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以早籼15为材料,在总施氮量一致的情况下研究施氮比例对早稻干物质积累和分配的影响。结果表明:前后期施氮比例过高过低都不利于此期干物质积累,基肥施氮比例为40%~50%最利于拔节—抽穗期干物质的积累,施氮比例为5∶3∶2(基肥∶分蘖肥∶穗肥)最利于拔节—抽穗期干物质的积累,水稻的产量也最高;拔节—抽穗期基肥施氮量占总施氮量比例小于51.84%时,干物质积累量随施氮量的提高而增加;抽穗—成熟期基肥施氮量占总施氮量比例小于44.56%时,干物质积累量随施氮量的提高而增加。该试验条件下,基肥为40%~50%,分蘖肥为30%,穗肥为20%~30%较为适宜。
Taking Zaozhan 15 as material, the effects of N application rate on dry matter accumulation and distribution in early rice were studied under the same nitrogen application rate. The results showed that the high and low N rates were not conducive to the accumulation of dry matter in this period. The basal fertilizer application rate of 40% ~ 50% was the most favorable for the accumulation of dry matter at the jointing-heading stage with nitrogen application rate of 5: 3: 2 (basal fertilizer: tillering fertilizer: panicle fertilizer) was the most conducive to jointing-accumulation of dry matter at heading stage, and the yield of rice was also the highest. When the proportion of total nitrogen fertilizer was less than 51.84% at jointing-heading stage, dry matter accumulation Increased with the increase of nitrogen application rate. The dry matter accumulation increased with the increase of nitrogen application rate when the proportion of nitrogenous fertilizer to total nitrogen was less than 44.56% at heading-maturity. Under the experimental conditions, basal fertilizer is 40% ~ 50%, tillering fertilizer is 30%, and panicle fertilizer is 20% ~ 30%.