Q. Consider the following statements regarding the unbalanced use of fertilizers in India:

1. Nitrogen fertilizers are used in higher amounts in comparison to potassium and phosphate fertilizers in India.
2. The price differentials are a major reason for the unbalanced use of fertilizers in India.
3. Extensive use of nitrogen fertilizers leads to nitrate contamination of groundwater.
4. Nitrate, once it enters the underground water system, cannot be removed.

Which of the above statements is/are correct?
Answer: 1, 2, 3 and 4
Notes: All four statements are correct. In India, over-application of nitrogen compared to potassium and phosphate is prevalent due to price differences and lack of awareness. This leads to nitrate contamination of groundwater, and once nitrate enters the underground water system, it cannot be effectively removed. These factors combine to create significant environmental concerns in Indian agriculture.