EFFECT OF DIFFERENT HERBICIDES USED IN TRANSPLANTED RICE ON WEED MANAGEMENT IN RICE-LATHYRUS CROPPING SYSTEM

Abstract

A field experiment was carried out to study the effect of different herbicides used in transplanted rice on weed management in rice-lathyrus cropping system at Central Research Farm (New Alluvial Zone), Gayeshpur, Nadia, West Bengal (23ºN latitude, 89ºE longitude). The experimental results revealed that Imazosulfuron 10% SC @ 100 g a.i. ha^-1 applied at 5 days after transplanting (DAT) effectively controlled most of the rice weeds, exhibiting no phytotoxicity symptoms to the rice crop and increased both grain and straw yields (4.55 and 5.68 t ha^-1 resprctively) vis-a-vis benefit : cost ratio (1.35). This treatment shows no statistical divergence with hand weeding twice. Similar trend of observations were documented in the succeeding crop of the sequence lathyrus. So, the findings of the experiment provide us with a great opportunity of using new herbicides with very low doses to cope up with the labour crisis and minimize the cost of cultivation, therefore, maximizing benefit cost ratio.