Abstract

                                In the experiment conducted during 1977 and 1978 at Agronomy tre'd, Main Research Station, University of Agricultural Sciences, Bangalore, the herbicides treat- ments were pre-emergence application of 2, 4-D at 0.5 kg a i/ha, neburon at 0.5 and 1,0 kg a. i/ha, nitrofen at 0.5 kg a. ifha and post-emergence application of 2. 4-D at 3.5 kg a i/ha, neburon at 0.5 and 1.0 kg ai/ha. propanil at 1 kg ai/ha. along with weed free thand weeding at 20. 35 and 53 days after transp'anting) and an unweeded control. Weed free treatment gave the highest grain yield (3807 kg/ha in 1977 and 3263 kg/ha in 1978). Among the herbicidus. pre-emergence application of neburon at 1kg ai/ha gave the highest grain of 3300 kg/ha in 1977 and 2800 g/ha in 1978 and it was on par with post-emergence application of 2, 4-D at 05 kg ai/ha, and pre-emergence application of neburon at 0,5 kg alha. Similar trend was observed in case of straw yield also. In the year 1977, highest net profit was in weed free Rs. 1885/ha followed by post-emergence application of 2, 4-D at 0.5 kg ai/ha (Rs. 1474/ha), pre- emergence application of neburon 0.5 kg ai/ha (Rs. 1467/ha) and at 1.0 kg ai/ha Rs. 1467/ha). During 1978, the highest net profit was again in weed free treat- ment (Rs. 1448/ha), followed by pre-emergnece application of neburon 0.5 and 1.0 kg ailha, and post emergence application of 2. 4-D at 0.5 ka ailha.

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