Summary
Labile pool, selective distribution coefficient and adsorption maxima of zinc were measured. Labile pool decreased while selective distribution coefficient increased with increasing depth in all soil profiles. The values of adsorption maxima of zinc corresponded to selective distribution coefficient. The relative efficiency of four extractantsviz 0.05M CA(NO3)2 0.1M Mg(NO3)2; 0.01M EDTA−NH4OAc and 0.005M DTPA-triethanolamine mixture in predicting the availability of native soil zinc to apple was tested. The correlation study indicated that all extractants are good index of zinc availability to apple trees. DTPA-extractable zinc is as efficient as its labile pool(E-value) in predicting the availability of native soil zinc to apple trees. This study also suggested that soil profile should be sampled upto a depth of 30–60 cm for providing a better prediction of availability of native soil zinc to apple trees.
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Ganai, R., Sinha, M.K. & Prasad, B. Parameters of availability of zinc in orchard soils in relation to zinc nutrition of apple. Plant Soil 66, 91–99 (1982). https://doi.org/10.1007/BF02203406
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DOI: https://doi.org/10.1007/BF02203406