The Effects Of Supplementary Irrigation On Water And Fertilizer Of Soybean In Arong Qi Area

In order to improve the low yield,unstable yield and low fertilizer utilization rate of the‘rain-raising agriculture’in the arongqi area of hulunbeier,The experiment conducted research on yield,utilization efficiency of fertilizer,residual of nitrogen element and the meteorological data were analyzed by setting up three levels of irrigation low-water medium-water high-water and three levels of fertilization low-nitrogen medium-nitrogen high-nitrogen and by carrying out conventional handling(W0N3)and blank-space handling(W0N0)on the local conventional crops to undergo the water-nitrogen interactions.The main conclusions are as follows:1.According to the analysis of the meteorological and soil data,the year of soybean rich water was obtained.In the year of flat water,the normal water requirement of soybean could not be meeted in the period of grain removal,and the rest of the growth period showed a state of water surplus,and the different growth period of soybean in the dry water year was different degree of water deficit.It was suggested that the amount of irrigation at grain filling stage was 50 and 80 mm in wet season and flat water year,respectively.In the dry water year,irrigation should be carried out in the bud stage in addition to 30 mm irrigation at the grain filling stage.2.The physiological indexes of soybean(plant height,stem diameter,leaf area and so on)were increased with the increase of irrigation and fertilization.The regression model showed that the plant height and leaf area were greatly influenced by the irrigation amount,and the stem diameter was greatly influenced by the fertilizer.The joint effect of the two had a promoting effect on plant growth.Soybean yield was the result of the comprehensive effect of the number of pod per plantgrain number per pod and hundreds of grain weight,when the irrigation amount was 1400 m~3/hm~2,the maximum yield was 3555.6 kg/hm~2when the nitrogen application was 95 kg/hm~2.3.when Nitrogen application is less than N2 under the condition of water and nitrogen interaction,the Nitrogen application application amount is positively proportional to the n uptake amount of plants.The nitrogen content of seeds increases with the increase of irrigation water and nitrogen application.4.After harvest,the residual soil nitrate nitrogen was less affected by irrigatio n water,which was greatly affected by fertilization.N1 treatment was 132.80~140.60kg/hm~2,N2 treatment was 139.31~149.26kg/hm~2,and N3 treatment was 155.97~159.57kg/hm~2,of which W0N0 treatment was 102.02kg/hm~2.5.The daily water consumption of each growth stage of soybean was decreasi ng in successive stages according to the popding period,the grain stage,the flower ing stage,the branching period and the mature stage.In the Poding period,the wat er consumption was 3.59~5.47mm/d,the grain stage was 3.36~4.72mm/d,the flower ing period was the most critical period for the soybean water requirement,and the most obvious time of the irrigation effect during the growth stage6.The fertilizer contribution rate,fertilizer agronomy efficiency and nitrogen ut ilization efficiency were W3,and the nitrogen fertilizer rate reached the maximum at the level of N2,in which the fertilizer contribution rate was 36.88%,the agricul tural efficiency was 13.80kg/kg,and the nitrogen fertilizer utilization efficiency was49.71%.The maximum utilization rate of fertilizer W2N1 was 37.63kg/kg,and the partial productivity of nitrogen decreased with the increase of nitrogen application,and the treatments ranged from 28.38~43.41kg/kg.7.Under the conditions of water and nitrogen interaction,the best yield and fe rtilizer utilization efficiency was obtained by the optimum irrigation amount of 1715~1826.79m~3/hm~2,and the optimum nitrogen application amount 97.25~104.96kg/hm~2.