Evaluation of Allelopathic Potential of Oxalis europea on Weed and Rice Growth

During the aman season (June–November) of 2019, an experiment was carried out at the Agronomy Field Laboratory of Bangladesh Agricultural University, Bangladesh, to examine the allelopathic potential of amrul shak (Oxalis europea) residues on weed management and crop performance of T. aman rice. Three cultivars, Binadhan-7, BR11, and BRRI dhan49, were used in the trial, together with five various amrul shak residues: no crop residues, 0.5 t ha-1, 1.0 t ha-1, 1.5 t ha-1, and 1.5 t ha-1 + farmers' practice (one hand weeding). The relationships between variety, amrul shak residues, and weed population, dry weight, and percent inhibitions were shown to be highly significant. For every weed species, the treatment with no agricultural residues had the largest weed population and dry weight (T1). Amrul Shak residues 1.5 t ha-1 + Farmers' practice (one-hand weeding) had the lowest dry weight and weed population of all the weed species (T5). The application of amrul shak residues @ 1.5 t ha-1 + Farmers' practice (one hand weeding) resulted in the highest percent inhibition of 78.63, 81.42, 77.87, and 78.75 in Shama (Echinochloa crusgalli), Panikachu (Monochoria vaginalis), Chesra (Scirpus juncoides), and Susni shak (Marsilea quadrifolia), respectively. The study's findings suggest that the residues of amrul shak have the ability to inhibit the growth of weeds. For the purpose of producing T. aman rice, amrul shak residues therefore present a promising supply of effective weed control tools.