Premium
Potato Response to a Polymer‐Coated Urea on an Irrigated, Coarse‐Textured Soil
Author(s) -
Wilson Melissa L.,
Rosen Carl J.,
Moncrief John F.
Publication year - 2009
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2008.0192x
Subject(s) - fertigation , loam , leaching (pedology) , urea , coated urea , agronomy , nitrate , ammonium nitrate , chemistry , growing season , ammonium , petiole (insect anatomy) , irrigation , horticulture , environmental science , soil water , biology , botany , soil science , hymenoptera , organic chemistry
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.