Effect of isoproturon tank mix with metsulfuron and 2,4-D on weeds and yield of wheat (Triticum aestivum)

Abstract

An experiment was conducted during the winter season of 1998-99 and 1999-2000 at New Delhi, to find out the effect of isoproturon tank mix with metsulfuron and 2,4-D. A competition was recorded between wheat (Triti- cum aestivum L. emend. Fiori & Paol.) and canary grass (Phalaris minor Retz.), wild oat (Avena ludoviciana), blue pimpernel (Anagallis arvensis L.) and lambsquarters (Chenopodium album L.). Competition by these spe- cies lowered crop yield by 35%. lsoproturon and its tank mix with metsulfuron and 2,4-D gave excellent control of blue pimpernel (90 to 100%) and lambsquarters (82-97%), moderate control of canary grass (68-87%) but poor control of wild oat (1 6-36%). The highest increase in yield attributes and yield was under hand-weeding which was significantly superior to other treatments. The effect of tank mix of isoproturon (1,000 g/ha) and 2,4-D (500 g/ha) was consistent and it resulted in higher increase than that of tank mix of metsulfuron.