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Effects of Humate, Agar-agar, and EDTA on the Development of Tomato Seedlings in Aerated and Non-aerated Water Cultures
S. GUMIŃSKI, Z. GUMIŃSKA and J. SULEJ
Journal of Experimental Botany
Vol. 16, No. 46 (January 1965), pp. 151-162
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23686775
Page Count: 14
You can always find the topics here!Topics: Nutrient solutions, Plants, Seedlings, Plant growth, pH, Plant roots, Calcium, Humus, Seedling culture, Hypochromic anemia
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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 concentrations 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 compounds 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.
Journal of Experimental Botany © 1965 Oxford University Press