Adding organic amendments to paddies to improve water use efficiency (WUE) could be a potential strategy to improve soil water storage. This research looked at the effects of biochar and compost additions at 20 t ha⁻¹ rates in a rice field for two years, using three irrigation regimes called I₁₀₀, I₇₅, and I₅₀ which indicate irrigation rates of 100%, 75%, and 50% of evaporation from class A evaporation pan. Changes in soil matric potential curves, as well as rice yield components such as height, grain yield, panicle density, and spikelets per panicle, as well as well water consumption, were measured. Adding biochar to all irrigation regimes resulted in the greatest increase in matric potential points. Biochar enhanced water holding capacity under higher evaporation stress than compost. Biochar treatment under the I₅₀ regime increased grain yield by 35% and 30% in two consecutive years. While in compost-treated soil and I₅₀ regime, the amount of grain yield significantly decreased by 7% and 38% compared to control, respectively, in 2020 and 2021. Using biochar significantly increased WUE in order to decrease irrigation regimes. The two years did not significantly differ from one another. However, using compost, WUE showed a declining trend in response to lower irrigation regimes. When evaporation is excessive and irrigation is insufficient, biochar's higher porosity and surface area, as well as its greater stability to decomposition relative to compost, may improve WUE in rice.

在稻田中添加有机改良剂以提高水分利用效率 (WUE) 可能是改善土壤蓄水的潜在策略。本研究使用称为 I ₁₀₀、I ₇₅和 I ₅₀的三种灌溉方式，研究了两年内以 20 t ha ^{-1的速率在稻田中添加生物炭和堆肥的效果}这表明从 A 级蒸发盘蒸发的灌溉率分别为 100%、75% 和 50%。测量了土壤基质势曲线的变化，以及水稻产量成分，如高度、粮食产量、穗密度和每穗的小穗，以及水的消耗量。将 biochar 添加到所有灌溉方案中导致基质势点的最大增加。与堆肥相比，生物炭在更高的蒸发压力下增强了持水能力。I ₅₀制度下的生物炭处理连续两年增加了 35% 和 30% 的粮食产量。在堆肥处理的土壤中和 I ₅₀与对照相比，2020 年和 2021 年粮食产量分别显着下降了 7% 和 38%。使用生物炭显着增加了 WUE 以减少灌溉制度。这两年彼此之间没有显着差异。然而，使用堆肥，WUE 显示出下降的趋势，以应对较低的灌溉制度。当蒸发过度和灌溉不足时，生物炭较高的孔隙率和表面积，以及相对于堆肥的分解稳定性更高，可能会改善水稻的 WUE。