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以杂交早稻两优302为试验材料,研究了不同施氮量对早稻免耕抛秧和翻耕抛秧生育特点及产量的影响。结果表明,施氮量对免耕抛秧和翻耕抛秧影响趋势相同,随着施氮量的增加,高峰苗和叶面积系数增加,成穗率降低;当施氮量为180 kg/hm2时,有效穗数和每穗粒数最多;随着施氮量的增加,结实率和千粒重呈下降趋势;施氮量和产量之间呈抛物线关系,以施氮量为180 kg/hm2的产量最高。
Using the hybrid rice Liangyou 302 as experimental material, the effects of different nitrogen rates on the characteristics and yield of no-tillage and seedling-throwing and tillage and seedling throwing were studied. The results showed that the effect of nitrogen application rate on no-tillage and seedling-throwing was the same. With the increase of nitrogen application rate, the peak seedling and leaf area coefficient increased and the percentage of ear became lower. When the nitrogen application rate was 180 kg / hm2 , The number of panicles per panicle and the number of panicles per panicle were the most. With the increase of nitrogen application rate, the seed setting rate and 1000-grain weight tended to decrease. The yield of nitrogen fertilizer was parabolic with yield of 180 kg / hm2 highest.