题目内容

The shortcomings of School of Agricultural Geology are they regard weathering process as soil forming process; they treat weathering products as soils; they also overlook the essential differences among soil, parent material and rock; they ignore the role of organisms in soil formation and fertility development, and overemphasizes the leaching of minerals.

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Soil is the basis for formulating measures to increase production in agriculture and forestry.

There is a distinctive boundary between effective and potential fertility, and they cannot transform into each other.

According to the sources of soil fertility, it can be divided into effective and potential fertility.

Soil is formed through the comprehensive effects of natural factors such as organisms, climate, parent material, topography and time, and human activities. It is consisted of mineral, organic matter, water and air. Soil is located on the surface of the earth's land surface. It is an unconsolidated and porous structure where green plants can grow, and it has the ability to protect environmental quality.

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