Indiscriminate use of synthetic fertilizers can result in __:
1.Soil contamination by heavy metals
2.Reduction in the nutritional value of crops
3.Reduction in soil fertility
Choose the correct option from the codes given below:

Answer: [D] 1, 2 & 3

Fertilizers contaminate the soil with impurities, which come from the raw materials used for their manufacture. Mixed fertilizers often contain ammonium nitrate (NH 4N03), phosphorus as P20 5, and potassium as K20. The Arsenic, Lead and Cadmium present in traces in rock phosphate mineral get transferred to super phosphate fertilizer.

Since the metals are not degradable, their accumulation in the soil above their toxic levels due to excessive use of phosphate fertilizers becomes an indestructible poison for crops.

Further, over use of NPK fertilizers reduce quantity of vegetables and crops grown on soil over the years. It also reduces the protein content of wheat. maize. grams. etc., grown on that soil. The carbohydrate quality of such crops also gets degraded. Excess potassium content in soil decreases Vitamin C and carotene content in vegetables and fruits. The vegetables and fruits grown on overfertilized soil are more prone to attacks by insects and disease.

This question is a part of GKToday's Integrated IAS General Studies Module