Distinguish between organic manures and chemical fertilizers..
Kindly refer to the link given below:-
https://www.meritnation.com/ask-answer/question/what-is-the-difference-between-manure-and-fertilisers/improvement-in-food-resources/395977
https://www.meritnation.com/ask-answer/question/what-is-the-difference-between-manure-and-fertilisers/improvement-in-food-resources/395977