The study investigated the effects of different plant spacing treatments on the growth, yield components, and productivity of the modern rice variety BRRI dhan100 during the Boro seasons of 2022-23 and 2023-24. Six plant spacing treatments viz. T1=20cm x 15cm, T2=20cm x 20cm, T3=25cm x 15cm, T4=30cm x 15cm, T5=25cm x 25cm and T6=30cm x 30cm were designed with RCBD with three replications. Plant height, panicle length, thousand grain weight and spikelet sterility showed no significant variations among the treatments. However, tiller and panicle numbers varied significantly, with closer spacings (20cm × 15cm and 25cm × 15cm) producing the highest tillers and panicles hill-1 and m-2, leading to higher grain yield. Wider spacing (30cm × 30cm and 25cm × 25cm) resulted in increased tillers hill-1, exhibited superior individual plant biomass due to better resource availability but lower overall productivity. Grain yield was highest in 20cm × 15cm and 25cm × 15cm treatments, followed by 20cm × 20cm, due to enhanced tiller production, panicles, biomass efficiency thus increased grain yield. Closer spacing improved resource utilization and weed suppression, optimizing grain yield per unit area. The
spacing; tiller number; panicle number; grain yield; biological yield; harvest index
Biswas, Md.A., Karmakar, B., Tonmoy, SMMS., Tamanna, S., Roy, TK. (2026): Influence of Planting Geometry on the Yield Performance of the Modern Boro Rice Variety BRRI dhan100. Scientia Agriculturae Bohemica, 57, 1, DOI: 10.7160/sab.2026.570109