Clay fixation of metal chelates as a factor in their usability by soil application to correct micronutrient deficiencies

Wallace, G. A.; Wallace, A.

doi:10.1080/01904168309363106

Cited by 8 publications

(3 citation statements)

References 10 publications

(11 reference statements)

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“…However, the correction took 2 years to occur when the Zn was disked into the soil and more than four years if left on the soil surface. Chelating agents have been shown to improve solubility or uptake of micronutrients from the soil, especially in alkaline soils (Burt et al, 1995;Cadahia et al, 1988;Wallace and Wallace, 1983). Single applications of either 1.5 or 3 lb (0.7 or 1.4 kg) of Zn sulfate dissolved in water and sprinkled around individual trees during the late dormant stage did not significantly increase leaf Zn concentrations in pistachios (Brown and Zhang, 1997).…”

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confidence: 99%

Leaf Zinc and Copper Concentrations of Mature Pistachio Trees in Response to Fertigation

Kallsen¹,

Holtz²,

Villaruz³

et al. 2000

horttech

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Mature `Kerman' pistachio (Pistacia vera L.) trees, located on the west side of the San Joaquin Valley of California on an alkaline clay-loam soil, were fertigated in 1997 and 1998 with three combinations of zinc (Zn) and copper (Cu) sulfate. Seasonal applications of Zn and Cu were injected at three separate times starting in spring and ending in summer. Efficacy of the treatments were compared by measuring the concentration of Zn and Cu in leaf tissue. Fertigated treatments were compared to trees receiving no supplemental Zn or Cu and to trees receiving a single foliar treatment of Zn and Cu each year. Soil Zn and Cu concentrations increased in the fertigated plots. Plots receiving the highest rates of Zn and Cu showed the greatest increase. However, at the recommended August leaf sampling period, only the foliar treated pistachio trees showed a significant increase in leaf Zn and Cu. The results demonstrate that after two seasons, a foliar application of Zn and Cu in April, two to three weeks after flowering, increased leaf-tissue concentrations of Zn and Cu to sufficiency levels. These foliar applications were more effective than fertigating with Zn and Cu sulfate.

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confidence: 99%

Leaf Zinc and Copper Concentrations of Mature Pistachio Trees in Response to Fertigation

Kallsen¹,

Holtz²,

Villaruz³

et al. 2000

horttech

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“…Many naturally occurring soil organic compounds as well as synthetic chelators, are bound by soil clays, oxides and mineral surfaces, preventing their downward movement in the soil. Mechanisms proposed for the binding include oxygen bonds, cation bridges and chelated metal bridges (36). If oxygen bonds or other cations are providing bonding to clay sites, then chelated radionuclides should be expected to be accessible for uptake into plants.…”

Section: Strategy For In Situ Phytoremediation Of Radionuclide Contammentioning

confidence: 99%

Phytoremediation and Reclamation of Soils Contaminated with Radionuclides

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Watrud

Manasse

et al. 1997

Phytoremediation of Soil and Water Contaminants

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“…Frequently, the effectiveness of chelates is low, because they can be retained or destroyed by soil materials (Wallace and Wallace, 1983). According to Assaad and Awad (1981), the degree to which a chelate is fixed by the solid phase of soil is affected extensively by the chelating agent type, the soils specific surface and the lime content.…”

Section: Introductionmentioning

confidence: 99%