湖北省棉花氮肥效应研究

通过17个大田试验,研究了湖北省棉花氮肥施用效果及氮肥最佳用量。结果表明,适量施用氮肥棉花增产增收效果显著,施氮比对照子棉增产131～1 244 kg/hm2,平均增产752 kg/hm2,平均增产率为31.1%。施氮纯利润平均为3 422元/hm2,产投比平均为4.07。氮肥偏生产力和农学利用率平均分别为13.20 kg/kg(N)和2.90 kg/kg(N)。根据线性加平台模型,求得湖北省棉花氮肥最佳用量平均为纯N114.0 kg/hm2。

Study on Effect of Nitrogen Fertilizer of Cotton in Hubei Province

A study was undertaken to evaluate the effect of nitrogen (N)fertilization on yield,economic benefit,N use efficiency and optimum N recommendation rate of cotton through field trials at 17 sites in Hubei province.The results showed that the yield and profit of cotton significantly increased when N supplied adequately.Compared with the treatment without N fertilizer,the increment of seed-cotton ranged from 131 kg/hm~2 to 1 244 kg/hm~2,the average increment was 752 kg/hm~2 and increased by 31.1 percent compared with the control.The average net profit of the N application was 3 422 Yuan/hm~2 and the value cost ratio (VCR)was 4.07.The average partial factor productivity of applied N (PFPN)and agronomic N use efficiency(ANUE)were 13.20 kg/kg(N)and 2.90 kg/kg(N),respectively.According to linear plus platform model,the average optimum N application rate was 114.0 kg(N)/hm~2 in Hubei province.