知识贝壳
知识贝壳
所属栏目：英汉烟草科技
The range of nitrate nitrogen content in various types of leaf tobaccois shown in Table 21.1. The nitrate nitrogen content is significantly correlated to the amount of fertilizer nitrogen added to the field and to thepercentage of total nitrogen in the le ......（本文共 2420 字 ） [阅读本文] >>