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%。
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 43%-45%,37%-41%,28%-29% and 14%-15% at tillering,panicle initiation,heading and maturing stage,respectively.
出处
《福建农业学报》
CAS
1998年第2期58-64,共7页
Fujian Journal of Agricultural Sciences
基金
农业部资助
关键词
杂交水稻
氮肥效率
氮素营养
诊断
Hybrid rice
Nitrogen fertilizer level
Utilization ratio of N
N nutrient diagnosis