Question

how are nutrients again & again in added to soil .

Answer 1

Fertilisers and manures contain plant nutrients such as nitrogen, phosphorus, and potassium etc. So, when fertilizers and manures are added to the soil in the fields, then the soil gets enriched. The crop plants can then grow well in the soil

Answer 2

Field fallow, crop rotation and mixed cropping are three natural methods of replenishing the nutrients of the soil. These natural methods are not enough and farmers have to resort to manures and fertilisers❤️