The Effect of the Herbicides Simetone and Dcmu on Photosynthesis
نویسنده
چکیده
Recently, the subject was taken up by the first author, who confirmed the results about Simetone (VAN STEEKELENBURG, 1961) and extended them. The results described in the following sections are based upon this recent work. The substituted ureas and the symmetrical triazines are two special and important groups of herbicides. These compounds are taken up by the roots, transported via the xylem and accumulated in the leaves, where they inhibit photosynthesis. The best known compound of the triazine-group is Simazine: 2-chloro-4, 6-bis-(ethylamino)-s-triazine. The solubility of Simazine in water is very low, viz., 5 ppm. According to BISHOP (1962) and others, all amino-triazines have the same effect on photosynthesis. Therefore, Simetone has been taken for our investigations: 2-methoxy-4, 6-bis-(ethylamino)-s-triazine. The solubility of Simetone in water is better, viz., 3200 ppm at 20°C.
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