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采用两因素裂区设计,在典型的红壤稻田研究施氮量和直播量对超级杂交稻五丰优T025群体茎蘖动态、产量和养分吸收利用的影响。结果表明,不同施氮量处理对五丰优T025的群体分蘖数和有效穗影响较小,但不同直播量处理间的群体分蘖数和有效穗差异显著。随着播种量增加,有效穗和产量相应增加,以施氮量180 kg/hm~2、播种量37.5 kg/hm~2的处理组合产量最高,达10.65 t/hm~2。施氮有利于五丰优T025对氮、磷、钾的吸收,但随施氮量的增加,氮磷钾收获指数和氮肥利用率降低。合理增加直播量、减少施氮量可保证五丰优T025的产量,同时提高其氮肥利用率。
A two-factor fracturing design was used to study the effects of nitrogen and direct seeding rates on tillering dynamics, yield and nutrient uptake of super hybrid rice, Wufengyou T025, in a typical red paddy field. The results showed that the effects of different nitrogen application rates on the tillering number and effective panicles of Wufengyou T025 were small, but there was significant difference between the tillers and effective panicles in different direct seeding treatments. With the increase of seeding rate, the effective spike and yield increased correspondingly, with the highest yield of 10.65 t / hm ~ 2 with the rate of nitrogen application of 180 kg / hm ~ 2 and seeding rate of 37.5 kg / hm ~ 2. Nitrogen fertilization was favorable to N, P and K uptake by Nifuyou T025, but with the increase of N application rate, NPK harvest index and N use efficiency decreased. Reasonably increasing the amount of direct seeding and reducing the amount of nitrogen application can ensure the yield of Wufengyou T025 and at the same time increase the utilization rate of nitrogen fertilizer.