前茬冬作马铃薯的早稻氮肥合理调控初步试验

Preliminary experiment on the rational regulation of early rice nitrogen fertilizer under preceding winter potato planting

为进一步探讨前茬冬作马铃薯的早稻氮肥合理调控,进行了不同施氮量对早稻产量的影响试验。结果表明,早稻施氮量为60 kg/hm^2时产量显著高于施氮量为90、120 kg/hm^2的处理,抗倒伏能力强,同时氮素农学利用效率和偏生产力均具有显著优势。此外,施用有机肥的增产效果显著。建议前茬冬作马铃薯的早稻氮肥减施70%~80%,合理施用有机肥,有利于提高产量、提高利用率、增加经济收益。

This experiment was carried out to study the rational regulation of early rice nitrogen fertilizer under preceding winter potato planting.Field experiments were conducted to compare the effects of different application levels of nitrogen fertilizer on early rice yield when the winter potato was proper preceding crop.The yield of early rice when nitrogen fertilizer was 60 kg/hm2 was significantly higher than 90 kg/hm2 and 120 kg/hm2,and has stronger lodging resistance.The nitrogen agronomic efficiency and nitrogen partial factor productivity were highest with the pure nitrogen of 60 kg/hm2.The yield of early rice was increased significantly by organic fertilizer application.Therefore,it is suggested that the proper application of organic fertilizers and reducing the amount of using nitrogen fertilizer by 70%-80%in early race growth when winter potato were proper preceding crop,were beneficial to increase the yield,utilization rate and economic benefits.