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dc.contributor.authorLong, Dan S.
dc.contributor.authorWhitmus, Jeffrey D.
dc.contributor.authorEngel, Richard E.
dc.contributor.authorBrester, Gary W.
dc.date.accessioned2015-10-23T20:38:06Z
dc.date.available2015-10-23T20:38:06Z
dc.date.issued2015-04
dc.identifier.citationLong, Dan S., Jeffrey D. Whitmus, Richard E. Engel, and Gary W. Brester. "Net Returns from Terrain-Based Variable-Rate Nitrogen Management on Dryland Spring Wheat in Northern Montana." Agronomy Journal 107, no. 3 (April 2015): 1055-1067. DOI: 10.2134/agronj14.0331.en_US
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/9345
dc.description.abstractAgricultural producers can use variable-rate application technology to vary N fertilizer within fields. This study was conducted to estimate changes in net returns from implementation of variable-rate N management (VNM) on hard red spring wheat (Triticum aestivum L.) in a summer-fallow region in northern Montana. Net return from uniform N management (UNM) traditionally used by producers was compared with that from VNM in eight dryland fields between 1994 and 2004. Field experiments consisted of a replicated series of four to six N rates applied within strips oriented with the length of each field. Management zones (MZs) were created by dividing the fields into upper slopes, south-facing middle slopes, north-facing middle slopes, and lower slopes. Nitrogen recommendations for MZs were based on soil N testing and expected yields. Grain yield data were obtained using a production-size combine equipped with a yield monitor. Mean grain protein and yield were similar between VNM and UNM. Yield differences were <223 kg ha–1 and averaged only 18 kg ha–1. Grain yield did not differ significantly among N rates within MZs. In seven of the eight sites, net returns from VNM were up to US$27.97 ha–1 less than from UNM and were not profitable if Environmental Quality Incentive Program payments of US$6.36 ha–1 were considered as part of net income. Little evidence existed that VNM based on constructed MZs and predetermined N recommendations improves grain yields and profits or reduces N use in water-limited, summer-fallow systems of northern Montana.en_US
dc.description.sponsorshipMontana Wheat and Barley Committee;Montana Fertilizer Tax Fund Advisory Committee; Westco Fertilizers; and USDA-IFAFS (Grant no. 2001-52103-11321)en_US
dc.language.isoen_USen_US
dc.titleNet Returns from Terrain-Based Variable-Rate Nitrogen Management on Dryland Spring Wheat in Northern Montanaen_US
dc.typeArticleen_US
mus.citation.extentfirstpage1055en_US
mus.citation.extentlastpage1067en_US
mus.citation.issue3en_US
mus.citation.journaltitleAgronomy Journalen_US
mus.citation.volume107en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.identifier.doihttps://dx.doi.org/10.2134/agronj14.0331en_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentAgricultural Economics & Economics.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.data.thumbpage4en_US


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