Which of the following practices is not suitable for organic farming?

The correct answer is Option (1) → Tillage

Organic farming works to keep the soil covered and its structure intact, so repeated tillage — which oxidises soil organic matter, destroys soil fauna and invites erosion — runs against its principles; zero or minimum tillage is preferred instead.

Crop rotation restores fertility and breaks pest cycles, insectivorous birds give natural biological pest control, and compost is the standard organic manure — all three are recommended organic practices.