不同施氮量对水稻产量及构成因素的影响

通过4种不同水平施氮量(0、112.5、225.0、337.5 kg/hm2)对10个不同水稻品种(系)进行产量及构成因素研究,结果表明:在磷、钾标准施用和土壤条件背景一致,10个品种(系)在4种施氮标准下,品种(系)产量整体表现出从0~112.5 kg/hm2逐渐升高,然后112.5~337.5 kg/hm2产量降低的过程。结实率表现为随着施氮量的增加而降低,有效穗则随着施氮量的增加而增加,千粒重无明显变化。同时,不同的品种对氮肥的敏感度不同。

Effects of Different Nitrogen Application Rates on Yield and Component Factors of Rice

The yield and component factors of 10 rice varieties were studied under 4 nitrogen fertilization level(0,112.5,225.0,337.5 kg/hm2).The results showed that under the same phosphorus,potassium fertilizer and soil conditions,the yields of 10 rice varieties under 4 nitrogen fertilization levels increased gradually as nitrogen fertilization level increased from 0 kg/hm2 to 112.5 kg/hm2,and then reduced as which increased from 112.5 kg/hm2 to 337.5 kg/hm2.The setting rate reduced along with the increase of nitrogen fertilization,the effective spikes increased of along with the increase of nitrogen fertilization,and the 1000-grain weight showed no significantly change.At the same time,the sensitivity to nitrogen fertilization varied from different rice varieties.