Bio-efficacy of flumioxazine for weed management in soybean and itsresidual effect on succeeding crops

摘要

Soybean [Glycine max (L.) Merrill] is the third largest oilseed crop of India after rapeseed and mustard. It has been observed that soybean yields can be reduced if weeds are not controlled (Vollmann et al. 2011 and Mohammadi and Amiri 2011). The reduction in soybean yield due to weed infestation varied from 20-77% depending on the type of soil, season and intensity of weed infestation (Kuruchania et al. 2000). Thus, efficient weed management is an essential pre-requisite for increasing the crop productivity. Several new herbicides have been evaluated for their weed control efficacy in soybean. Although, the research has provided a few options involving pre-plant incorporation (trifluralin and fluchloralin), pre-emergence (alachlor, pendimethalin, inetolachlor and clomazone) and post-emergence (imazethapyr, quizalofop-ethyl and chlorimuron-ethyl), there is a need to identify newer herbicides for selective management of weeds and to overcome the problem of acquiring resistance by certain weeds against recommended herbicides. Flumioxazine (N-phenylphthalimide) is a new contact herbicide which acts on weeds by inhibiting protoporphyrinogen oxidase, an enzyme important in the synthesis of chlorophyll. In this study, an attempt was made to find the effectiveness of flumioxazine to control broad-leaved weeds and some grassy weeds in soybean and its residual effect on succeeding crops.