Growth Behavior, Nodulation and Rhizobium Population, as Affected by Combined Application of Herbicide and Insecticide In Soybean (Glycine max L.)

A field experiment was conducted at Research Farm of IGKV, Raipur during Kharif 2013 to evaluate the combined effect of herbicide and insecticide on growth, nodulation and Rhizobium population in soybean. All the herbicidal treatments recorded significantly at par to improving growth characters viz. LAI, CGR and RGR. Highest Nodule number (74.2 plant(-1)) and nodule dry weight (74.2 mg plant(-1)) was resulted by Quizalophop ethyl 5 EC @ 1.0 1 ha(-1) as sole or combination with insecticides. Whereas all the pesticidal treatments found negative impact on microbial count which was recorded superior (62.1 x10(6) g(-1) soil) under Untreated Check. The highest seed yield (2323 kg ha(-1)), stover yield (2943 kg hat), net income (63655 (1) /ha) and B:C ratio (3.09) was recorded under Imazathapyr 10 SL@1.0 1 ha(-1).