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Abstract (in English)
Rice is one of the most significant crops in the world, and in Afghanistan. Recently, due to increases in the application of chemical fertilizers, many environmental problems have occurred in rice fields. Humic acid originates from natural, organic sources and can increase crop yield. The effects of Humic Acid on the yield of rice have not been studied in previous research and need to be investigated further. Thus, the current research was conducted in the Kohkaran research farm, Kandahar. Randomized Complete Block Design (RCBD) with four treatments, including T0 (control), T1 (500 kg HA ha-1), T2 (1000 kg HA ha-1), and T3 (1500 kg HA ha-1) replicated three times. Results demonstrated that yield parameters of rice, such as No of panicle, filled grain fer panicle, 1000 grain weight, and yield increased significantly by 24.73%, 27.06%, 26.15%, and 34.80% compared to control suing 1500 kg/ha Humic acid. Moreover, according to the results between the two rice varieties in the research Bara variety demonstrated higher yield compared to the Surkha-e-Zraati variety by application of Humic Acid.