的增产作用。以施用K₂O 50～100kg/hm²可以获得最大产量和最高收益。钾肥在风沙土上增产、增收效果好于淡黑钙土和黑土,在黑钙土上好于黑土。施钾量与玉米产量关系式为y=a+bx+cx²。土壤有效钾含量与施钾最大增产量呈极显著的直线负相关y=3491.5-23.00x。玉米施钾可提高植株和子粒含钾量和干物质产量,因而明显提高吸钾量。在中肥力黑土上施用100kg/hm²钾(K₂O)的利用率为37.56%。

Effect of K Application for Increasing Yield and Income And Its Uutilization Ratio on Corn

Experimental results showed that potash fertilizer significantly increased corn yield.The highest yields and benefits were achieved by appling 50-100kg/ha K 2O.Effects of yield increase on aeolian sandy soil were better than those on light chernozem soil and black soil,and thd yield increase effects on light chernoxem soil were better than thhose on black soil.Relative epuations between thd application amounts of potassium and yields was Y=a bX cX 2.Relation between content of available K in soil with the highest yield increase value of application of K were most signficantly negative Y=3491 5 23.00X.Applied potash fertilizer increased the content of potassium in plants and grains,and dry matter yields,therefore,sigficantly increased potassium uptake. The utilization ratio of potash fertilizer was 37.56% on thd black soil of medium level fertility.