Is it necessary to add manure or fertilizer to the field to get a good Crop ?

Soil owes its fertility to certain chemicals like nitrates and ammonia.

In course of time, a soil which had been originally rich in nitrogenous matter and other ingredientes necessary for the growth of plants become deficient in those ingredients.

Thus it is necessary to improve it’s condition by the addition of manures and fertilizers which supply the deficiencies.