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Abstract
Wilson,
M.L., J.F. Moncrief, and C.J. Rosen. 2008. Kidney bean (Phaseolus vulgaris L.) production on an irrigated,
coarse-textured soil in response to polymer coated urea and tillage: I. Grain
yields, disease severity, and a simple economic analysis. JEMREST 5:41-56.
Kidney beans
(Phaseolus vulgaris L.) in Minnesota
are commonly grown on irrigated, coarse-textured soils that are susceptible
to nitrate leaching. A dense Bt layer that is present in these soils
restricts root growth and may increase severity of Fusarium root rot.
Anecdotal evidence from local growers suggests that breaking up the Bt layer
reduces the impact of root rot. This study was conducted to assess different
tillage depths and the use of polymer coated urea (PCU, Agrium U.S. Inc. and
WSPCU, Specialty Fertilizer Products) on grain yields, net monetary returns
and disease severity. The study was conducted over three years as a split
plot design. Whole plots were deep and shallow tillage (chisel plowed to an
average of 47 and 29 cm, respectively) while N treatments were subplots.
Three rates of PCU applied at emergence were compared with equivalent rates
of urea split applied at emergence and prebloom. Also, one rate of each
source, including WSPCU, was applied at planting and a 0 N control was
included. Differences between tillage depths were not found. Disease severity
was not significantly affected by tillage depths or N treatment. Emergence
applied PCU resulted in lower grain yields and monetary returns than split
urea applications. PCU applied at planting, however, resulted in similar
yields and monetary returns compared with split and planting urea, which
suggests a more optimal N regime for kidney bean production. Planting applied
WSPCU also resulted in similar yields and net returns as planting applied
urea.
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