一、植物体的硝态氮测定(一) 硝态氮在植物体内的变化植物体内硝态氮(NO_3—N)的含量随着植物生长期不同而有显著的变化,一般的文献都说明硝态氮在植株初期生长中含量较高,而在结蕾以后逐渐地减低,以至消失。此外,由于硝态氮的本身在植物氮素转化过程中是一个变化很快的居间产物,并且是在不断的更新,因此,以硝态氮含量 First, the determination of nitrate nitrogen plants (A) nitrate nitrogen changes in plants Nitrate nitrogen (NO_3-N) content of plants with the plant growth period has a significant change, the general literature shows that nitrate Nitrogen content in the initial growth of plants higher, but gradually reduced after the knot bud, or even disappear. In addition, since nitrate nitrogen itself is a fast changing intermediate product in plant nitrogen conversion and is constantly being refreshed, the nitrate nitrogen content