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    Late Season Water and Nitrogen Effects on Durum Quality, 1995 (Final)

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    Author
    Ottman, M. J.
    Doerge, T. A.
    Martin, E. C.
    Issue Date
    1996-10
    Keywords
    Agriculture -- Arizona
    Grain -- Arizona
    Forage plants -- Arizona
    Barley -- Arizona
    Wheat -- Arizona
    Barley -- Nitrogen fertilizer
    Wheat -- Nitrogen fertilizer
    Barley -- Water
    Wheat -- Water
    Barley -- Growth regulators
    Wheat -- Growth regulators
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Forage and Grain: A College of Agriculture Report
    Abstract
    Durum grain quality is affected by many factors, but water and nitrogen are factors that the grower can control. The purpose of this research was to determine 1) the nitrogen application rate required at pollen shed to maintain adequate grain protein levels if irrigation is excessive or deficient during grain fill and 2) if nitrogen applications during grain fill can elevate grain protein. Field research was conducted at the Maricopa Agricultural Center using the durum varieties Duraking, Minos, and Turbo. The field was treated uniformly until pollen shed when nitrogen was applied at rates of 0, 30, and 60 lbs/acre. During grain fill, the plots were irrigated based on 30, 50, or 70% moisture depletion. In a separate experiment, nitrogen fertilizer was applied at a rate of 30 lbs N/acre at pollen shed only, pollen shed and the first irrigation after pollen shed, and pollen shed and the first and second irrigation after pollen shed. Irrigation had no effect on grain protein level, although increasing nitrogen rates at pollen shed from 0 to 30 and 30 to 60 lbs N/acre increased protein by 1 percentage point. Nitrogen fertilizer application at the first irrigation after pollen shed increased grain protein content from 10.4 to 11.4% and application at the first and second irrigation after pollen shed increased grain protein content further to 11.9% averaged over varieties. Irrigation management during grain fill may not play as large a role in controlling grain protein content as was originally thought except perhaps on heavy soils, and nitrogen fertilizer application during grain fill may not be too late to increase grain protein content.
    Series/Report no.
    370106
    Series P-106
    Collections
    Forage & Grain Report 1996

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