The content of mineral-fixed ammonium in soil was related not only to soil clay minerals but also to fertilization.

固定态铵的含量不仅与土壤中的粘土矿物有关，施肥对其也有影响。

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This study belongs to the across front item among soil fertilizers, clay minerals, agriculture balance fertilizing principle and chemical engineering controlled release technology.

本研究课题属于土壤肥料学、粘土矿物学、农业平衡施肥原理与化工控释技术交叉结合的前沿课题。

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The results showed that the main crystalline iron oxide minerals in the clay of red earth was goethite and hematite, but only goethite was detected in the clay of yellow soil.

结果表明，黄壤与红壤粘粒中氧化铁矿物组成主要差别在于红壤既含针铁矿又含赤铁矿，而黄壤只含针铁矿。

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On thermal satellite images, the soil here seemed to retain its heat unusually well a sign that it might contain clay or other hydrated minerals.

NEWYORKER: The Martian Chroniclers