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Availability of Ammoniacal Nitrogen to Lowland Rice as Influenced by Fertilizer Placement 1
Author(s) -
Mikkelsen D. S.,
Finfrock D. C.
Publication year - 1957
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1957.00021962004900060005x
Subject(s) - nitrogen , agronomy , ammonium , ammoniacal nitrogen , environmental science , nitrification , rice plant , denitrification , chemistry , biology , organic chemistry
Sypnosis Sub‐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.