ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

0.804和0.759。By using self-developed portable instrument for crop nitrogen monitoring, the information of rice canopy reflectance spectra was obtained from the field experiments with two rice varieties and four nitrogen application rates, and the rice plant was sampled from each plot for measurement of leaf nitrogen concentration (LNC) simultaneously. The correlations and the quantitative relationships between LNC and rice canopy reflectance spectra were analyzed, and the performance of portable nitrogen monitoring instrument was evaluated. Results show that its ability in monitoring nitrogen is excellent, and its performance is steady in field condition. Testing the correlations between LNC and canopy reflectance spectrum of four characteristic bands included in the instrument, the correlations in the mono-band of 660nm, 710nm and 810nm are all more than 0.5 with a significance testing (p<0.01). During the all growth stages, the coefficients of determination R2between LNC and spectral vegetation index （VI）with double-bands are more than 0.7, especially in the flowering and mature stages (R2＞0.83). In the whole growth period, the VI are significantly correlated with LNC, such as NDVI（810,710）and NDVI(710,546), the determination of coefficients R2 are 0.804 and 0.759. 