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用~(15)N标记硫铵研究了大田条件下稻麦两熟对氮肥的吸收和利用。结果表明:水稻对保花肥的利用率最高,对基肥和分蘖肥的利用率明显低于保花肥和粒肥。小麦对前茬所施氮肥的利用率,拔节期接近最高。小麦对前茬所施氮肥的吸收量很少,拔节期只占自身总氮量的5%左右,拔节以后下降。因此,提高水稻对基肥和分蘖肥的利用率,是保证水稻高产的有效措施;而稻茬麦高产主要应依靠当季供氮。
Nitrogen fertilization and utilization of rice and wheat double cropping under field conditions were studied by ~ (15) N-labeled ammonium sulfate. The results showed that rice had the highest utilization rate of balsam fertilizer and the utilization rate of base fertilizer and tillering fertilizer was significantly lower than that of balsam fertilizer and grain fertilizer. The utilization rate of wheat nitrogen applied to the previous crop reached the highest at the jointing stage. Wheat had little absorption of nitrogen fertilizer on the previous crop, jointing only accounted for about 5% of its total nitrogen, decreased after jointing. Therefore, increasing rice utilization rate of base fertilizer and tillering fertilizer is an effective measure to ensure high yield of rice. However, the high yield of rice stubble should mainly rely on seasonal nitrogen supply.