The behaviours of asulam in turf. 2. Selectivities and behaviours in turf grasses.:(2) Selectivities and Behaviours in Turf Grasses
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The selectivities and the behaviours of asulam [methyl N- (4-amino phenylsulfonyl) carbamate] in turf grass was studied, and the following results were obtained.<BR>1. The effect of asunlam on manilagrass (<I>Zoysia matrella</I>) and bermudagrass (<I>Cynodon dactylon</I>)<BR>(a) . The effect on the turf grass by foliar treatment<BR>Asulam was applied on turf grass by foliar treatment and after the treatment, the weight of aboveground parts of turf grass was determined.<BR>On account of the damage caused by asulam, the weight in manilagrass decreased a little at 20 days but the grass recovered from the phtotoxicity at 60 days after treatment.<BR>Bermudagrass suffered from great damage at 20 days after the treatment and the weight of bermudagrass decreased greatly, and even at 60 days after the treatment, the injury did not recover.<BR>(b) . The effect on manilagrass by root treatment in soil<BR>Asulam was applied on manilagrass by root treatment, and the weight of aboveground part of manilagrass was determined after the treatment.<BR>The weight of manilagrass decreased by 40-50% at 20 days after the treatment of asulam at 300-750g/10a, but no growth inhibitory effect was found at 60 days after the treatment.<BR>(c) . The effect on manilagrass by foliar treatment in different seasons.<BR>There were a little adverse effects on manilagrass when asulam was applied in May, June and October. There were moderate damages to the turf grass when asulam was applied in August and February.<BR>(d) . The effect of asulam in the mixture with other herbicides.<BR>No adverse effect on the manilagrass was obserbed except for combined use of asulam with hormone-type herbicides or with emulsifiable concentrate-formulated herbicides. The adverse effect caused by the application of above mentioned combinations was not so great and the grass soon recovered from the damage.<BR>2. The residue of asulam in manilagrass and bermudagrass<BR>Asulam was applied by foliar treatment at 5000 ppm, and the residue in the turf grass was determined by HPLC.<BR>The residual concentration of asulam in manilagrass decreased gradually. The residue was 21 ppm at 6 days, 10 ppm at 10 days and 6.3 ppm at 16 days after the treatment. On the other hand, the residual concentration in bermudagrass did not show remarkable decrease. The residue was 9.9 ppm at 6 days and 8.8 ppm at 16 days after the treatment.
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