题目内容

In a certain water content range, soil can be shaped by external forces. When the external forces disappear or the soil is dry, soil can still maintain its shape. This is the soil plasticity.

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For sandy soils, the capacities of water and fertilizer retention are weak. The efficiency of fertilizer is high, but nutrients can only be available for plants in a short time. There is a possibility of fertilizer shortage for crops in late stage. Thus, farmers say sandy soil is good for seedlings, but bad for mature crops.

Soil stickiness refers to the property of the soil particles bonded together by various attractive forces.

The organic matter is loose and porous. It plays a beneficial role in the formation of granular structure. The soil with high content of organic matter has more macropores, resulting in small porosity.

Because the size and shape of soil pores are irregular, it is difficult to determine the pore sizes by direct determination. In soil science, a determinable soil property related to pore size, namely soil water suction, is selected to indirectly determine the pore diameter.