BOTANY

Detailed explanation-1: -The pore space of a soil is defined as the portion of the soil volume occupied by air and water. It refers to the percentage of soil volume occupied by pore spaces. Pore-spaces directly control the amount of water and air in the soil and indirectly influence the plant growth and crop production.

Detailed explanation-2: -The pore space of soil contains the liquid and gas phases of soil, i.e., everything but the solid phase that contains mainly minerals of varying sizes as well as organic compounds.

Detailed explanation-3: -The soil particles seem to touch each other, but in reality have spaces in between. These spaces are called pores. When the soil is “dry", the pores are mainly filled with air. After irrigation or rainfall, the pores are mainly filled with water.

Detailed explanation-4: -Water-filled pore space (WFPS) is the ratio of volumetric soil water content to total soil porosity. A soil’s WFPS is determined simply from its bulk density and moisture content, because particle and water densities are stable at  2.6 and 1 kg/l respectively.

Detailed explanation-5: -There are large pores, called MACROPORES and there are small pores, called MICROPORES. Keep in mind that most of the pores found within a soil are microscopic and can not be seen by the naked eye. Micropores are those pores most responsible for holding water. Macropores are those responsible for holding air.