In the context of India, which of the following is/are considered to be practice(s) of eco-friendly agriculture ? 1. Crop diversification 2. Legume intensification 3. Tensiometer use 4. Vertical farming Select the correct answer using the code given below :
Explanation
Crop diversification breaks pest cycles and spreads nutrient demand, legume intensification adds nitrogen to the soil through root-nodule bacteria and reduces fertiliser use, and tensiometers measure soil moisture so farmers irrigate only when the crop needs water. All three are promoted in India as eco-friendly, resource-conserving practices. Vertical farming grows crops in stacked, artificially lit indoor systems that use a lot of energy, so it is not counted among them. The answer is 1, 2 and 3 only.