Question

3. How are minerals replenished in the soil of a crop
field ?
4. What is organic farming? What are its advantages?​

Answer 1

Answer:

3) minerals are replenished by artificial and natural methods artificial methods include adding fertilizers , manures,crop rotation, mixed cropping etc. The natural methods by which the minerals are restored are carbon cycle, nitrogen cycle , sulphur cycle etc.

4) Organic farming is a form of agricultural practice that uses natural methods of farming. This means that chemicals, pesticides and other forms of substances that could harm the environment are not used in organic farming. Organic farming uses the natural methods of farming like crop rotation, green manure compost, biological pest control, mechanical cultivation and other natural methods to maintain the fertility and productivity of the soil. Pest control is also done by organic methods

Answer 2

by the nitrogen cycle,

decomposition of dead and decaying matter by microbes and other abiotic factors ,

and by ecological processes like erosion(or weathering),deposition,

degradation(of complex mineral structures by organisms like saprophytes).Also the soil replenishes itself through various other ecological processes and many other organisms also help in mineral replenishment in the soil.