Abstract

Experiments were carried out to study the integrated methods of weed management using acetochlor the new low rate herbicide, incorporation of biomass of weed Lantana camara L. and azolla with two different land preparation methods in 'rice-rice-greengram' cropping system. Land preparation methods of paraquat at 1.0 kg ha-1+ tractor ploughing with cage wheel by one pass and tractor ploughing with cage wheel by two passes are comparable in weed control. Acetochior 50 g ha-1 was selective and efficient in checking the weeds than the higher dose (75 g ha-1) in both the rice crops. Acetochlor application of 8 DAT+ HW controlled the weeds efficiently than applied at transplanting. Among the non-chemical weed management methods, lantana incorporation + HW showed effective weed control (especially the sedges) due to the release of allelo chemicals and addition of nitrogen through lantana. incorporation also complemented for the increased grain and straw yield, resulting in higher net income. The lantana biomass incorporation is ecologically safe, because it is not causing any residue problem.

Keywords: Acetochlor, Butachlor, Paraquat, Lantana camara L.. rice, cropping system, integrated weed management