<![CDATA[Abstract. Depi K, Widowati, Umaiyah EI. 2026. Sorghum responses to a rice husk biochar-humic acid package under uniform terminal irrigation withdrawal. Asian J Agric 10 (2): g100240. https://doi.org/10.13057/asianjagric/g100240. This study evaluated the responses of three Bioguma sorghum varieties to a rice husk biochar-humic acid package under a single terminal irrigation-withdrawal regime. A 3 × 2 factorial completely randomized design comprised 24 experimental units, with four replicates per treatment combination and six grouped polybags per replicate (144 plants in total). Plant height, leaf number, stem diameter, biomass, and panicle and grain components were measured on all plants, whereas stomatal traits, chlorophyll, leaf water content, and Brix were analyzed as one composite value per replicate. Treatment A₁ received 500 g rice husk biochar, 0.25 g solid humic-acid product, and 2 mL liquid humic-acid product per polybag; A₀ received no amendment but underwent identical carrier-water and handling procedures. Irrigation was applied every four days until 9 February 2026 and then withheld until harvest on 14 April 2026. Repeated-measures analysis revealed pronounced temporal effects on plant height, leaf number, and stem diameter, whereas the time × amendment interaction remained significant after within-family FDR adjustment only for plant height. The main effect of amendment also remained significant after FDR adjustment for plant height and leaf number. Postharvest soil organic C was descriptively higher under A₁ (1.74%) than under A₀ (1.50%); however, the amendment effect did not remain significant at q<0.05 within the soil-chemistry family. After multiplicity adjustment, significant amendment effects persisted for stem dry weight and panicle length, while significant variety × amendment interactions persisted for water-holding capacity, bulk density, and total porosity; the interactions for particle density and pH remained nominal only. Because the experiment lacked a well-watered control and multiple water levels, no conclusions can be drawn regarding drought mitigation or tolerance.]]>
