不同施钾水平对玉米干物质及产量的影响

试验研究了不同施钾水平对玉米干物质及产量的影响。结果表明,玉米叶、鞘干物质重与施用钾肥有关,在子粒灌浆期达到最大值,蜡熟期叶、鞘干物质重均呈下降趋势;茎秆和地上干物质总重量与钾肥水平有关,干重随生育进程推进而增加;钾肥用量在0～180 kg/hm2水平内,玉米产量随钾肥用量增加而提高,当钾肥用量达240kg/hm2水平时玉米产量则下降。在试验土壤肥力条件下,180 kg/hm2施钾肥水平玉米产量最高。

Effect on Dry Substantial Accumulations and Yield of Maize in Different K Fertilizer Levels

The experiment researched the effect on dry substantial accumulations and yields of maize in different K fertilizer levels.The result proved that dry substantial weights were relative to K fertilizer in the leaves and sheaths of maize,it achieved the maximum in the grouting stage,and it had the descend current in the mature stage.The total dry substantial weights were relative to K fertilizer in the stems and overground parts of maize,and it increased with growing stage.The yield of maize increased in 0-180 kg/ha K fertilizer level,and it descended in 240 kg/ha K fertilizer level.The yield of maize were the highest in 180 kg/ha K fertilizer level under the experimentative conditions of soil fertility.