Effects of differential pressure and pumping fertilization devices on cotton yield and nitrogen utilization
[Objective]To explore the effects of two fertilization devices,differential pressure fertilization and pumping fertilization,on nitrogen absorption,cotton yield and nitrogen use efficiency in drip irrigation cot-ton fields so as to provide theoretical basis for the development of water and fertilizer integration technology in drip irrigation cotton fields in arid areas of Xinjiang.[Methods]The three treatments were set up in the exper-iment:no nitrogen application(N0),differential pressure fertilization device(N300-differential pressure type)and pump-suction fertilization device(N300-pump-suction type),in which the nitrogen fertilizer was am-monium sulfate,and the dosage was 300 kg/hm2.[Results]Compared with N0 treatment,N300-differential pressure treatment and N300-pumping treatment significantly increased cotton total biomass,nitrogen absorp-tion and seed cotton yield.Compared with N300-differential pressure treatment,N300-pumping treatment had a more uniform distribution of ammonium nitrogen in emitter fertilizer solution,and the cotton biomass,nitro-gen absorption,seed cotton yield and nitrogen utilization rate increased by 15.94%,31.50%,7.32%and 52.98%,respectively.[Conclusion]Under the same fertilization amount,the variation range of ammonium nitrogen concentration in emitter fertilizer solution of pump-suction fertilization device with time is smaller than that of differential pressure fertilization device.Therefore,the uniformity of fertilization of pump-suction fertilization device is better than that of differential pressure fertilization device,and the pump-suction fertili-zation device promotes cotton growth and significantly improves nitrogen absorption,thus increasing seed cotton yield and nitrogen utilization rate.
cottondifferential pressure fertilization devicepump-suction fertilization deviceyieldni-trogen use efficiency
万方数据
维普
