N Response of No-Till Dryland Winter Triticale Forage

Triticale's forage-yield response to fertilizer nitrogen (N) is impressive on soils testing low in available N. Our objectives were to (1) quantify the forage-yield response of dryland winter triticale to applied N and residual nitrate N and (2) fit the yield data to a regression equation based...

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Bibliographic Details
Published in:Communications in Soil Science and Plant Analysis Vol. 47; no. 9; pp. 1117 - 1127
Main Authors: Vigil, Merle F., Poss, David J.
Format: Journal Article
Language:English
Published: Philadelphia Taylor & Francis 14.05.2016
Taylor & Francis Ltd
Subjects:
Agricultural research
Agricultural Research Service
arid lands
Arid zones
biomass
direct seeding
equations
Fertilizers
forage
grain yield
Great Plains region
millets
nitrate nitrogen
nitrates
Nitrogen
nitrogen fertilizers
no-till
no-tillage
planting
Residual soils
soil
Soil testing
spring
stubble
triticale
Triticum aestivum
Urea
urea nitrogen
wheat
Winter
USA, Great Plains
USA
Great Plains region
ISSN:0010-3624, 1532-2416, 1532-2416, 1532-4133
Online Access:Get full text
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Summary:Triticale's forage-yield response to fertilizer nitrogen (N) is impressive on soils testing low in available N. Our objectives were to (1) quantify the forage-yield response of dryland winter triticale to applied N and residual nitrate N and (2) fit the yield data to a regression equation based on both applied N and residual soil nitrates and use the fitted equation to calculate economic optimum N rates for this crop (EONR). Winter triticale was direct seeded no-till into wheat or millet stubble for four site years at the United States Department of Agriculture, Agricultural Research Service (USDA-ARS) Central Great Plains Research Station. In each experiment (1995, 2007, 2009 and 2010) just prior to planting, the soil was sampled for nitrate-N. Replicated field plots were top-dressed with 0, 22, 34, 67, 90, 101 or 135 kg of N fertilizer per ha as urea-N. Yield and total biomass N was then measured in each plot in late spring each year. A relative yield N response equation, fitted to all four years of data, was able to explain 93% of the variability in yield. That equation provided reasonable EONR estimates that matched 87% of the EONRs calculated for individual years.
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ISSN:0010-3624
1532-2416
1532-2416
1532-4133
DOI:10.1080/00103624.2016.1166239