Research On The Use Of Water And Fertilizer For Drip Irrigation Multiple Cropping Silage Maize

Objective: This paper mainly studies the nitrogen treatment of silage maize water consumption,water yield and water use efficiency, photosynthetic physiological indexes, growth indices and the influence of nitrogen utilization efficiency, etc.To improve silage corn yield and water use efficiency,Silage maize determine appropriate N application rate and the row spacing pattern,For silage corn and development of high quality high yield and high efficiency ecological agriculture to improve the scientific basis.Methods: In this paper based on the irrigation quota of 325 mm, with multiple silage corn water use efficiency and yield as the goal, the silage corn varieties as the "RUI YU F98" as test materials.Set 6N application levels, respectively, were 14.04, 97.56, 167.16, 236.76, 306.36, and 375.96 kg/hm~2,Study a tube of two lines(80 + 40) and a pipe line(60 + 60) two spaced modes of silage maize water consumption, yield and water use efficiency, growth index, photosynthetic physiology index and nitrogen utilization efficiency, etc.Results: The N application rate is 236.76 ~ 306.36 kg/hm~2, water consumption is the largest,A tube of two lines(80 + 40) less than a pipe line(60 + 60) 3.05 ~ 15.31%;N application rate of 236.76 kg/hm~2,Water Use Efficiency(WUE) is the largest,A tube of two lines(80 + 40) more than a pipe line(60 + 60)5.57%;A tube of two lines(80 + 40) N application rate of 271.35 kg/hm~2, reached the highest silage maize yield of 101261.58 kg/hm~2,A pipe line(60 + 60) N application rate of 288.49 kg/hm~2, yield the highest, 99221.92 kg/hm~2,N application rate is 236.76 ~ 306.36 kg/hm~2, a tube of two lines(80 + 40)than a pipe line(more than 60 + 60) 1.41 ~ 2.77%.N application rate increased, the net photosynthetic rate, transpiration rate and water use efficiency increased after decreased, N application rate is 236.76~306.36 kg/hm~2, photosynthetic physiological indexes minimum significantly; Photosynthetic active radiation is 1500 ~ 2000 mu mol/m~2 / s and N application rate is 167.16 ~ 236.76 kg/hm~2,Jointing stage, a tube of two lines(80 + 40), net photosynthetic rate and transpiration rate is higher than a pipe line(60 + 60), a tube of two lines(80 + 40), water use efficiency is significantly higher than a pipe line(60 + 60);N application rate is 167.16 ~ 236.36 kg/hm~2, jointing stage and spinning tasseling stage, a tube of two lines(80 + 40) photosynthetic intensity is significantly higher than a pipe line(60 +60).N apparent loss increase significantly with the increase of N application and, a tube of two lines(80 + 40) N application rate of more than 236.76 kg/hm~2, a tube line(60 + 60) N application rate of more than 306.36 kg/hm~2, nitrogen loss is significant.Nitrogen contribution first increased after decreased with the increase of N application, N application rate of 236.76 kg/hm~2, nitrogen contribution is the largest, N application rate is 97.56 ~ 236.76 kg/hm~2, a tube of two lines(80 + 40) the contribution rate of the nitrogen fertilizer is significantly higher than a pipe line(60 + 60).Nitrogen agronomic efficiency and decreased with the increase of N application, N application rate is 97.56 ~ 236.76 kg/hm~2,nitrogen agronomic efficiency is the largest, a tube of two lines(80 + 40) is significantly higher than a pipe line(60 + 60).Conclusion: This experimental conditions, comprehensive analysis of silage maize water consumption, yield and water use efficiency, growth index, photosynthetic physiological indexes and apparent loss of nitrogen, nitrogen contribution rate and efficiency of nitrogen agronomy,Determine and silage corn N application rate of 236.76 kg/hm~2, under the condition of the nitrogen, recommend silage corn spacing pattern for a tube of two lines(80 + 40).