Phyla nodiflora faces a retarded growth during the first growing season; therefore, this study was focused on the evaluation of the effect of humic acid on the growth and establishment of P. nodiflora. Herein, the first experiment was performed to assay the effect of four levels of humic acid, including 0, 250, 500, and 750 mg L⁻¹, on the rooting properties of P. nodiflora in the sand medium. The second and third experiments were performed to evaluate the influence of humic acid on the morpho-physiological characteristics in the greenhouse and field environments with two humic acid foliar and fertigation applications, in two consecutive years. The physiological traits including chlorophyll, carotenoids, carbohydrates, protein, and anthocyanin content along with the morphological traits including underground organs (root length and volume, root wet and dry weight) and aerial organs (wet and dry weight) were significantly enhanced by humic acid in both application methods at the three experiments when compared to the control. Fertigation with humic acid of 500 mg L⁻¹ in the field and greenhouse conditions was the most effective treatment on the traits measured. Fertigation with humic acid of 500 mg L⁻¹ can be used to accelerate the growth rate of P. nodiflora during the first growing season.

Phyla nodiflora在第一个生长季节面临生长迟缓；因此，本研究的重点是评估腐植酸对紫菜生长和建立的影响。在此，进行第一个实验以测定四种水平的腐殖酸，包括0、250、500和 750 mg L ^-1对P. nodiflora生根特性的影响在砂介质中。连续两年进行了第二和第三次实验，以评估腐植酸对温室和田间环境中腐植酸叶面和灌溉施肥两次施用的形态生理特征的影响。腐植酸显着增强了叶绿素、类胡萝卜素、碳水化合物、蛋白质和花青素含量等生理性状以及地下器官（根长和体积、根干湿重）和地上器官（湿重和干重）等形态特征。与对照相比，在三个实验中的两种应用方法中。用 500 mg L ^-1腐植酸施肥在田间和温室条件下是对测量的性状最有效的处理。在第一个生长季节用500 mg L ^{-1 的}腐殖酸进行灌溉施肥可加快P. nodiflora的生长速度。