Advantages of using manures in the crop fields are:
(a) They improve fertility of the soil by providing mineral nutrients to the soil.
(b) Improve
soil texture by adding organic matter to the soil. Organic matter
increases water-holding capacity of sandy soil. It improves drainage in
clayey soil by preventing water logging.
(c) Use of organic manure helps in recycling of farm waste, saving the environment from excessive use of fertilisers.
(d) They provide food for soil organisms, which keep the soil in a healthy, balanced condition.
(e) Manures do not cost anything to the farmer as he prepares it from the farmyard wastes.