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How effective is topdressed nitrogen in meeting crop requirements?

April 26, 2017CROP effective meeting nitrogen requirements

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How effective is topdressed nitrogen in meeting crop requirements?

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At best, broadcast N after seeding will only be as efficient as broadcast and incorporated N, or about 20% less effective than N placed below the soil surface (Table 1). However, N immobilization and “gassing off” loss processes may prevent this best case scenario from happening. Table 1.