Abstract

Field experiments were carried during summer 2009 and 2010 at Agricultural Research Station, Kathalagere, district Davangere in the southern transitional zone of Karnataka to know the residual effect of triasulfuron and other weedicides against test crops. The soil of the experimental field was red loamy. The field experiment was laid out in randomized block design with 10 treatments viz., After harvest of rice crop, all the plots were sown with three rows each of test crops viz. greengram, blackgram and cowpea. Germination per cent of greengram, blackgram and cowpea did not differ significantly due to residual effect of weed control treatments. At 10 DAS, Pyrazosulfuron @ 25 g a.i. ha -1 recorded lower dry weight of greengram (0.026 and 0.040 g plant -1 during 2009 and 2010, respectively), blackgram (0.033 and 0.054 g plant -1 during 2009 and 2010, respectively) and cowpea (0.072 and 0.121g plant -1 during 2009 and 2010, respectively). Hand weeded twice recorded higher dry weight of these test crops. The pyrazosulfuron @ 25 g a.i. ha -1 recorded significantly lower seed yield of greengram (182 and 147 kg ha -1 during 2009 and 2010, respectively), blackgram (532 and 349 kg ha -1 during 2009 and 2010, respectively) and cowpea (1272 and 499 kg ha -1 during 2009 and 2010, respectively), followed by almix @ 4 g a.i. ha -1 .

Keywords: Triasulfuron, Test crops, Germination, Dry matter production, Seed yield