Residues of triazine herbicides in a vineyard after a long-term application
DOI:
https://doi.org/10.5073/vitis.1981.20.329-334Abstract
In an experimental vineyard of Attica, where triazine herbicides (atrazine and simazine) were applied yearly since 1965 in annual doses of 5 kg a.i./ha, determinations of herbicide residues in the soil were made with a sensitive bioassay.
Determinations after 6, 9 and 14 years of application have shown that no significant accumula,tlon of atrazine or simazine is observed in the soil layers of 0-10 cm and 10-20 cm.
The detected quanfüy of herbicides has never overpassed the 2 kg a.i./ha which is 40 % of the annually applied dose. '
The influence of temperature and moisture on the degradation of herbicide was also studied. It was found that, when only one of the two factors is favourable, the degradation of atrazine is slow.
Herbicides triazine résiduaires dans un vignoble après application à long terme
Dans un vignoble expérimental de la région d' Attique, où depuis 1965 on emploie régulièrement les herbicides atrazine et simazine à une dose annuelle de 5 kg m.a./ha, nous avons mesuré les résidus dans le sol au moyen d'un test biologique.
Ces mesures ont montré qu'après 6, 9 et 14 ans d'application continue l'accumulation de l'atrazine ou de la simazine est faible dans les couches de sol de 0--10 cm et de 10--20 cm.
La quantité de l'herbicide décelée ne dépassait pas les 2 kg m.a./ha ou les 40 % de la dose annuelle appliquée.
Nous avons étudié aussi l'influence de l'humidité et de la température sur la dégradation de l'atrazine; nous avons observé qu'elle est faible dans les cas où seulement l'un des deux facteurs est favorable.
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