Copper fertilization of wheat on soils with marginal copper levels
Date
2003-02-18
Authors
Flaten, P.L.
Karamanos, R.E.
Walley, F.L.
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Abstract
Copper (Cu) is the micronutrient most often deficient in Saskatchewan. Fertilizer placement is an
important consideration, particularly in minimum tillage systems, because Cu is generally
thought of as immobile in soil. Several new products and methods of application have become
available since the last local research was completed in the mid-eighties. This study was
conducted to identify relative effectiveness, as indicated by response of hard red spring wheat
(Triticum aestivum L. cv. AC Barrie) to a variety of Cu fertilization strategies on mineral soils
having low levels of available Cu. Field experiments at five Saskatchewan sites over three years
compared the effect of Cu treatment on wheat yield, tissue and grain Cu concentration, thousand
kernel weight and grain Cu accumulation. The ranking of Cu fertilization method from most to
least effective, was: foliar Cu (sulphonate) at Feekes 6 or 10 > broadcast and incorporated Cu
sulphate at 5.5 kg ha-1 or 11 kg ha-1 > broadcast Cu sulphate with no incorporation. Broadcast Cu
oxysulphate was ineffective, particularly without incorporation. Seed placed Cu sulphate or
oxysulphate were also ineffective. Where Cu deficiencies are confirmed, foliar application of Cu
products are recommended for response of wheat within the year of application.
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Keywords
Cu fertilizer management, micronutrient, direct seeding, Cu fertilizer placement
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Soils and Crops Workshop