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Acta Horticulturae
Silber, A., Institute of Soils, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, P. O. Box 6, Bet Dagan, 50250, Israel
Raviv, M., Department of Ornamental Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P. O. Box 1021, Ramat Yishai 30095, Israel
The objective of this study was to determine the effects of disinfestation treatments on the chemical properties of tuff. The desorption and the solubilization characteristics of two tuff media, one original unused and one in which roses had been grown for 8 years, were examined before and after two different disinfestation treatments: (i) fumigation with 0.5% metham sodium; and (ii) solarization for 40 days. The disinfestation process per se did not affect the solid phase or the stability of tuff, but significantly affected the solubilization of organic matter and of the low-molecular-weight fulvic acid content. Total and soluble carbon contents in the new tuff were negligible, but the growing of roses enhanced the accumulation of organic compounds in the substrate. The soluble organic compounds released during disinfestation were adsorbed later by the tuff surface, thereby changing its surface charge. As a result, the disinfested used tuff became more negative, and the quantities of Ca, Mg and K adsorbed on the surfaces increased. The increased quantities of cations adsorbed on the surfaces subsequently caused increased concentrations in tuff extracts, because of displacement by the extraction solutions. In addition, the solubilization of organic compounds significantly increased the N-NO3 concentrations. Thus, beyond the beneficial effects on the pathogen population, the disinfestation treatments enhanced nutritional element availability. In the absence of organic matter in the new unused tuff, the effects of the disinfestation treatments were insignificant and the titration curves, as well as the releases of Al, Si, P, K, Ca and Mg from the disinfested tuff were identical to those of the original material.
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Disinfestation effects on the chemical properties of tuff
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Silber, A., Institute of Soils, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, P. O. Box 6, Bet Dagan, 50250, Israel
Raviv, M., Department of Ornamental Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P. O. Box 1021, Ramat Yishai 30095, Israel
Disinfestation effects on the chemical properties of tuff
The objective of this study was to determine the effects of disinfestation treatments on the chemical properties of tuff. The desorption and the solubilization characteristics of two tuff media, one original unused and one in which roses had been grown for 8 years, were examined before and after two different disinfestation treatments: (i) fumigation with 0.5% metham sodium; and (ii) solarization for 40 days. The disinfestation process per se did not affect the solid phase or the stability of tuff, but significantly affected the solubilization of organic matter and of the low-molecular-weight fulvic acid content. Total and soluble carbon contents in the new tuff were negligible, but the growing of roses enhanced the accumulation of organic compounds in the substrate. The soluble organic compounds released during disinfestation were adsorbed later by the tuff surface, thereby changing its surface charge. As a result, the disinfested used tuff became more negative, and the quantities of Ca, Mg and K adsorbed on the surfaces increased. The increased quantities of cations adsorbed on the surfaces subsequently caused increased concentrations in tuff extracts, because of displacement by the extraction solutions. In addition, the solubilization of organic compounds significantly increased the N-NO3 concentrations. Thus, beyond the beneficial effects on the pathogen population, the disinfestation treatments enhanced nutritional element availability. In the absence of organic matter in the new unused tuff, the effects of the disinfestation treatments were insignificant and the titration curves, as well as the releases of Al, Si, P, K, Ca and Mg from the disinfested tuff were identical to those of the original material.
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