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Most of the studies on the effect of humic acids on micronutrient uptake by plants has been carried out in nutrient solutions. Commercial companies have tried, without adequate experimental support, to extend the conclusions of these studies to the production of vegetables in agricultural soils. The effect of humic acids on micronutrient uptake by plants has been attributed' to (a) the improved supply of micronutrients to the soil solution caused by a higher rate of release from soil minerals (probably via chelate formation by humic acids) and (b) the improved uptake of micronutrients as consequence of the larger root system promoted by hormonal compounds in the humic acids. In soils with limiting concentration of micronutrients (such as some calcareous soils) and low content of organic matter, chelation of micronutrients by added commercial humic acids might increase their availability to plants. However, in agricultural soils with and adequate content of organic matter, no significant effect of commercial humic acids on micronutrient uptake by plants can be detected.

1031 EFFECT OF COMMERCIAL HUMIC ACIDS ON MICRONUTRIENT UPTAKE BY VEGETABLES