15. What can be the impact of excessive / inappropriate use of nitrogenous fertilizers in agriculture? 
1. Proliferation of nitrogen-fixing microorganisms in soil can occur.
2. Increase in the acidity of soil can take place.

3. Leaching of nitrate to the ground-water can occur.

Select the correct answer using the code given below.

1. 1 and 3 only

2. 2 only

3. 2 and 3 only

4. 1, 2 and 3

Correct Answer :

2 and 3 only