Avaliação do lixiviado de imidazolinonas por meio de bioensaio

Abstract

The lixiviation of herbicides is the most common cause of contamination of subsuperficial water. The objective of this paper was to study the lixiviation of the herbicides imazamox e imazethapyr by means of bioessay. The herbicides were applied to several types of soil into PVC tubes, followed by the addition of 60 mm of water. In each column of soil, leached material was collected and transferred to vases filled with washed sand. Sorghum was sowed in these vases. After seventeen days, the aerial parts and the roots were collected, dried and submitted to a statistic investigation. The lixiviation of imazamox was smaller than that of imazethapyr. As far as types of soil were concerned, there was no difference among them concerning to dry matter weight of the aerial parts.