Abstract
Since Zn availability to plants growing in a soil is governed by quantity, intensity, buffer power, rate of Zn desorption and diffusion, an improved understanding of a number of these factors in Vertisols would facilitate a more reliable prediction of crop requirements for Zn. The DTPA-extractable Zn, a quantity factor, together with initial Zn desorption rate coefficients, accounted for 80% of the variation in relative dry matter yield of wheat grown to anthesis. In combination with these factors, desorption (buffer) power explained 92% of the variation in Zn concentration in the young mature leaf blade (YMB) of wheat. Thus, the combination of the quantity, rate of Zn desorption and buffer power better predict growth responses of wheat to applied Zn in Vertisols than the commonly-used single extraction with DTPA alone (quantity), which provides only a static measure of Zn availability.
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Dang, Y.P., Dalal, R.C., Edwards, D.G. et al. Understanding zinc reactions in vertisols to predict zinc responses by wheat. Plant Soil 155, 247–250 (1993). https://doi.org/10.1007/BF00025030
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DOI: https://doi.org/10.1007/BF00025030