Effects of different water and nitrogen treatments on growth,quality and water and fertilizer use efficiency of alfalfa
[Objective]This paper investigates thoroughly the effects of different water and nitrogen treat-ments on the growth,quality and water and fertilizer utilization efficiency of alfalfa,and provides reference for the scientific formulation of a rational application of water and fertilizer management system suitable for alfalfa in Xinjiang.[Methods]A field experiment was conducted with three irrigation gradients as W1(3,750 m3/hm2),W2(4,500 m3/hm2)and W3(5,150 m3/hm2)and five nitrogen application gradients as N0(0 kg/hm2),N1(90 kg/hm2),N2(150 kg/hm2),N3(210 kg/hm2)and N4(270 kg/hm2),and each treatment was replicated three times to study the effects of different water and nitrogen treatments on the growth,quality and water and fertilizer utilization efficiency of alfalfa.[Results]Suitable water and nitrogen treatments signif-icantly promoted the growth and yield of alfalfa,and the plant height of alfalfa showed a trend of increasing and then decreasing with the increase of nitrogen application.The highest yield was obtained with W2 N3 under the synergistic effect of water and nitrogen.Irrigation,N application and water-N interaction had significant effects on crude protein,crude fat content,neutral detergent fiber,acid detergent fiber and crude ash of alfal-fa.There were different effects on nitrogen content,nitrogen uptake,nitrogen fertilizer bias productivity,ni-trogen utilization,nitrogen fertilizer agronomic efficiency and water use efficiency of alfalfa plants.The com-bined scores showed that the highest combined scores were all under W2 N3 treatment.[Conclusion]Different water and nitrogen treatments all had certain effects on the growth,quality and water and nitrogen utilization efficiency of alfalfa,and W2 N3(irrigation volume of 4,500 m3/hm2 and nitrogen application rate of 150 kg/hm2)under water and nitrogen treatments has the best effect.
alfalfawater and nitrogen intercroppingnutrient qualitywater and fertilizer use efficiency
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