Performance of promising herbicides on weed population and grain yield of rainfed wheat (Triticum aestivum).

摘要

A field experiment was conducted in Pantnagar, Uttar Pradesh, India, during the 2001/02 cropping season, to study the performance of different herbicides (fluchloralin, isoproturon, metribuzin and pendimethalin) on Anagallis arvensis, Erigeron canadensis [Conyza canadensis] and Phalaris minor populations and grain yield of wheat cv. UP 2425. The treatment comprised: weedy (T1); weed-free (T2); hand weeding at 20 and 45 days after sowing (DAS; T3); 0.5 kg fluchloralin (T4); 1.0 kg fluchloralin (T5); 1.0 kg isoproturon (PE; T6); 1.0 kg isoproturon at 30 DAS (T7); 100 g metribuzin (PE; T8); 200 g metribuzin (PE; T9); 0.75 kg pendimethalin (PE; T10); 1.50 kg pendimethalin (PE; T11); and 0.5 kg 2,4-D/ha at 35 DAS (T12). P. minor was significantly controlled by all herbicides except 2,4-D. A. arvensis was not controlled in T6 but was controlled in T7. Weed populations were significantly reduced in T4, T5, T7, T9, T10 and T11 treatments. Weed dry matter was higher in the weedy control (157 g/m2) compared to all the herbicide treatments except in T12 and T8. Higher plant height (67.10 cm) was recorded in T2 followed by T3 but was lower in T4 and T5. The highest grain yield (26.18q/ha) was recorded in T2 and lowest in T1 (21.72 q/ha)..