Study On Distribution Mode Of Fertilizer And Filtration Equipment For Drip Irrigation System In Shiyang River Basin

Under the drought and water shortage in Shiyang River basin,the technology of drip irrigation under mulch has been widely promoted.Fertilization and filtration equipment is an important auxiliary equipment of water and fertilizer integrated micro-irrigation system,which can improve the stability of micro-irrigation system and the uniformity of irrigation fertilization.The suitable configuration mode of fertilization filtration equipment in drip irrigation system under the integrative membrane of water and fertilizer is of great significance to the long-term reliable operation of the system,and promotes the sustainable development of agriculture in Shiyang River basin.In this paper,the effect of pressure difference fertilization tank,proportional fertilization pump on fertilization performance and different operating conditions on the head loss of filter is investigated.Optimized drip irrigation system performance and laid in the large field.Through the field maize drip irrigation experiment,this paper probes into the water head loss and water and fertilizer uniformity under different combination and operation conditions of fertilization,filtration equipment and capillary tube,and according to the difference of crop growth and yield,selects the suitable configuration mode of drip irrigation equipment by synthetically considering the equipment performance and crop growth status.Through the above research,we get the following conclusions:(1)Through adjusting the working pressure,exploring the pressure difference fertilizer tank,proportional fertilization pump under different operating conditions of the filter head loss,found that the pressure differential fertilizer tank export fertilizer liquid concentration changes,proportional fertilization pump outlet fertilizer concentration of more than 85%,fertilization performance is good,The filter has low head loss and good blockage resistance.(2)Through electron microscope scanning and energy spectrum analysis,it is found that the plugging material attached to the filter(CORE)is not all phosphate granules,and the chemical reaction can be formed to attach to the phosphate surface.(3)Using the Dimensional analysis method,the basic quantity is deduced into 6dimensionless elements:H/C_iV_f~2?S_C/L~2?t_lV_f/L??V_fL/???/C_i,and the filter head loss formula is obtained through multivariate regression analysis,and the correlation coefficient reaches over 80%,which has certain reliability.Therefore,the head loss of the filter is related to the fertilizer concentration,the inlet velocity,the running time of filter type(filter,filter area),the density of water and the coefficient of kinematic viscosity.(4)In the length of drip irrigation belt,the difference of dry matter quality and tail was significant.When the length of drip-irrigation belt was 50m,the yield increased first and then decreased along the direction of drip irrigation belt.Compared with two irrigation belt,grain number and hundred grain weight of the crop under the flanking maze drip irrigation are higher than the embedded patch type drip irrigation belt.Considering synthetically,it is considered that the yield of the flank maze type drip irrigation is higher,and the soil moisture content is smaller during the growth period.It is suggested that the flank maze type drip irrigation belt be used,the working pressure of the system is 0.05 to 0.06MPa,the proportion of fertilization is 2%,the screen filter is 120 mesh.