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Most fertilizer is applied before planting.
2 O 5 is applied before planting. Anhydrous Ammonia Anhydrous ammonia is the nitrogen fertilizer of choice in the fall for spring crops in the US, but consumption was down this past fall. Most all that could happen dry soils, wet soils and frozen soils did happen and affected ammonia application. Dry fertilizer application was less affected. With the early harvest, urea, DAP and potash application was favorable.