Development And Empirical Analysis Of Photovoltaic Panel Matrix Rain Catchment Automatic Irrigation System In Northwest China

In recent years,the photovoltaic industry in China has been in a dilemma due to the influence of the "double-reverse" policy in Europe and the United States.At the current stage,the demand has prompted it to independently increase additional industries.The development mode of combining photovoltaic power generation with other industries was an effective way to solve the dilemma of the photovoltaic industry.Considering that the erection of photovoltaic panels occupies a large area of land resources in northwest China,which was suitable for the development mode combined with planting industry,and rainwater was the only water resource that could be directly utilized,this study took Hongsibu photovoltaic power station as an example,the rain catchment and utilization system was designed by using the photovoltaic panel matrix as the rain catchment surface,and the lycium barbarum planted under the photovoltaic panel were precisely irrigated with the automatic irrigation control system to realize the efficient utilization of water and soil resources.(1)Construction of rain catchment systemA set of rain catchment system was formed by using photovoltaic panel matrix as rain catchment surface and precision irrigation system.The results of simulated rainfall test and actual observation experiment showed that the collecting efficiency of photovoltaic panel matrix rain catchment system was over 90%.Based on the historical precipitation data of Hongsibu,the possible rain catchment amount in the wet years,the flat years and the dry years were analyzed,and the potential of irrigation water consumption was quantitatively analyzed.At the same time,the water quality of collected rainwater was tested,and the results showed that the water quality indexes all met the standards of farmland irrigation.(2)Implementation of precision irrigation systemThe planting experiments of lycium barbarum were carried out on gravel covered soil sample areas,red clay soil sample areas and desert sierozem soil sample areas under photovoltaic panels in the research area.In this study,Ancnoble GG-002D-3G automatic irrigation control system was adopted.The upper and lower limits of soil water content and other parameters of the irrigation system were set on the basis of field measurement.The TDR soil moisture sensor uploads the real-time monitored soil moisture information to the irrigation decision system through the wireless network,and the system issues irrigation orders based on the decision information to realize automatic irrigation.(3)Analysis of application effect of photovoltaic panel matrix rain catchment automatic irrigation systemThe irrigation amount during the growth period of lycium barbarum in field irrigation experiment was less than the theoretical irrigation quota calculated by formula method,and was less than the irrigation quota of lycium barbarum in Hongsibu area.According to the irrigation amount measured during the growth period of lycium barbarum,the irrigation amount of gravel covered soil sample area was the smallest,and the irrigation amount of desert sierozem soil sample area was the largest.And based on the analysis of the 30-year rainfall scenario in the study area,the collected rainwater in the wet years,the flat years and the dry years had the largest irrigation area in the gravel covered soil sample area and the smallest irrigation area in the desert sierozem soil sample area.Irrigation through photovoltaic panel matrix rain catchment automatic irrigation system could meet the local appropriate area irrigation requirements,based on the principle of "settling land with water",irrigation area could be appropriately expanded.The water-saving and economic benefits accumulated in different ways reached more than 245 yuan·mu-1.The growth index of lycium barbarum was observed,the plant height,crown width and ground diameter growth rate of lycium barbarum under gravel cover soil sample area was the best.(4)Problem analysis and countermeasures:The survival rate of lycium barbarum was low in the early stage of planting,but increased gradually with the increase of months.Through the determination of soil temperature,it was found that at the early stage of transplanting,the survival rate of lycium barbarum was low due to the low soil temperature in all the sample areas,so the transplanting time should be appropriately moved later or agricultural measures should be taken to increase the soil temperature.However,before and after planting,the soil nutrient content was very low,there was no significant increase in organic matter,total phosphorus and even a decrease in total nitrogen.At the later stage,soil improvement measures should be taken according to local conditions to cultivate soil fertility.