Comparison of DTPA and resin extractable soil Zn to plant Zn uptake

Hamilton, Mark A.; Westermann, D. T.

doi:10.1080/00103629109368435

Cited by 9 publications

(1 citation statement)

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“…This confirms the observations made by Leggett and Westermann (1986). Soil Zn extracted by a resin was shown to be linearly related to DTPA-extractable Zn, but better related to Zn uptake than DTPA (Hamilton and Westermann, 1991). The resin may be extracting some labile Zn not extracted by the DTPA.…”

Section: Discussionsupporting

confidence: 79%

Factors Affecting Zinc Uptake in Cropping Systems

Hamilton¹,

Westermann²,

James

1993

Soil Science Soc of Amer J

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Zinc availabilities can change with different cropping management practices. The objective of this study was to identify some of the causative factors associated with previous crops contributing to Zn uptake differences in a subsequent crop. Field studies over 3 yr evaluated the Zn availability after four precropping treatments: bean (Phaseolus vulgaris L.), corn (Zea mays L.), wheat (Triticum aestivum L.), and fallow, across two Zn fertilization rates (with and without 11 kg Zn ha-' as ZnSO4), using the 'Viva' bean as a test crop. Soil samples taken before and after the test crop were analyzed for extractable P, Zn, Cu, Mn, and Fe, and organic matter. Soil respiration during the test crop was periodically estimated the last cropping year. Whole plant samples estimated nutrient concentration and uptake. Soil Zn extracted by diethylenetriaminepentaacetic acid (DTPA) was increased by Zn fertilization but not affected by precropping treatments. Zinc uptake by bean was significantly higher after precropping with corn and lower after fallow regardless of Zn fertilization. Uptake differences were most pronounced during early plant growth. Phosphorus and Cu uptake varied with treatment in a similar pattern as Zn uptake, and were positively correlated with each other. Zinc uptake was also positively correlated with soil organic matter and negatively correlated with soil P. Soil respiration rate was significantly lower after the fallow treatment compared with other precropping treatments. Vesicular-arbuscular mycorrhiza (VAM) colonization in the test crop roots was higher after corn and lower after fallow regardless of soil Zn concentrations. Colonization was positively cor-M.A. Hamilton, INEL, EG&G ID,

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Section: Discussionsupporting

confidence: 79%