Question

---------- has is required to maintain the fertility of soil​

Answer 1

Here is your answer :-

Answer:

Organic Manures, Fertilizers like NPK, Compost rich in humus, etc. are required to maintain the fertility of the soil.

Explanation:

Natural Methods to maintain the fertility of the soil are :-

1. Field Fallow
2. Crop Rotation
3. Mixed Cropping
4. Manures
5. Fertilizers
6. Compost

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Answer 2

Answer:

Manure

Explanation:

Because it increases the fertility.