题目内容

Soil particles are classified into four basic soil classes based on particle size, namely gravel, sand, ______ and clay.

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In agricultural soils, soil profile can be divided into ______ , subsurface layer and bottom layer from top to bottom.

The main pathways of soil available nitrogen loss are ______ and denitrification.

Soil water potential is usually ( ).

A. Less than zero
B. Equal to zero
C. Larger than zero
D. Larger than zero or equal to zero

Forest workers and researchers use ______ to judge the soil acidity or alkalinity.