The syersisms in the comdinations of pendimethalin and triazine herbicides

Abstract

1. Pendimethalin [N- (1-ethylpropyl) -2, 6-dinitro-3, 4-xylidine] was very effective for gramineous weed control, but not so good for broad-leaved weed control in pre-emergence treatment.
2. The combinations of pendimethalin and triazine herbicides were very effective for controling many gramineous and broad-leaved weeds and they also controled the considerably developed weeds.
Pendimethalin plus simazine [2-chloro-4, 6-bis (ethylamino) -1, 3, 5-triazine] (150g a, i. + 60g a.i. / 10a) controled the weeds at 0-1.5 leaf stage and pendimethalin plus atrazine [2-chloro-4-ethylami-no-6-isopropylamino-1, 3, 5-triazine] (150g a, i. + 60g a, i. /10a) controled weeds at 0-2.5 leaf stage.
3. The soil treatment layer of pendimethalin was not increased by adding simazine but the layer of pendimethalin was considerably increased by adding atrazine.
4. The phytotoxicities of the combination of pendimethalin and simazine to Japanese lawn grass and Manilla grass were a lithe. But the combination of pendimethalin and atrazine to these lawn grasses were somewhat toxic, especially autumn application of the combination at high dosage was more toxic to Japanese lawn grass then to Manilla grass.