[Wheat response to zinc and copper application]
1989
Amin, R. | Zia, M.S. | Ali, A. (National Agricultural Research Center, Islamabad (Pakistan))
An experiment was conducted in a split plot design with three replications in 1981/82 season on deep, non calcareous, permeable, Mingora silt loam soil, with ochric epipedon and cambic B horizon using the wheat variety Pak-81. Zn was applied at the rates of 0, 1.0, 2.0, and 4.0 kg/ha; Cu at 0, 1.25, and 2.50 kg/ha; and basal application of nitrogen and phosphorus at 120 and 40 kg/ha, respectively. Wheat grain and straw yields were significantly affected by Zn application. The highest grain and straw yields were obtained with the addition of 4.0 and 2.0 kg Zn/ha. Cu application significantly increased straw yield in the 1.25 kg Cu/ha treatment. Zn concentration and uptake in grain and straw increased with the Zn application rate at the various Cu levels, but were generally higher at the higher Cu rates. Zn concentration in straw was much lower than in grain. The highest total Zn uptake was recorded when the highest rates of Zn and Cu were applied together. Cu concentration and uptake in grain and straw generally decreased as Zn application rate was increased, but increased when Cu was added. Cu concentration in straw was much lower than in grain. Maximum total Cu uptake was recorded at the highest rate of Cu with no Zn addition.
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