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- W1991664114 abstract "Controlled release fertilizers, especially polymer‐coated urea (PCU), have been shown to reduce nitrate (NO 3 ) leaching while maintaining potato ( Solanum tuberosum L.) yields, but cost has been prohibitive. A new type of PCU (Environmentally Smart Nitrogen, Agrium, Inc., Calgary, AB) is less costly than previous PCUs, but its effectiveness on potato production has not been extensively studied. A 2‐yr field study was conducted on loamy sand to evaluate the effect of this PCU on Russet Burbank tuber yield and to determine if it is economically comparable to soluble N sources. Several N rates of PCU applied at emergence were compared with two split applications of soluble N at equivalent rates. Additional treatments examined N application timing of PCU and a fertigation simulation with urea/ammonium nitrate. Petioles and midseason soil samples were collected to determine N status during the season. Overall, PCU and soluble N at equivalent N rates were found to have similar total and grade A yields and net monetary returns. The optimal N rate that resulted in maximum net returns was 251 and 236 kg N ha −1 as soluble N and PCU, respectively. Petiole NO 3 concentrations were typically higher with soluble N early in the season and higher with PCU later in the season. Soil NO 3 determined in samples collected in late June was found to be a better predictor of yield and potential N need than those collected in mid‐ to late July. Overall, PCU may reduce or eliminate the need for split applications of N on coarse‐textured soils." @default.
- W1991664114 created "2016-06-24" @default.
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- W1991664114 date "2009-07-01" @default.
- W1991664114 modified "2023-10-05" @default.
- W1991664114 title "Potato Response to a Polymer‐Coated Urea on an Irrigated, Coarse‐Textured Soil" @default.
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- W1991664114 doi "https://doi.org/10.2134/agronj2008.0192x" @default.
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