Abstract
The effect of sodium humate on the development of tomato seedlings in aerated and non-aerated water cultures has been compared with the effect of colloidal solutions of agar-agar. Similar comparisons have been made between the activities of humate and EDTA. The experiments have been conducted in fresh media as well as in nutrient solutions that had been formerly used for growing other tomato seedlings. Finally, a comparison between effects of humate and EDTA on tomato seedlings growing in nutrient solutions with various con centrations of calcium, magnesium, and iron salts in aerated and non-aerated water cultures has been carried out. Media used for growth experiments have been tested microbiologically, and qualitative analyses of their organic com pounds have been made. A distinct relationship between physiological activities of humate, EDTA, and the concentrations of calcium, magnesium, and iron cations in the medium has been found. It has also been shown that in non-aerated media the plants mostly suffer the deficiency of available iron; this is prevented by the addition of either humate or EDTA.
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