Invasive Species Compendium

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Abstract

Studies of new herbicides on weed growth and yield of soybean.

Abstract

This paper presents the results of a study conducted during the kharif season of 2016 to determine suitable weed management practices for growing soyabean under the agroclimatic condition of Chhattisgarh plain, India. The treatments comprised different weed management practices, i.e. T1-fomesafen 17.5% (w/w) ME+clodinafop 12.5% (w/w) ME at 750 g a.i./ha as post-emergence (PoE), T2-fomesafen 17.5% (w/w) ME+clodinafop 12.5% (w/w) ME at 1000 g a.i./ha as PoE, T3-fomesafen 17.5% (w/w) ME+clodinafop 12.5% (w/w) ME at 1250 g a.i./ha as PoE, T4-clodinafop 12.5% (w/w) ME at 1000 g a.i./ha as PoE, T5-fomesafen 17.5% (w/w) ME at 1000 g a.i./ha as PoE, T6-fomesafen 11.1% w/w+fluazifop-p-butyl 11.1% (w/w) SL at 1000 g a.i./ha as PoE, T7-imazethapyr at 300 g a.i./ha as PoE, T8-quizalofop ethyl+chlorimuron ethyl at 400+16 g a.i./ha as PoE, T9-hand weeding twice at 20 and 40 DAS and T10-weedy control. Total and species wise weed density and dry matter accumulation of Parthenium hysterophorus, Euphorbia geniculata [E. heterophylla], Celosia argentea, Echinochloa colonum, Cynodon dactylon, Cyperus rotundus, Convolvulus arvensis and Alternanthera spp. were observed throughout crop growth period. The minimum P. hysterophorus density was recorded under T9, followed by T3, T2 and T1. The minimum production of dry matter by P. hysterophorus, Euphorbia geniculata, Celosia argentea, Echinochloa colonum, Cynodon dactylon, Cyperus rotundus, Convolvulus arvensis and Alternanthera spp. and other weeds was recorded under T3, followed by T9 and T2. Different new herbicides application and T9 produced the maximum seed and stover yield, followed by T2, T3 and T8. However the data were at par in T1, T2, T3, T4 and T8.