SOIL ORGANIC-MATTER COMPOSITION AND PESTICIDE BONDING IN SANDY SOILS IN RELATION TO GROUNDWATER PROTECTION IN THE NORTHWEST GERMAN LOWER PLAIN

Citation
L. Beyer et al., SOIL ORGANIC-MATTER COMPOSITION AND PESTICIDE BONDING IN SANDY SOILS IN RELATION TO GROUNDWATER PROTECTION IN THE NORTHWEST GERMAN LOWER PLAIN, Biology and fertility of soils, 23(3), 1996, pp. 266-272
Citations number
44
Categorie Soggetti
Agriculture Soil Science
ISSN journal
01782762
Volume
23
Issue
3
Year of publication
1996
Pages
266 - 272
Database
ISI
SICI code
0178-2762(1996)23:3<266:SOCAPB>2.0.ZU;2-1
Abstract
In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pe sticides has been observed. We therefore examined data on microbial ac tivity and soil organic matter composition by wet chemistry, cross-pol arization magic-angle spinning and C-13 nuclear magnetic resonance, an d pyrolysis-field ionization mass spectromy. However, neither microbia l activity nor the soil organic matter composition of cultivated tapso ils explained the differences in xenobiotic leaching into the groundwa ter Data from Anthrosols suggested that these soils oc have a higher c apacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and lime of application, the leached output fro m these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to as sess fixation capacity and desorption kinetics in Bh horison seem warr anted.