Abstract
SypnosisSub‐surface (drilled) placement of ammonium nitrogen produced better growth and yields of lowland rice than similar nitrogen applied on the soil surface (broadcast). Nitrogen content of rice plants and percentage recovery of the applied nitrogen also increased. Ammonium nitrogen drilled 2 to 4 inches into the soil, where reducing conditions developed 3 to 5 days after flooding, remained in the soil and was available to lowland rice. Surface nitrogen, applied by broadcast methods, did not promote the best growth of rice. Losses of surface applied nitrogen apparently occurred through processes of nitrification and subsequently denitrification.
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