Concept:Uncontrolled use of chemical fertilizers can severely damage the environment.
Explanation:Applying
N-
P-
K fertilizer adds excess nutrients like nitrogen and phosphorus to the soil.
When rainfall occurs, these extra nutrients are washed into nearby rivers and lakes.
This process causes eutrophication, leading to algal blooms and depletion of oxygen in water.
As a result, aquatic plants and animals may die, and water quality becomes polluted.
Methods like shifting cultivation, mixed farming, and crop rotation are more natural and cause less harm to the ecosystem.
Answer:A. Application of
N-
P-
K fertilizer