Premium
Nitrification Inhibitor with Fall‐applied vs. Split Nitrogen Applications for Winter Wheat 1
Author(s) -
Boswell F. C.,
Nelson L. R.,
Bitzer M. J.
Publication year - 1976
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/agronj1976.00021962006800050013x
Subject(s) - nitrification , agronomy , ultisol , nitrogen , ammonium sulfate , fertilizer , ammonium , grain yield , field experiment , chemistry , soil water , zoology , mathematics , environmental science , biology , soil science , organic chemistry , chromatography
Since numerous small grain producers desire to make fall application of efficient levels of N for maximum yields, studies are needed to determine the efficiency of fall‐applied N (with and without an inhibitor) vs. split N applications. Field studies were conducted at two locations each year over a 3‐year period with the objective of evaluating the response of wheat ( Triticum aestivum L.) to N rates, time of application, and effect of a nitrification inhibitor on soils of different characteristics (Typic Hapludult and Typic Paleudult). Yields, tissue concentrations of various elements, grain analyses, and soil NH 4 ‐ and NO 3 ‐N were evaluated. Splitting the N, 28 kg/ha in the fall and 56 kg/ha topdressed in the spring, was superior to applying all the N in the fall. The inclusion of the nitrification inhibtor, 2‐chloro‐6‐(trichloromethyl) pyridine (N‐Serve), with ammonium sulfate in the fall at the rate of 84 kg/ha did not influence yields or N levels in the tissue or grain. The inhibitor had no effect on elements other than N. Although the nitrification inhibitor influenced the retention of the NH 4 ‐N in the soil until the January sampling, this retention was not evident for either soil at the March sampling. Therefore, we concluded that the N applied as a part of the complete fertilizer at the rate of 28 or even 84 kg/ha in the fall is inadequate for maximum wheat yield in either the coastal plain or piedmont regions of Georgia. A nitrificaton inhibitor applied with the ammonium sulfate was ineffective in preventing nitrification of the ammonium nitrogen or to increase yields.