| This paper aims at the problems of low water and fertilizer utilization rate and soil salinization in the compacted land in Xiangshan area of Ningxia.A combination of indoor experiment and community experiment was used to systematically carry out water,fertilizer and salt control on the growth,photosynthesis,yield and quality of watermelon in Ningxia compacted land The research on the impact of the study will provide a theoretical basis and technical support for watermelon,water saving,fertilizer and quality improvement of the watermelon in Ningxia.The main findings are as follows:1.Using the indoor fixed-head soil column test,the effect of one-dimensional vertical infiltration characteristics of soil with different soil bulk density and irrigation water quality was studied.The results showed that:under the condition of soil bulk density of 1.3 5 g/cm3(1.45 g/cm3)and irrigation water Compared with the conductivity of 0mS/cm,the infiltration time of irrigation water conductivity of 2.5mS/cm,5.0mS/cm and 7.5mS/cm was reduced by 17.6%(15.2%),27.2%(26.5%)and 35.3%(26.5%);Kostiakov infiltration equation can better fit the infiltration process of soil moisture of different bulk density,and the model has a higher fitting accuracy for the soil infiltration process of soil bulk density of 1.45 g/cm3.Under the conditions of water supply conductivity of 2.5ms/cm,5.0ms/cm,and 7.5ms/cm,the soil column profiles of the two bulk density soils have obvious salt accumulation;under the infiltration conditions of the four water supply quality,In the upper layer of the soil,the soil moisture content of both bulk densities showed a sharp decline trend.Within a certain range,with the increase of soil bulk density,the soil porosity decreased,and the movement process of water was hindered,which affected the soil water content.rate.2.A random block test was used to study the effects of different water stress and fertilization on the growth,photosynthesis,yield and quality of pressed sand melon.The results showed that:under the same fertilization amount,various physiological indexes and yield of pressed sand melon Increased with the increase of the lower limit of soil moisture.The content of soluble sugar and soluble solids that affect the quality of pressed sand melon decreased with the increase of the lower limit of soil moisture,and the content of organic acids decreased with the increase of the lower limit of soil moisture.Comprehensively considering the growth index,yield,quality and economic benefits of pressed sand melon,the soil moisture lower limit is controlled at 60%-65%,the irrigation quota is 10 m3/667m2,the amount of fertilizer application is llkg/667m2,and the number of irrigation times is 6 times.Is the best way.3.A random block experiment was used to study the effects of different irrigation modes on the growth,photosynthesis,yield and quality of pressed sand melon under the conditions of plastic film and bare land.Salty irrigation mode(F2)treatment compared with bare-salt irrigation mode(L2)treatment and other 10 treatments under bare field conditions,growth,photosynthesis,yield and quality are more reasonable,F2 treatment is compared with L2 treatment growth The index increased by 35.3%?62%,the net photosynthetic rate increased by 21.7%,the vitamin C content increased by 13.9%,the yield increased by 23.3%,and the soil salt content decreased by 7.3%.Comprehensively considering the yield,quality and economic benefits,it is the best way to choose salty and salty irrigation mode during the growth period under the mulching conditions. |
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