The ratio of a plant’s rate of carbon assimilation to the concentration of organic nitrogen in its leaves: a measure of the efficiency with which the plant allocates nitrogen to its photosynthetic apparatus.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。