Soil : The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles:
Turning of soil:
This method is also called ploughing or tilling of soil.
It causes loosening of the soil.
It breaks down larger particles into fine grains.
This method maintains the airflow of the soil.
This enhances water and manure absorption by the soil.
It adds humus and nutrients to the soil and increases soil fertility.