不同氮磷钾施用量对杂交粳稻产量的影响

Study on the Effect of Amounts of Nitrogen,Phosphorus and Potassium on Yields of Japonica Hybrid Rice

通过进行不同氮磷钾肥施用量对杂交粳稻产量及其构成因素影响的研究,结果表明:辽优5218和辽优5238在高氮量处理区能明显提高成穗率,中氮量和高氮量之间对辽优5238成穗数影响差异不大;辽优5238分蘖速率对于磷肥用量的增加并不敏感;辽优5218在高磷量下前期分蘖加快,有效分蘖率下降;过高或过低钾肥用量对辽优5218分蘖没有明显促进作用;辽优5218在高氮高磷和中钾肥量的条件下,产量明显高于其他处理,而辽优5238则可以在低氮、低磷、低钾条件下获得较高产量。

Through the study on the effect of different amounts of nitrogen, phosphorus and potassium on yields of japonica hybrid rice, the result showed that Liaoyou5218 and Liaoyou5238 had higher productive tiller rate under high application amount of nitrogen. There was no significant difference in productive tiller rate between moderate and high amount of nitrogen for Liaoyou5238. Liaoyou5218 tillered fast at early growth stage with high phosphorus amount, but its productive tillers rate decreased. The tillering rate was not increased significantly with the increase of phosphorus amount for Liaoyou5238. Over or less application of potassium was not helpful to increase tillers for Liaoyou5218.Yields of Liaoyou5218 with high amount of nitrogen and phosphorus and moderate amount of potassium were higher than other treatments, but Liaoyou5238 could reach high yield in conditions of lower nitrogen, phosphorus and potassium.