Question

(i) What are the harmful effects of pesticides and fertilizers over a long period of time on soil?; (ii) Define Humus.

Answer 1

Excessive use of fertilizers over a long period may affect the alkalinity or acidity of the soil thus the chemical propertis of the soil re altered. and may adversely affect the crop production. Pesticides when get accumulated in soil, they harm soil biota and hinder microbial processes.

Answer 2

they make the soil more chemical hence the plants can't grow in there!