Question

what would happen if we grow crops one after the other without using manures/fertilizers

Answer 1

It will simply decrease the fertility of the soil

Answer 2

Here is your answer friend..

Fertiliser or manure adds nutrients to the soil which is beneficial for the growth of plant.

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If will will grow the crops one after the other without using fertiliser or manure than :

⏭️The plant will not get proper nutrition for their growth. If plants will not get proper nutrition than they will not grow properly.

⏭️The soil of the field will get infertile. If the field will be infirtile than nothing can be harvested.

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Hope this will help u... ☺️☺️