| This article addresses the serious status of soil leakage caused by soil leakage in non-cultivated sandy soil in Helan County,Ningxia.Soil agglomeration under the film drip irrigation,lack of oxygen affect the growth and development of crops,low temperature at night in winter and spring,and inhibits crop growth and the actual farmland issues such as comprehensive regulation of water,fertilizer,and gas heat are not carried out.Using the four-factor three-level orthogonality and the four-factor five-level quadratic rotation combination design method,a systematic experiment was conducted to study the effects of water and fertilizer coupling of greenhouse drip irrigation on the growth mechanism,photosynthesis,yield and quality of muskmelon.It provides a theoretical basis and technical support for improving the quality and efficiency of greenhouse melons and efficient water-saving irrigation and provides theoretical basis for accurate irrigation in the region and similar areas.The conclusions of the coupled thermal and thermal coupling of melons and waters are as follows:1.Four factors and three levels of orthogonal design methods were used to study the effects of different water and fertilizer gas heat treatment on melon growth index,photosynthetic characteristics,quality and yield.The experiment has obtained the primary and secondary factors that affect the melon growth index,photosynthetic index,yield and quality,single factor changes rule and optimal combination of water,fertilizer and gas.An analysis of variance and an analysis of variance were conducted on the yields of melons treated.The order of the four factors affecting the yield of melons was:irrigation quota>fertilization amount>geothermal water temperature>dissolved oxygen.Among them,the irrigation quota and the fertilizing amount have a very significant effect on the yield,and the dissolved oxygen and the geothermal pipe water temperature have no significant effect on the yield.Comprehensive analysis of various indicators to determine the optimal combination of factors for the A3B2C1D3,namely irrigation quota is 14m3/667m~2,fertilization amount is 4.5kg/667m~2,dissolved oxygen is 7.5mg/L,geothermal water temperature is 35?.The largest yield of watermelon was 3440.88kg/667m~2.2.Using the four-factor and five-level quadratic rotation combination design method,the effects of different water and fertilizer gas-heat coupling treatments on morphology,photosynthetic characteristics,quality,and yield of melon were studied.The mathematical regression models for melon growth indicators,photosynthetic characteristics,yield and quality,and water and fertilizer air-heat were established.The analysis showed that the water and fertilizer air-heat factors affect the melon growth index,photosynthetic index,yield and quality of the primary and secondary factors,single factor changes,interaction rules and the optimal combination of water and fertilizer gas heat.The effect of factors on the yield of muskmelon was as follows:irrigation quota>fertilization amount>geothermal water temperature>dissolved oxygen,irrigation quota and fertilization amount had extremely significant effects on melon yield,and the other factors had no significant effect.According to the analysis of the water-fertilizer-gas-heat coupled regression model established for the production index,the optimal combination scheme for water and gas heat output under the conditions of yields greater than 4.61?5.02kg/667 m~2 is defined as the irrigation quota 3.78?14.27 m3/667m~2 and the fertilization amount 4.61 to 5.02.Kg/667m~2,dissolved oxygen 8.37?8.63mg/L and geothermal pipe water temperature 30.20?31.43?;The optimal combination of water and fertilizer for air and heat under the conditions of maximum yield(3180.77kg/667m~2)is irrigation quota of 16 m3/667m~2,fertilization amount of 7kg/667m~2,dissolved oxygen of 7.5 mg/L and geothermal pipe water temperature of 30?,among this,the number of irrigations was 29,and the irrigation quota was 441.09 to 454.43m3/667m~2. |
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