An update on the K oc concept in regard to regional scale management
Identifieur interne : 001197 ( Main/Curation ); précédent : 001196; suivant : 001198An update on the K oc concept in regard to regional scale management
Auteurs : Zev Gerstl [Israël]Source :
- Crop Protection [ 0261-2194 ] ; 2000.
Abstract
The normalization of soil sorption data to the soil organic matter content (SOM) produces a sorption constant, Koc, which is pesticide specific and independent of soil properties. Despite certain inherent problems with this constant, it has proven valuable in providing a tool for ranking pesticide leaching potential and for evaluating sorption properties where actual data is lacking. It cannot, however, provide reliable prediction of pesticide fate on the regional or catchment scale. The variability in Koc and SOM values and their effect on leaching indices is briefly reviewed. Several new and modern techniques such as GIS and GPS provide us with the means to map, and store in databases, the variability of SOM within fields and to implement site-specific pesticide application (Precision Agriculture) where the amount applied will be a function of the SOM. This mapping can then be used in regional scale management systems.
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DOI: 10.1016/S0261-2194(00)00085-5
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