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The effect of sodium humate on the content of different types of phosphorus compounds and on the activity of acid phosphatases in tomato seedlings



The effect of sodium humate on the content of different types of phosphorus compounds and on the activity of acid phosphatases in tomato seedlings



Acta Societatis Botanicorum Poloniae 53(3): 385-398



The effect of sodium humate on the level of some fractions of P compounds in the leaves and roots of tomatoes cultured in mediums with a full or reduced P dose was studied. Dependence was found between the presence of humate in the medium and an increase in the amount of some organic P compounds in the leaves (lipid P, easily hydrolyzed P compounds, nucleic acid P). In addition, humate lowered the activity of acid phosphatases which had been excessively increased due to the plants inadequate phosphate supply. Na-humate affects P metabolism not only in an indirect manner, but also directly through penetration of humic substances into the plant tissues.

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