| The article aims at the low water production efficiency of field crops in Yanghuang Irrigation District in Yanchi Country of Ningxia,the low water and fertilizer utilization rate,and the practical problems of water and fertilizers not being comprehensively controlled.It is based on Tianchizhang Village in Xicheng District of Xicheng County and is tested on "Ximen 6".Materials,comparative experiments and general rotating combination design test methods were used to systematically study the suitable water-saving irrigation systems,water-fertilizer coupling effects,and water production functions of maize,and they were designed to provide a theoretical basis for promoting efficient and water-saving irrigation in Yanghuang irrigation area.Based on and technical support.The main findings are as follows:(1)Using the comparative test method,two drip irrigation patterns,drip irrigation under drip irrigation and drip irrigation under drip irrigation,were set.Each drip irrigation pattern was set for 4 times,5 times,6 times,and 7 times for 4 different irrigation times.Different types of drip irrigation were studied.Effect of Drip Irrigation Times on Growth Index,Photosynthetic Characteristics,Seed Index and Yield of Maize.The results of the two-year experiment showed that the growth index,photosynthetic characteristics,yield,irrigation water production efficiency,and water production efficiency of drip-irrigated corn were better than drip irrigation in open land.In the flat water year,the yield of the irrigation was increased by 3.89%,8.20%and 99.09%,respectively,6 times,5 times,and 4 times.Since the increase in yield and quality of irrigation is less than 7 times compared with irrigation 6 times,and the water rights allocated in this area are in short supply,it is recommended that the number of drip irrigation irrigations for membranes in the flat water year(2016)be 6 times,and the irrigation during the emergence and jointing stage is appropriate.Once,the irrigation quota was 390 m3/hm2,irrigation was performed twice in the jointing and precipitating period,the irrigation quotas were 525m3/hm2 and 600m3/hm2 respectively,irrigation was conducted twice during the tassel-filling period,the irrigation quota was 600m3/hm2,and grouting-milk 1 irrigation period,irrigation quota 600 m3/hm2,irrigation quota 3315 m3/hm2,corresponding crop water requirement 6426.24 m3/hm2,yield 10705.35 kg/hm2,water production efficiency 1.67,crop coefficient 0.61 In the dry year(2015),the number of times of drip irrigation under the film is 7 times,and the irrigation during the emergence and jointing stage is 1 time,the irrigation quota is 450 m3/hm2,irrigation is performed 3 times in the jointing-candy phase,and the irrigation quota is 450m3/hm2,450m3/hm2,600m3/hm2,irrigation in the tassel-filling stage 2 times,the irrigation quota is 600m3/hm2,the irrigation during the grouting-milk stage,the irrigation quota is 600 m3/hm2,the irrigation quota is 3675 m3/hm2,and the corresponding crop water requirement is 4891.91 m3/hm2,yield 10655.35 kg/hm2,water production efficiency2.18,Coefficient was 0.44.(2)Using the three-factor and five-level quadratic rotation combination design method,under the conditions of drip irrigation under drip irrigation and drip irrigation under open soil,different water and fertilizer coupling treatments were used to study maize growth index,photosynthetic index,test index,and quality.And the impact of production.The mathematical models for regression analysis of maize growth index,test index,yield,quality,and water,nitrogen,and phosphorus triterpenoids under two drip irrigation patterns were established.The water,nitrogen and phosphorus factors affected the corn growth index and the test index,respectively.The primary and secondary factors of yield and quality,the law of single factor changes,the interaction rules,and the optimal combination of water and fertilizers.The order of the factors affecting the yield of corn drip irrigation under the membrane is:irrigation quota(X1)>phosphorus application(X3)>nitrogen application(X2),and the irrigation quota(X1)has an extremely significant effect on yield,and the amount of phosphorus applied(X3)The impact on yield is significant,and the remaining factors have no significant effect.According to the analysis of water-gas-heat-heat coupled regression model established for yield indicators,it is concluded that the combined water-fertilizer program under the condition of yield greater than 10500kg/hm2 is the irrigation quota of 5112.90-5778.90m3/hm2,and the nitrogen application rate of 160.65?213.9kg/hm2.Quantity 59.55?78.75kg/hm2.(3)A comparative experiment was conducted to study the water production function of corn in Yanghuang Irrigation District.Using multivariate linear regression analysis,Jensen model was used to obtain the sensitivity index of maize at different growth stages.Among them,?1 was 0.0372 at the emergence-joint stage,?2 was 0.1576 at the jointing-pre-harvest stage,?3 was 0.3125 at the tassel-filling,?4 was 0.1854 at the grouting-mature stage,and X5 was 0.0981 at milk-maturity.The use of this model can provide a theoretical basis for the optimization of irrigation system design in Yanghuang Irrigation District. |
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