Fertilizers are obtained artificially on commercial basis. It is a chemical which contains the nutrients required for the crop to grow. Fertilizers supply various nutrients as they are nutrient specific e.g.- urea provides nitrogen. Mixed fertilizer provides any two mixture of nutrients. They are expensive but the use yield large production hence are a factor of high-cost farming.
Excessive use of fertilizers are not advisable as :
(1) It leads to soil and water pollution.
(2) It can destroy the fertility of soil. As the soil is not replenished, micro-organisms in the soil are harmed by fertilizers.