基于CGMD402的水稻生长指标光谱监测模型研究
毕业论文关键词：CGMD402；光谱监测；农学参数；光谱植被指数；模型
SPECTRUM MONITORING MODEL RESEARCH ON RICE GROWTH INDEX BASING ON CGMD402
Abstract：Rice growth monitoring is one of the hotspots in modern agriculture. In crop production and management, it is important to get real-time, rapid and accurate access to crop information. It directly affects the formation of the crop yield and the quality. The traditional information acquisition of crop growth is basically depending on sampling in the field and laboratory analysis test, which is time-consuming and easy to destroy plants. The traditional crop growth information acquisition mainly depends on the field sampling and indoor chemical analysis experiment, which is time-consuming and laborious, and it is difficult to meet the needs of rapid and non-destructive crop growth information. Because of its advantages of fast, real-time, non-destructive and so on, it is becoming an important means of information acquisition in the process of precision management of crop production. CGMD402 crop growth monitoring instrument developed by Nanjing Agricultural University National Agricultural Information Engineering Technology Center, which has the advantages of small size, light weight, low cost, and high integration, strong practicability, suitable for field test.The purpose of this study is to research on quantitative relation between rice growth index and CGMD 402 crop growth monitoring diagnostic instrument output vegetation index, the rice field of different varieties and different nitrogen levels, to regularly use CGMD402 to obtain canopy after transplanting the normalized difference vegetation index (Normalized difference vegetation index, NDVI) and ratio vegetation index (Ratio vegetation index, RVI), synchronous destructive sampling for leaf dry weight (Leaf draw, weight, LDW), leaf area index (Leaf area, index, LAI) and leaf nitrogen content (Leaf nitrogen, content, LNC) and other agronomic parameters, the establishment of NDVI and RVI of rice growth monitoring model based on spectral index. The results show that the CGMD402 crop growth monitoring and diagnosis instrument has a good correlation with rice growth information, normalized difference vegetation index (NDVI) measurement and regression equations between LDW, LAI, LNC, R2 were 0.6140, 0.6625, 0.6328, RMSE were 0.15, 0.20, 0.13; the fitting equation between RVI and LDW, and LAI LNC and R2 were 0.6173, 0.6565, 0.6554, RMSE were 0.18, 0.18, 0.12. At the same time, for the accuracy of the instrument, at the tillering stage, tillering stage, jointing stage and jointing stage, booting stage, heading stage, using the ASD HandHeld2 portable spectrometer synchronous measurement of spectral vegetation index, and the ASD HandHeld2 portable spectrometer measured NDVI, RVI regression analysis, the coefficient of determination (R2) respectively. 0.7190, 0.7419，Show CGMD 402 crop growth monitoring and diagnosis instrument for rice growth have good monitoring ability, can carry on the quantitative estimates of rice agriculture index, and has high stability and precision, to provide technical support for the nitrogen precise management in rice production.