Efectos del manejo hortícola intensivo en los niveles, distribución y disipación de lindano en suelos y plantas de una región semiárida (Argentina)
2008
We checked if soils under intensive horticultural use for several decades show the
effects of the input of pesticides containing lindane, and the levels in plants attacked by a plague. For
this purpose, we have analyzed the lindane content in soils from 44 sites (located in the Bahia Blanca
horticultural area, Argentina), at different depths (0-5, 5-10 and 10-20 cm), with different age in horticultural
management, as well as plants grown in these soils that were sprayed with pesticides before the attack a
pest. Results indicate high concentrations (between 59 and 1590 μg g-1), especially in the surface layer of
soils studied, as well as those whose horticultural use is more recent.
For all studied soils, negative correlation has been established between the lindane content,
the age of the horticultural use, the organic matter content and pH. However, in the deeper
layers that content is correlated, and positively, only with the age of horticultural use. These
relationships indicate that lindane is immobilized in semi-arid conditions, and is adsorbed on
soil organic matter.
The leaves of Beta vulgaris, L., sampled in these soils and in supermarkets supplied by
farmers from the area, contain high amounts of lindane (reaching up to 15 μg g-1); although the
lindane dissipation curves in them indicate that it disappears after 6 days of making the input of
pesticides, indicating the minimum security before marketing.
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