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Cite this article:马建琴.双目标条件下玉米水肥耦合效应分析及配施方案优化研究[J].灌溉排水学报,0,():-.
majianqin.双目标条件下玉米水肥耦合效应分析及配施方案优化研究[J].灌溉排水学报,0,():-.
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Analysis of Water and Fertilizer Coupling Effect of Maize and Optimization of Combined Application Scheme under Double Objectives
majianqin
North China University of Water Resources and Electric Power
Abstract:
Abstract:【Background】Nowadays, China's agricultural production is facing the dual pressure of water shortage and serious agricultural non-point source pollution. Therefore, the development of water-saving and fertilizer-saving, green and energy-saving agriculture is the only way to achieve high-yield and high-efficiency crops.Soil moisture and nutrients are not only the basic conditions for crop growth, but also the most important controllable indicators in the growth period.Henan Province, as one of the main producing areas of corn, is also an important production area of agricultural products and grain in China.At present, the coupling analysis of water and fertilizer and the optimization of combined application scheme of maize are mostly based on the single goal of yield, which can not meet the needs of multiple objectives such as economic benefits and production benefits.【Objective】Unreasonable irrigation and fertilization during the growth period of summer maize will cause the risk of high consumption and low efficiency.In order to explore the coupling effect of water and fertilizer on corn yield and Water Use Efficiency(WUE), and to find the best water and fertilizer program during the growing period.【Method】 To utilize agricultural water resources efficiently, three irrigation levels and three fertilization levels were set for summer maize as the research object.First of all, based on the experimental data of irrigation and fertilization, this paper established a binary quadratic regression model with irrigation and fertilization as independent variables, yield and water use efficiency as dependent variables, and tested the significance of the regression model.At the same time, the single factor effect, marginal effect and coupling effect of water and fertilizer on Yield and Water Use Efficiency of summer maize were analyzed, which provided theoretical basis for water and fertilizer management of summer maize.Subsequently, the principle of the Non-Dominated Sorted Genetic Algorithm-II (NSGA-II) was introduced in detail, and an optimization model with irrigation volume and fertilization volume as decision variables and output and water use efficiency as objectives was established, and the genetic algorithm was used to solve the model.Finally, the best water and fertilizer scheme in maize growth period and the yield and Water Use Efficiency of the combination of water and fertilizer were obtained to achieve the high efficiency of water and fertilizer application in the whole growth period of maize.【Result】(1)The yield and Water Use Efficiency of maize increased first and then decreased with the increase of water and fertilizer;(2)The effect of water on Maize Yield and Water Use Efficiency is greater than that of fertilizer;(3)Water-fertilizer coupling has a positive interaction on corn yield and Water Use Efficiency.【Conclusion】The scheme of water and fertilizer application proposed in this paper is as follows: irrigation amount is 848.24 m3/hm2, fertilizer amount is 192.66 kg/hm2, the corn yield under this water and fertilizer combination is 10 667.52 kg/hm2, and the Water Use Efficiency is 3.11 kg/m3, which can provide decision-making reference for local corn production. Key words:maize;water and fertilizer coupling;Bi-objective optimization;Non-Dominated Sorted Genetic Algorithm-II;matching scheme
Key words:  maize;water and fertilizer coupling;Bi-objective optimization;Non-Dominated Sorted Genetic Algorithm-II;matching scheme