Evaluation of some new herbicides formulations alone and in combination with hand weeding in lowland rice

A field investigation was conducted during Samba season of 2017 to evaluate the efficacy of pre and post emergence herbicides in transplanted rice in Cuddalore. The new herbicides evaluated were Pretilachlor 6% + Pyrazosulfuron-ethyl 0.15% GR @ 10 kg ha-1 along with post emergence herbicides Fenoxaprop-p-ethyl 9.3% w/w @ 875 ml ha-1, Bispyribac-sodium 10% SC @ 200 ml ha-1. Results of the study revealed that Pre-emergence herbicide application of Pretilachlor + Pyrazosulfuron-ethyl followed by post emergence herbicide application of Bispyribac-sodium recorded lower weed total population, higher growth parameters, grain yield (5163 kg ha-1) and straw yield (7654 kg ha-1) followed by Pretilachlor + Pyrazosulfuron-ethyl + Fenoxaprop-p-ethyl.