What is a fertilizer ? Name any two fertilizers. State two harmful effects caused by the excessive use of fertilizers.
Fertilisers are chemical substances which are rich in a particular nutrient. Some examples of fertilizers are urea, potash, NPK (nitrogen, phosphorus, potassium), etc.
Harmful effects caused by the excessive use of fertilizers are-
(i) Excessive use of fertilizers makes the soil less fertile.
(ii) Excessive use of fertilizers causes water pollution.