Abstract
To obtain information on the magnesium-zinc relationship in wheat, we conducted a greenhouse experiment with four levels each of Zn (0, 5, 10, and 20 ppm) and Mg (0, 15, 30, and 60 ppm) using a Typic Ustipsamment. Response to Zn depended upon the Mg level. High levels of Mg depressed Zn response, which was partly overcome by high levels of Zn. Response to Mg was noted only when it was applied alone, up to 30 or 15 ppm, with low levels of Zn. Application of Mg increased Mg, Cu, and Fe, decreased Zn and K, and did not affect N and Ca concentrations. The concentrations of Mn and P also increased at low levels of Mg, but decreased at high levels of Mg. The uptake of all the nutrients, except Zn, increased with low levels of Mg, but decreased with high levels. The uptake of Zn decreased with increasing levels of Mg. Shoot Zn increased, whereas Fe, Mn, Cu, Mg, and P decreased, and N, Ca, and K concentrations were not affected with increasing levels of Zn. The uptake of P, Mg, Cu, and Mn was not affected, whereas uptake of N, K, and Ca increased at low levels of Mg. In general, Mg and Zn appeared to be antagonistically related.
Published Version
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