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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.

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Because soil pores account for nearly 50% of the total soil volume. The solid particle density is about twice of the soil bulk density. So, the value of pore space ratio is usually around 1.

The fertility characteristics of clayey soils can be described as ( ).

A. Fertilizer efficiency is high; nutrients can be available for plants in a long time;
B. Fertilizer efficiency is low; nutrients can only be available for plants in a short time;
C. Fertilizer efficiency is high; nutrients can only be available for plants in a short time;
D. Fertilizer efficiency is low; nutrients can be available for plants in a long time;

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Mechanical composition refers to the percentages of soil particles in different size classes.

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Filed irrigation can promote the formation of good structures.

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