Aloe vera (Aloe vera L.), also known as yellow patience, is a valuable medicinal and ornamental plant widely cultivated in many countries, including Iran. In addition to its use in the pharmaceutical, food, cosmetic, and health industries, it can be grown as a potted plant and in outdoor landscapes. With the increasing cultivation and consumption of Aloe vera worldwide, and considering the environmental impact of chemical inputs, the use of organic resources to meet its nutritional needs has become a priority. Seaweed extract (SWE) and humic acid, effective bio-stimulants in the agricultural inputs market, can enhance plant and soil performance. The main objective of this experiment was to investigate the effect of foliar applications of SWE and humic acid on the growth, yield, and biochemical traits of Aloe vera. The research was conducted under greenhouse conditions using a factorial (3×3) scheme based on a randomized complete block design with three replications. The first factor was SWE treatment at three levels (0, 5, and 10 ml L-1), and the second factor was humic acid treatment at three levels (0, 100, and 200 mg L-1). At the end of the experiment, various plant characteristics were eva‎luated, including the number of leaves, leaf length, leaf width, leaf thickness, pup numbers, fresh and dry weight, gel content, chlorophyll a and b, carotenoids, carbohydrate content, and phenol and flavonoid contents. The results showed that the maximum gel content was observed at 5 ml L-1 of seaweed extract, and the maximum pupnumbers were seen in June at 100 mg L-1 of humic acid. Seaweed extract positively affected the levels of chlorophyll a, chlorophyll b, total chlorophyll, carotenoids, total carbohydrates, total phenols, and flavonoids. Humic acid also positively influenced the total carbohydrate content of Aloe vera leaves. Based on these results and PCA analysis, applying 5 ml L-1 seaweed extract alone and 10 ml L-1 seaweed extract combined with 100 and 200 mg L-1 humic acid effectively increased the morphological and physiological characteristics of Aloe vera. Keywords: Seaweed extract, Humic acid, Aloe vera plant, Percentage gel, Phenol compounds, Flavonoid content

نعمت اله اعتمادي شلمزاري , علي نيك بخت

مهديه غلامي , حميدرضا عشقي زاده