Chemical control of carrot grass (Parthenium hysterophorus) and associated weeds in soybean (Glycine max)

Chemical control of carrot grass (Parthenium hysterophorus) and associated weeds in soybean (Glycine max)

1996

A:PS

Six herbicides (metolachlor @ 2.0 kg/ha, oxadiazon @ 1.0 kg/ha, alachlor @ 1.0 kg/ha, pendimethalin @ 1.0 kg/ha, oxyfluorfen @ 0.15 kg/ha and bentazon[e] @ 1.5 kg/ha) were tested to study their effectiveness for the control of carrot grass [Parthenium hysterophorus) and associated weeds in soyabeans (Glycine max). Bentazon @ 1.5 kg/ha applied at 25 days after sowing effectively controlled carrot grass, dayflower (Commelina benghalensis) and yellow nut sedge (Cyperus iria). The highest grain yield and net returns were obtained in the weed-free treatment, followed by bentazon @ 1.5 kg/ha. The presence of weeds caused a 50.2% reduction in the grain yield of soyabeans compared with the weed-free control. Grain yield was negatively correlated with weed dry matter (with an increase of 1 g weed dry matter/m2, grain yield was reduced by 1.445 ñ 0.368 kg/ha).

v.66(9):518-521, INDIAN JOURNAL OF AGRICULTURAL SCIENCES

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