氮肥和种植密度对通粳981产量影响的函数模型研究

摘要

采用两因素不同水平裂区设计试验,通过多元非线性回归分析,探明了不同种植密度、施氮量对通粳981产量的影响.结果表明:当基本苗为113.8万/hm2、施氮量为327.4 kg/hm2时,通粳981具有最大的产量潜力12160.74 kg/hm2.产量大于11250 kg/hm2的密、肥合理区间为:基本苗82.5万~135.0万/hm2、施氮量300.00~356.25 kg/hm2.%By conducting the split-block experiment with two factors at different levels,we studied the effects of nitrogen fer-tilizer application rate and planting density on the yield of japonica variety"Tongjing 981"through the multivariate nonlinear re-gression analysis. The results showed that the maximum yield potential of"Tongjing 981"could reach 12160.74 kg/hm2under the conditions of 1138000 basic seedlings per hectare and applying 327.4 kg nitrogen per hectare. For obtaining high yield more than 11250 kg/hm2,the reasonable basic seedlings should be 825000~1350000/hm2,and the proper nitrogen application rate should be 300.00~356.25 kg/hm2.