concentration on 托福

Potted plant experiment was used in studying the effect of 7% glyphosate aqueous solution at five concentrations on soil salinize and alkalize.

通过室内盆栽模拟实验,研究了5种浓度7%甘膦水剂对化和碱化影响。

EC90 value from the size of view, Dimethachlon at a relatively low concentration of Botrytis cinerea on ginseng has a strong inhibitory effect.

从EC90值大小来看，菌核净在较低浓度下对人参霉病菌也有较强抑制作用。

The effects of different concentrations of arsenic on spore germination and rhizoid and prothallium growth of Pteris vittata under aseptic condition were studied.

研究无菌条件下不同浓度砷对蜈孢子萌发、假根和原叶体生长发育影响。