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17 November 2017 Comparing soluble to controlled-release nitrogen fertilizers: storage cabbage yield, profit margins, and N use efficiency
L.L. Van Eerd, J.J.D. Turnbull, C.J. Bakker, R.J. Vyn, A.W. McKeown, S.M. Westerveld
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Abstract

Optimizing N fertilizer applications involves maximizing N use efficiency (NUE) while minimizing losses but depends on complex interactions of crop, soil, weather, and management practices. One approach may be to use controlled-release fertilizer that synchronizes N availability with plant demand. A field experiment at two Ontario locations from 2007 to 2009 compared split-applied ammonium nitrate (ANs) to preplant-applied poly-coated urea (PCU) and soluble N at a ratio of 75:25 at five N rates on late-season storage cabbage (Brassica oleracea L. var. capitata). Maximum yield and profit margins were obtained at an average of 286 and >300 kg N ha-1, but few differences among sources were observed. Compared with ANs, PCU did not affect plant N content, nor did PCU reduce soil nitrate or NUE, which indicates little differences in risk of environmental N losses between N sources. Dissolution from mesh bags indicated 5%–25% of various PCU formulations remained by harvest but 5%–10% remained by spring, which suggests conservation over the winter, a need to synchronize N release with crop uptake, and partially explains the lack of treatment differences. From agronomic, economic, and environmental perspectives, the tested PCU treatments for cabbage production in a humid, temperate climate were equivalent to the standard practice.

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L.L. Van Eerd, J.J.D. Turnbull, C.J. Bakker, R.J. Vyn, A.W. McKeown, and S.M. Westerveld "Comparing soluble to controlled-release nitrogen fertilizers: storage cabbage yield, profit margins, and N use efficiency," Canadian Journal of Plant Science 98(4), 815-829, (17 November 2017). https://doi.org/10.1139/cjps-2017-0277
Received: 11 September 2017; Accepted: 31 October 2017; Published: 17 November 2017
JOURNAL ARTICLE
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KEYWORDS
cole crops
fertilizer (slow release)
urea (polymer coated)
vegetable
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