Effects of Irrigation Methods and N Application Level on Cotton Growth and Nitrogen Use Efficiency
We investigated the effects of different irrigation methods (drip and flood) and N application dose on cotton plant biomass, fertilizer N accumulation, lint yield of cotton, and nitrogen use efficiency, in a two-year field experiment. We found that drip irrigation significantly increased cotton plant biomass, N uptake, lint yield of cotton, and N use efficiency (NUE) in comparison with flood irrigation. Biomass and N accumulation in all plant parts under drip irrigation were significantly greater than under flood irrigation, except for the roots. This suggested that the improved water regime of drip irrigation reduced cotton root growth while it improved shoot growth. N fertilizer application significantly increased cotton plant biomass and nitrogen absorption. Multiple comparisons between different N dosages showed that the highest lint yield was at 360 kg·hnr-2, followed by 480, 240 and 0 kg·hm-2, showing that excess N input did not contribute to higher lint production. Increased N fertilizer application resulted in lower N use efficiency, N agronomic efficiency, and N partial factor productivity. Significant interaction was observed between irrigation methods and nitrogen on boll number per plant and lint yield of cotton.
irrigation methodsN application rateyieldnitrogen use efficiencycotton
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NSTL
万方数据
维普
