3. Which of the following practices can help in water conservation in agriculture? 

1. Reduced or zero tillage of the land

2. Applying gypsum before irrigating the field

3. Allowing crop residue to remain in the field

 

Select the correct answer using the code given below: 

1. 1 and 2 only

2. 3 only

3. 1 and 3 only

4. 1, 2 and 3

Correct Answer :

1 and 3 only