The content of the available ferrum enhanced by recycled straws, but that of the available zincum, copper and manganese had no changed obviously in soil.

秸直接还田提高了土壤的有效铁量,但对有效铜、有效锌和有效锰量影响不大。

This paper has introduced the green-protection zincum-chromium coat, i n ianther word, it is "DACROMET" coat, it is one kind of liquid that confected from zincum flake alumimium flake chromate flake.

本文详细介绍了绿色环保型锌铬涂层即“达克罗”涂层,锌片、铝片、铬酸盐等配制而成的溶液。