Potato response to a polymer-coated urea on an irrigated, coarse-textured soil

Melissa L Wilson, Carl J Rosen, John F. Moncrief

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Controlled release fertilizers, especially polymer-coated urea (PCU), have been shown to reduce nitrate (NO3) 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 NO3 concentrations were typically higher with soluble N early in the season and higher with PCU later in the season. Soil NO3 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.

Original languageEnglish (US)
Pages (from-to)897-905
Number of pages9
JournalAgronomy Journal
Volume101
Issue number4
DOIs
StatePublished - Jul 1 2009

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coarse-textured soils
potatoes
split application
urea ammonium nitrate
polymer-coated urea
slow-release fertilizers
application timing
fertigation
petioles
Solanum tuberosum
leaching
tubers
soil sampling
nitrates
sand

Cite this

Potato response to a polymer-coated urea on an irrigated, coarse-textured soil. / Wilson, Melissa L; Rosen, Carl J; Moncrief, John F.

In: Agronomy Journal, Vol. 101, No. 4, 01.07.2009, p. 897-905.

Research output: Contribution to journalArticle

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