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- W2034784715 abstract "Abstract Conventional methods of N application to winter wheat often lead to low fertilizer‐use efficiency. Point injection may improve fertilizer efficiency but the optimum time of application has not been established. A field experiment was conducted during two growing seasons at Lethbridge, AB, Canada, on a Typic Haploborall sandy clay loam to determine 15 N‐fertilizer uptake as a function of application time and method. The experiment included a factorial of three methods (point‐injected urea‐NH 4 NO 3 , broadcast urea, and broadcast NH 4 NO 3 ,) and four application times (at seeding, late fall, early spring, and late spring) along with two banding treatments (urea and NH 4 NO 3 ) applied at seeding and a control. For all methods of application, efficiency of fertilizer tended to be highest when applied in early spring. In the point‐injection treatments, average recovery of applied N by wheat was 32% for the seeding, 43% for late fall, 56% for early spring, and 29% for late spring applications. At the optimum time of application, point injection exhibited significantly higher fertilizer recovery than broadcast applications, probably because of direct placement of N into the rooting zone. Fertilizer recovery from banding treatments applied at seeding was lower than from early‐spring point injection, presumably because of overwinter N losses. The results suggest that point injection can significantly enhance fertilizer‐use efficiency and that optimum time of injection is in the early spring just prior to the period of maximum N assimilation by the crop." @default.
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- W2034784715 date "1991-01-01" @default.
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- W2034784715 title "Uptake of Point-Injected Nitrogen by Winter Wheat as Influenced by Time of Application" @default.
- W2034784715 doi "https://doi.org/10.2136/sssaj1991.03615995005500010044x" @default.
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