DIRECTIONS: In Questions Nos. 146-150, The diagram shows Which of the following is a Biological method of soil conservation ?

Explanation

promote contouring in the 1930s as an essential part of erosion control eventually led to its widespread adoption. The practice has been proved to reduce fertilizer loss, power and time consumption, and wear on machines, as well as to increase crop yields and reduce erosion. Contour farming is most effective when used in conjunction with such practices as strip cropping, terracing, and water diversion.