Detection And Temperature Acquisition System Based On Thermal Imaging And Drought Resistance Of Crops

Recently, under the situation of increasingly serious shortage of water resources and severe drought disaster situation, studying the identification index and method of crop drought resistance, improving the accuracy of drought resistance identification, has already become an important topic attracting the attention of breeders, and is the important content of water-saving agriculture development. Drought resistance of crop varieties is an extremely complex traits, including growth status, morphology characteristics, physiological and biochemical parameters and yield. Therefore, drought resistance identification and screening of drought resistant materials need to make a comprehensive consideration. There existed long breeding cycle, big workload, tedious parameter extraction, backward analysis technology and assembly in the process. So it urgently need to research and development the technology and equipment of rapid identification of crop drought resistance.According to the situation of backward method of crop drought resistance identification and lacking of field rapid screening technology and equipment, this paper designed field and greenhouse cultivation experiments of different drought resistance crop varieties and established an index and method of crop drought resistance about temperature based on thermal imaging technology.The main research contents are as follows:1. First of all, we studied infrared image of seedling stage maize. The study found that the seedling stage corn temperature distribution obtained from infrared image has obvious characteristics. The leaf temperature distribution can reflect the growing status of corn. The leaf average temperature of the maize under drought stress (25.63℃) is higher than that of those under normal water(25.06℃). Thus we can conclude that leaf average temperature can rate as an early indicator of drought resistance identification.2. We studied the relationship of crop temperature and drought resistance. We found that the canopy absolute temperature of filling stage winter wheat and canopy temperature difference in the morning and afternoon of mature period both have a significant negative correlation with yield. The correlation coefficient reaches-0.76. The correlation coefficient between canopy temperature and stomatal conductance reaches-0.68. There has significant difference in different drought resistant varieties about chlorophyll.The result confirmed the image temperature based on thermal infrared can evaluate drought resistance of crops.3. We came up with a crop drought resistance temperature model based on the thermal imaging technology from the study above. The model rules on the drought resistance threshold K. Comparing the temperature of unknown drought resistance plant with the threshold, so we could get the drought resistance of the crop varieties. This method appraisal results are consistent with the results from normal physiological and morphological index. The effect is good.4. We developed a fast, low cost, high flux crop temperature acquisition special thermal image system. This system based on uncooled focal plane detector, integrated11mm poor thermal lens, acquisition control circuit, USB image acquisition card and5inch tablet PC, etc. The image resolution of the system is384*288, the temperature sensitivity is0.065℃. The system realizes the temperature calculation by calibration of the blackbody.