Effects of adding chelated and non‐chelated copper and cobalt to a deficient soil on the content of these nutrients in clover and ryegrass

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Abstract
In a pot trial carried out with a mineral‐deficient soil, applications of copper and cobalt significantly increased the content of these nutrients and manganese in ryegrass and clover. When used at the same rate of application of copper or cobalt, EDTA chelates were found to be no more effective than simple sulphates in increasing the copper and cobalt content. Low rates of application of copper‐EDTA produced insignificant increases in the copper content of herbage, and increases in cobalt content brought about by low application rates of cobalt‐EDTA were short lived. Incorporation of copper sulphate into the soil produced far larger increases in herbage copper concentration than copper sulphate applied to the soil surface.