Zinc availability in calcareous soils. II. Relation between available zinc and response to zinc fertilization
Navrot, J.; Ravikovitch, S.
Soil Sci 105: 184-189
In greenhouse experiments with maize grown in rendzinas and calcareous loess soils, highly significant correlations were found between Zn uptake and amounts of Zn extracted from soil by KC1 (r = 0.747), NH4NO3 (r - 0.789) and Na2DP, di-sodiura ethylenediamine di (O-hydroxyphenyl) acetate (r = 0.960). Corresponding boundary values of extractable Zn for response or non-response to Zn fertilizers were 0.20, 0.25 and 1.0 ppm; differentiation between the two soil categories was easier with Na2DP.