Studies on Rates and Times of Isoproturon Application in Flax

Field experiments conducted at the Research Farm of Department of Agronomy, Himachal Pradesh Krishi Vishvavidyalaya,.Palampur during rabi seasons of 1990–91 to 1992–93 revealed that post-emergence application (35 DAS) of isoproturon at different rates (1.0, 1.25 and 1.50 kg/ha) was found effective in reducing weed density and biomass significantly as compared to pre-emergence application at above said rates. Post-emergence application of isoproturon at 1.0 and 1.25 kg/ha remaining at par produced significantly higher plant height, grain, stalk and fibre yield of flax as compared to pre-emergence application at different rates. However, post-emergence application of isoproturon at 1.50 kg/ha combination of isoproturon+2, 4-D (1.0+ 1.0 kg/ha) were found to have phytotoxic effect on flax plants.