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应用15N对“豌豆—稻—稻”不同施氮量的各季和全年氮素利用率进行研究。结果表明N2处理 (5 2 5kgN/hm2 )的产量及利润最高 ,氮素利用率也接近利用率最高的N1处理 (375kgN/hm2 )。因此 ,“豌豆—稻—稻”每公顷年施氮量 5 2 5kg/hm2 较为适宜。从N2处理三季作物来看 ,晚稻的氮素利用率 (34 .87% ) >早稻的氮素利用率 (33.0 2 % ) >豌豆的氮素利用率 (1 4 .44 % )。
Application of 15N on the nitrogen use rate of “pea-rice-rice” in different seasons and annual nitrogen utilization rate were studied. The results showed that the yield and profit of N2 treatment (525kgN / hm2) were the highest, and the nitrogen utilization rate was close to N1 treatment (375kgN / hm2) with the highest utilization rate. Therefore, “pea-rice-paddy” is more suitable for application of nitrogen application rate of 525kg / hm2 per hectare. Nitrogen use efficiency (34.87%), N utilization rate (33.0 2%) and N utilization efficiency (14.44%) of pea in late rice ranged from N2 to three-season crops.