Spreading manure is usually done before the planting of new crops during the winter season. Manure is an excellent fertilizer as it contains nitrogen, phosphorus, potassium and other nutrients. Nutrient values of manures vary greatly and depend on many factors including type of animal, age, feed, bedding, collection and storage system, time and means of application, etc. However overuse of nitrogen bearing fertilizers is said to lead to nitrate contamination of water resources such as ground waters, rivers and lakes.
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