本文系统地报道了氯化胺、过磷酸钙、苹果枝木灰和饼肥四种肥料对国光和青香蕉苹果树的根际营养效果。

This paper systematically reports the effect of root nutrition in apple trees. After apply the four fertilizers, the best effect is the apple branch ash.

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我们还合成了磷酸钙-四氧化三铁复合物，应用于基因的可控运输和转染。

Then we prepared calcium phosphate-magnetite hybrid materials to deliver and transfect DNA.

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磷酸盐类的岩石(主要是磷酸钙)是四种最重要的基本化学商品之一。

Phosphate rock (mainly calcium phosphate) is one of the four most important basic chemical commodities.

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