Abstract:

【OBJECTIVE】≈Different nitrogen application and different times, the analysis of nitrogen levels on some physiological indices of soybean, soybean for future research to provide scientific evidence of the physiological indicators ; 【METHOD】≈In order to research orderliness of physiological indexes of soybean in different nitrogen treatment, we maked use of NIRS and SPAD-502 instrument and so on to mensurate leaf spectra, chlorophyll, leaf area and nitrogen content of soybean in different growth period ; 【RESULTS】≈The results showed that influence on the trend line of leaf area, nitrogen content and leaf dry matter accumulation of soybean in different nitrogen treatment, they were N2>N1>N3>N0, and existed highly significant difference, it was N3>N2>N1>N0 in SPAD;【CONCLUSION】≈ Growth period in the different indicators of various physiological differences between different N levels were significantly or very significantly.