Hot Water Extract of Lentil Enhances Weed Control Efficiency and Yield of Boro Rice under Subtropical Condition

The agriculture sector is continuously adopting environmentally friendly and sustainable methods to reduce the harmful effects of herbicides on crop production. In this context, an experiment was conducted at the Agronomy Field Laboratory (AFL), Bangladesh Agricultural University (BAU), Mymensingh, from December ۲۰۲۱ to May ۲۰۲۲, to investigate the effect of combined hot water extracts of lentil on weed control efficiency and yield performance of boro (dry season irrigated) rice. The experiment involved four varieties of boro rice: BAU dhan۳, BRRI dhan۲۸, BRRI dhan۸۱, and BRRI dhan۹۶, and four treatments of crop residues. For most weed species, varieties and crop residue extracts significantly impacted weed population (WP) and weed dry weight (DW). The highest numbers of effective tillers (NET) hill-۱, numbers of spikelets panicle-۱ (NSP), ۱۰۰۰-grain weight (TGW), grain yield (GY), and straw yield (SY) were observed in the three-times hand weeding treatment. This was followed by the combination of hot water extract of lentil (EL) applied as a pre-emergence treatment three days after transplanting and post-emergence ten days after transplanting, with the lowest values found in the no-extract treatment. Considering interaction effects, the highest GY (۶.۸۰ t ha-۱) and SY (۸.۲۳ t ha-۱) were observed with hand weeding combined with the variety BAU dhan۳. The results of this study indicated that hand weeding, followed by the combined application EL crop residue, showed potential activity to suppress WP and significantly affected the yield of boro rice.

کلیدواژه ها:

Irrigated rice ، Weed population ، Weed dry weight ، Grain yield ، Harvest index