1Department of Agronomy, Faculty of Agricultural Sciences, Siksha ‘O’ Anusandhan (Deemed to be University)Bhubaneswar, Odisha-751029, India
2ICAR-National Rice Research Institute, Cuttack, Odisha-753006, India
*Corresponding author e-mail: ritonchowdhury@soa.ac.in
Online Published on 25 March, 2022.
Results of field experiments conducted in farmer's fields to find out suitable and effective weed control methods for the rice-mustard and sesame crop sequence during 2015–16 and 2016–17 are reported. There were 11 treatments for each crop laid out in RBD in three replications. The predominant weed flora observed during the experimental periods were Echinochloa colona, Digitaria sanguinalis and Ludwigia parviflora in direct seeded rice (DSR); D. Sanguinalis and Chenopodium album in mustard and E. colona, and Trianthema portulacastrum in sesame. Weed density and biomass were the least in the weed free (T10) for all the crops with the highest values of weed control efficiency while treatment T8 (bispyribacs sodium 0.025 kg ha−1 + 1 HW (hand weedind) for rice and oxadiazon 0.5 kg ha−1 + 1 HW for rapessed and sesame) closely followed. Yield attributes and yield of the three crops in sequence were the highest in the treatment T10 with T8 following. Evaluating the economics due to costly human labour, treatment T8 outplayed weed free treatment with higher values of B:C ratio of 1.31, 1.40 for rice; 1.43 and 1.47 for mustard and 2.22 and 2.46 for sesame respectively during the two respective years. Treatment T8 for the respective crops has a yield increment of 44.4 and 38.8 per cent in DSR, 44.3 per cent and 42.4 in mustard and 54.1 and 53.8 per cent in sesame respectively over the weedy plots. Application of recommended herbicide with one HW is suggested for managing complex weed flora and obtaining higher yield in a profitable manner in the DSR-mustard-sesame cropping system.
Insecticides, Hand weeding, Weed management, DSR, Mustard, Sesame
