With reproductive process, the nutrients concentration of the organ in both cotton intercropping and cotton alone gradually decline.
随生育进程，单套作棉各器官中养分浓度逐渐下降。
Nitrogen release characteristic of Dianchi lake sediment and the nitrogen nutrients concentration of overlying water body was studied through simulating cultivation.
通过模拟培养，研究了底泥氮营养的释放及上覆水体中氮营养的浓度变化特征。
The nutrients varied in concentration in the different midgut segments.
营养物质在中肠不同部分的浓度不同。
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