Step 1: Think about what organic farming avoids.
It avoids chemical fertilizers and pesticides, relying instead on natural methods to keep the soil healthy.
Step 2: First measure, natural nutrition for the soil.
Using compost, farmyard manure, vermicompost and bio-fertilizers rich in helpful microorganisms improves soil structure and fertility naturally, without harming the land in the long run.
Step 3: Second measure, smarter cropping and pest control.
Rotating crops on the same field keeps nutrients balanced and breaks pest cycles, while using neem based or biological pest control instead of chemical sprays protects both the crop and the surrounding biodiversity.
So the two useful measures are organic manures with bio-fertilizers, and crop rotation with biological pest control.