Effect of zinc x boron interaction on plant growth and tissue nutrient concentration of corn

A pot experiment was conducted in a greenhouse on a calcareous soil (fine, mixed, mesic, Fluventic Haploxerepts) to study the interaction of zinc (Zn) and boron (13) on the growth and nutrient concentration of corn (Zea mays L.). Treatments consisted of a factorial arrangement of seven levels of B (0, 2.5, 5, 10, 20, 40, and 80 mg kg(-1) as boric acid), two sources of Zn [zinc sulfate (ZnSO4 center dot 7H(2)O) and zinc oxide (ZnO)], and three levels of Zn (0, 5, and 10 mg kg(-1)) in a completely randomized design with three replications. Plants were grown for 70 d in 1.6 L plastic containers. Applied Zn significantly increased plant height and dry matter yield (DMY) of corn. Source of Zn did not significantly affect growth or nutrient concentration. High levels of B decreased plant height and DMY. There was a significant B x Zn interaction on plant growth and tissue nutrient concentration which were rate dependent. In general, the effect of B x Zn interaction was antagonistic on nutrient concentration and synergistic on growth. It is recommended that the plants be supplied with adequate Zn when corn is grown in high B soils, especially when availability of Zn is low.