Question

Why fertilisers and manures are required to be added to the soil periodically?

Answer 1

Answer:The substances which are added to the soil in the form of nutrients for the healthy growth of plants are called manure and fertilisers. It is important to add manure and fertilisers to the soil because in some places the soil as fewer nutrients for crops because the farmers grow crops after a crop in the same field.

Answer 2

Answer:

This is the proper explanation

Explanation:

Plants absorb the minerals and other nutrients from the soil. Due to this, the amount of these nutrients keep on declining in the soil. So, to keep the balance of these nutrients constant in the soil, fertilizers and manures are added periodically as they contain all plant nutrients such as nitrogen, potassium, phosphorus etc...

you're welcome ;)