OICC Press Journal of Crop Nutrition Science 2538-2470 10 1 2024 03 20 Influence of Humic Acid on Growth and Yield of Mung Bean (Vigna radiata L.) under Different Irrigation Regimens 1 14 10.71874/jcns.2024.16561 EN Fatemeh Lovimi Jahad Agri Expert Journal Article 2024 03 20 BACKGROUND: Drought stress is one of the most important factors limiting the production of agricultural products. The use of natural fertilizers can lead to optimal water consumption in agriculture. OBJECTIVES: In order to examine the impact of humic acid on yield of mung beans under different irrigation regimens, a study was conducted during the agricultural year 2014-15 in Ahvaz, south west of Iran. METHODS: Current study was done by split-plot design according randomized complete blocks design (RCBD) with three replications. The investigated treatments included irrigation intervals at three levels (60, 100, and 140 mm evaporation from Class A pan) as the main factor and various concentrations of humic acid at three levels (0, 0.5, and 1 g.lit-1) as the secondary factor. RESULT: Results revealed that both irrigation and humic acid significantly affected seed yield, yield components and chlorophyll index. The highest seed yield, averaging 212 gr.m-², was achieved with the 100 mm irrigation treatment, while the lowest, averaging 102 gr.m-², was observed with the 140 mm irrigation treatment. Concerning the influence of humic acid, the treatment with 1 g.lit-1 foliar application yielded the highest seed output (194 g.m-²). The interaction between irrigation and humic acid had a noteworthy impact solely on seed yield and 100-seed weight. The most favorable seed yield and 100-seed weight were recorded in the treatment with 100 mm irrigation and 1 g.lit-1 foliar application of humic acid, while the least favorable results were associated with the 140 mm irrigation treatment without humic acid foliar application, resulting in a 29% decrease in yield compared to the treatment with 100 mm irrigation and 1 g.lit-1 foliar application of humic acid. These findings underscore the significant role of humic acid in enhancing mung bean seed yield compared to scenarios without humic acid application. CONCLUSION: In summary, the use of humic acid not only boosts Mung bean yield but also holds the potential to contribute significantly to sustainable agricultural objectives. Furthermore, its application can lead to a reduction in the reliance on chemical fertilizers, thereby mitigating environmental pollution, and the associated lower consumption contributes to cost-effectiveness.