Revista Brasileira De Herbicidas 2000; 1(1): 67-72
Herbicide retention by mulching in soybean, under no-tillage system
DOI: 10.7824/rbh.v1i1.318
The objective of this trial was to study the mulch retention of the herbicide mixtures imazaquin + pendimethalin and sulfentrazone + metribuzin applied in pre-emergence for soybean under no-tillage system. The experiment was settled in Londrina-PR, Brazil, with black oat (Avena strigosa) mulch. A randomized complete block design was used. The treatrnents comprised the following rates of herbicides: zero, 0.5 N, 1.0 N, 1.5 N and 2.0 N (N=normal rate of the herbicide). ln the present study, N=150 g/ha imazaquin + 1200 g/ha pendimethalin and 350 g/ha sulfentrazone + 360 g/ha metribuzin. After twenty four hours ofherbicide applications, 48.3 mm ofwater was applied in the experiments. ln the next day, samples ofsoil and straw were taken for chromatographic analysis purposes. The results showed that 100% of imazaquin and sulfentrazone leached from the straw to the soil. Approximately 50% of metribuzin and 100% of pendimethalin were retained by the oat straw.
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