The Effect of Nitrogen on Grain Yield of Hydrid Rice
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摘要: 历经3a设置不同施N水平试验,结果表明:杂交稻的吸N量随施N水平的提高而呈曲线增加,但N肥回收率和生产干物质及稻谷的效率随施N水平的提高而降低。干物质积累量、稻谷产量与施N量呈抛物线型相关。试点施N130～144kg/hm2可保持较高的N肥回收率和生产效率,取得最高的产量和经济效益。提出杂交稻主要生育期叶片含N率的高产诊断指标为分蘖期4.3%～4.5%,苞分化期3.7%～4.1%,齐穗期2.8%～2.9%,黄熟期1.4%～1.5%。Abstract: The experiment was conducted in Longhai,Fujian,China during 1991-1993.Results showed that the relationship between nitrogen absorbed by rice plant and amount of nitrogen fertilizer applied appeared as a curve;The nitrogen use efficiency of rice plant was decreased when the amount of nitrogen applied increased;However,both of the accumulation of dry weight and grain yield of hybrid rice showed as parabola related to the rate of nitrogen applied;The optimum rate of nitrogen for hybrid rice in Longhai was about 130-144 kg N/hm2;The nitrogen contain in leaf at different growing stages was an important index for obtaining higher grain yield of hybrid rice.Those indexes were 4.3%-4.5%,3.7%-4.1%,2.8%-2.9% and 1.4%-1.5% at tillering,panicle initiation,heading and maturing stage,respectively.
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Key words:
- Hybrid rice /
- Nitrogen fertilizer level /
- Utilization ratio of N /
- N nutrient diagnosis
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