不同氮磷钾用量对潮土中产田玉米产量和肥料利用的影响

为提高中产田玉米的产量和肥料利用率,在河南省汤阴县潮土中产田进行了不同氮磷钾肥料试验。结果表明,玉米产量随施氮量增加而增加,其增产幅度在用量超过210kg/hm2后下降,氮肥农学效率以氮肥施用量210kg/hm2最高,为20.5kg/kg。磷肥在0～112.5kg/hm2用量范围内,玉米产量和磷肥农学效率随磷肥施用用量增加而增加,并在75kg/hm2用量时达到最高,产量较不施磷处理增加20.8%,农学效率为20.2kg/kg,之后开始降低。钾肥在0～112.5kg/hm2用量范围内,玉米产量随施钾量增加而增加,但钾肥农学效率则表现为相反的趋势。由此可见,在本试验条件下,汤阴县中产田玉米增产增效的氮磷钾最佳配比为N 210kg/hm2,P 75kg/hm2,K 37.5kg/hm2。

Effect of Various Levels of NPK on Corn Yield and Fertilizer Use Efficiency in Middle Yield Field of Alluvial Soil

A field experiment was conducted to check the corn yield and fertilizer use efficiency in the middle yield field of alluvial soil in Tangyin county.The results showed that the corn yield increased with the amount of nitrogen used,but corn yield decreased with the amount of nitrogen applied over 210 kg/ha.The highest nitrogen agronomic efficiency(20.5 kg/kg) was obtained in the treatment of 210 kg/ha.The corn yield and phosphate agronomic efficiency also increased with the amount of phosphate fertilizer used within 0-112.5 kg/ha,and reached the highest with the amount of 75 kg/ha,in which corn yield was 20.8% higher than the treatment of no phosphorus,with 20.2 kg/kg for phosphorus agronomic efficiency,while corn yield and P agronomic efficiency decreased with the amount of P applied over 75 kg/ha.The corn yield increased with the amount of potassium fertilizer used within 0-112.5 kg,but the opposite trend was observed for potassium agronomic efficiency.Therefore,N210P75K37.5 was recommended as optimal ratio of NPK for corn higher yield and higher efficiency in middle yield field of Tangyin county.