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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.

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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.

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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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