题目内容

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

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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.

Soil is a heterogeneous system, composed of solid, liquid and gas phases.

The essential feature of soil is rock weathering.