上传者: 38651929 
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                                    上传时间: 2021-02-22 09:07:48
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                                    文件大小: 497KB
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                                    文件类型: PDF
                                
                            
                                
                            
                                With the color changes of main stemleaves of two kinds of rice variety as the research objects, this study analyzes the RGB value changes of leaf color with the dynamic changes of SPAD value under different growth periods and different nitrogen levels, so as to build RGB-SPAD mathematic models of ri