| With the rapid development of facility agriculture in China,although the intensive degree is very high,but because of the uneven distribution of water resources in China,still have higher economic requirements for water-saving irrigation.Based on tomato production in greenhouse,the water requirement of tomato seedling growth and development was studied and analyzed in this study.the water requirement and economy of tomato irrigation in greenhouse were balanced.The tomato water stress experiment based on chlorophyll fluorescence imaging system analysis was carried out in the institute of intelligent detection of agricultural biological information,academy of information and electrical engineering,Shenyang agricultural university.The irrigation system was designed according to the analysis results.The main research contents are as follows:Firstly,in order to realize the real-time monitoring of soil moisture content and ensure the growth and development of the experimental samples under the given soil moisture content,a real-time monitoring system of soil moisture content was designed.The STM32F103RBT6 is used as the core controller.MS10-BAA soil moisture sensor was used to measure soil moisture.Displaying soil moisture content in real time by adopting a liquid crystal display ILI9341 driven TFT-LCD;At the same time,the system also has a warning function,when the soil moisture content is not within the set range value prompt staff.Secondly,in order to determine the optimal soil water content of tomato seedlings,under the established water stress conditions,the chlorophyll fluorescence imaging system modulated by IMAGING-PAM was used to collect the chlorophyll fluorescence imaging images of tomato seedlings,and the fluorescence image,kinetic curve and fluorescence parameter data were calculated and analyzed.The changes of chlorophyll fluorescence parameters of tomato seedlings under different water stress were studied and analyzed.the optimum soil water content for tomato seedlings growth was determined to be 65 % ～ 70 % of the maximum field water holding capacity,which provided a theoretical basis for greenhouse tomato irrigation in seedling stage.Finally,the irrigation system of tomato seedlings in greenhouse was designed on the premise of the optimum soil moisture content determined by the experimental results.The system is designed on the basis of the soil moisture content detection system,and the whole greenhouse irrigation system is monitored and controlled by the upper computer. |
