| Improving irrigation water efficiency and using new fertilizer products to ensure and promote crop quality and high yield are very important for promoting green ecological development of agriculture.This study took Xinjiang cotton as the research object and adopted a combination of experimental research,theoretical analysis,and model simulation evaluation to study the characteristics of water and salt fertilizer changes in cotton fields,physiological growth and nutrient absorption of cotton,as well as changes in cotton yield and water and fertilizer utilization efficiency under the coupling of four types of irrigation water and five concentrations of leaf biostimulants,and a quantitative evaluation was also conducted on the coupling effect of magnetoelectric water and leaf biostimulants on promoting cotton growth in order to elucidate the mechanism of the growth promoting effect of magnetoelectric water and leaf biostimulants on cotton.The main conclusions are as follows:(1)Magneto-electric water irrigation could effectively maintain and increase soil moisture in cotton root zone layer,and reduce soil salinity in cotton root zone layer.The synergistic effect of magneto-electric water and leaf biostimulant hormone could effectively promote the conversion of soil nutrients for cotton plant to absorb and utilize.Compared with brackish water and fresh water,the average volume water content of the soil under the condition of 0～60 cm soil layer of magneto-electric brackish water and fresh water was increased by 2.35%～21.36%,and 4.93%～14.98%,and the salt leaching efficiency was increased by 19.57%and 18.38%respectively under the condition of not spraying biological stimulant hormone.Under the condition of magnetoelectric fresh water irrigation,foliar spraying with 800 times the concentration of biostimulants reduced the average alkali hydrolyzed nitrogen content of the soil by 0.47%to 24.25%compared with that without spraying.(2)The synergistic effect of magneto-electric water and foliar biostimulant hormone could effectively promote the physiological growth of cotton,improve the resistance of cotton and increase the nutrient absorption.Compared with brackish water and fresh water,the leaf area index of magneto-electric brackish water and fresh water was increased by 10.72%～59.22%and 6.76%～26.10%,and the net photosynthetic rate of leaves was increased by 48.32%and 6.19%respectively under the condition of not spraying biological stimulant hormone.Under the condition of magnetoelectric fresh water irrigation,foliar spraying with 800 times the concentration of biostimulants increased the total nitrogen content of cotton leaves by 34.43%and the activity of catalase(CAT)increased by 35.98%compared with that without spraying.In addition,the parameters of the photoresponse model showed that the range of available light intensity of cotton was significantly improved by magneto-electric water coupled leaf biostimulants.(3)The synergistic effect of magneto-electric water and foliar biostimulant hormone could effectively improve the seed cotton yield and the utilization efficiency of water and fertilizer.Compared with brackish water and fresh water,the seed cotton yield of magneto-electric brackish water and fresh water was increased by 10.91%and 6.92%,and the nitrogen absorption rate was increased by 22.54%and 21.10%respectively under the condition of not spraying biological stimulant hormone.Under the condition of magnetoelectric fresh water irrigation,foliar spraying with 800 times the concentration of biostimulants increased seed cotton yield by 30.83%and cotton water use efficiency by 24.35%compared with that without spraying.(4)The cotton growth model established based on effective accumulated temperature could accurately fit the growth process of cotton plant height,dry matter accumulation and leaf area index.The soil moisture content,alkali hydrolytic nitrogen content,cotton water use efficiency and other indicators of cotton boll stage were highly correlated with cotton yield based on grey relational analysis.The interaction of irrigation water treatment and foliar biostimulant treatment on cotton growth reached significant level based on the results of two-factor variance analysis.The analysis results of the structural equation model showed that magnetoelectric water coupled foliar biostimulant treatment mainly improved the utilization level of water and fertilizer of cotton by improving the physiological growth status of cotton,and thus significantly increased the yield of cotton.Based on principal component analysis,it was concluded that magnetoelectric freshwater irrigation coupling foliar spraying 800 times concentration of biostimulant treatment is the best coupling treatment. |
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