Abstract
AbstractCorn was grown on two soils in greenhouse experiments to determine the relative efficiency of various Zn sources at different levels of lime and P applications. Plant deficiency symptoms, growth, (oven‐dry weight of corn tops), height, Zn content, and Zn uptake were evaluated.Corn growth was increased by Zn fertilization on both soils. No differences were found among the Zn sources on the Red Bay soil where only a slight response to Zn was obtained. Increases in growth up to 154% were obtained from Zn fertilization on the Norfolk soil. ZnSO4 was slightly more effective than ZnO or Zn chelate and organic (polyflavonoid) Zn was the least effective source. ZnSO4 and ZnO were equally efficient or superior to chelate and organic Zn in increasing the Zn content and uptake of corn on the basis of amounts used.Liming resulted in decreased corn growth, plant Zn content, and Zn uptake, especially when no Zn was applied. High P fertilization decreased the Zn content of corn but tended to increase growth when applied with Zn.
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