Pflanzenernährung, Wurzelleistung und Exsudation pp 196-204 | Cite as
Arylsulfatase-Aktivität im Kontaktraum Boden/Wurzeln bei Verschiedenen Landwirtschaftlichen Kulturpflanzen
Abstract
More than 95 % of the total S in most aerobic soils occurs as organic S compounds with three broad fractions identified: ester sulfate, C-bonded S and residual S. But organic S compounds are unavailable for plants and therefore must be converted to inorganic sulfate before uptake. The mechanisms involved in the mineralization of organic S compounds are still unknown. However, it seems that microorganisms are involved in this process. As a large proportion of the organic S compounds are ester sulfates, it may be expected that especially the turnover of these compounds may be important for the S nutrition of plants. For this reason we investigated the activity of the arylsulfatase in the close vicinity of the roots of different plant species and factors, which may control the release of sulfate by arylsulfatase. In total these informations are fundamental for developing improved predictions for crop S requirements.
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