Reason for the stagnation of Indian Agriculture during the colonial period are:
1. The British have introduced the Land Revenue system in 1793. As per this system, zamindars (landowners) needed to pay a high amount of revenue to the British Government and the source of revenue collection was from the peasants. The zamindars did not look after improving the land productivity which resulted in low agricultural growth and subsequently made the life of peasants worse.
2. Indian farmers were growing food crops like rice and wheat for consumption. The British Government was forcing Indian farmers to grow commercial crops like indigo for the British Industries, which lead to agriculture turning commercial and caused a shortage of food grains.
3. Lack of irrigation facilities and other important factors like the availability of fertilizer also impacted the agriculture industry and made it more vulnerable.