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Sulfur‐Coated Urea and Uncoated Soluble Nitrogen Fertilizers for Fescue Forage 1
Author(s) -
Mays D. A.,
Terman G. L.
Publication year - 1969
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/agronj1969.00021962006100040001x
Subject(s) - urea , forage , coated urea , chemistry , nitrogen , agronomy , ammonium , sulfur , festuca arundinacea , ammonium nitrate , zoology , field experiment , poaceae , biology , biochemistry , organic chemistry
Field experiments were carried out during 1965–67 to compare rates, sources and times of N topdressing for ‘Kentucky 31’ fescue ( Festuca arundinacea ). Uncoated ammonium nitrate (AN), urea, and other readily soluble N fertilizers resulted in higher first‐cutting yields, which were higher in content of total N. Sulfur‐coated urea (SCU) resulted in lower first‐cutting and higher later‐cutting yields than did the soluble N sources. Total annual yields were usually similar with all N sources. Mixtures of AN and SCU or split applications of AN resulted in the most uniform seasonal growth and N content. Lower yields and apparent crop recovery of N from uncoated urea and urea ammonium phosphate (UAP) indicated lower efficiency of these urea‐containing N sources for topdressing, particularly at higher N rates. December, January, February, and March topdressing dates had rather similar effects on forage yields and N contents.