Fertilizer in rivers can cause an increase in algae growth in nitrogen, phosphorus and algae. These substance are used by the farmers on the crops to increase the productivity in their farm or land.
Fertilizers are the chemical medicines or substance that helps to crops like wheat and jowar to level up their productivity and these fertilizers contains many essential things like nitrogen, phosphorus and algae.
Fertilizers can be artificial or natural substance which enhance the growth of the field crops and increase the natural fertility of the soil.
Thus, option D is correct.
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