— Effects of 2 Zn sources (ZnEDTA and ZnS0 4 ) and 4 Zn levels on the growth and Zn utilization by maize plants in 2 arid calcareous soils of Iran were investigated in a glasshouse study. Plants supplied with Zn produced more stem and leaf dry weights and contained more Zn than those grown without Zn. Moreover, ZnEDTA was generally more effective than ZnS0 4 in increasing Zn concentration and Zn uptake by stems and leaves. Results of this study indicate that the soils exhibited a highly variable capacity with regard to the growth and Zn accumulation. Maize seedlings grown in the Bajgah soil produced more dry matter yields and absorbed more Zn than those grown in the Airport soil. The more enhancing influence of ZnEDTA over ZnS0 4 in terms of growht and Zn utilization by maize in arid region calcareous soils might be due to less fixation and greater transport and movement of chelated Zn to plant roots.
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Maftoun et al. (1989) studied this question.