فهرست نشریات علمی دسترسی آزاد ایران

Okra (Abelmoschus esculentus) is an important vegetable crop valued for its nutritional and economic significance. Enhancing soil fertility through organic and mineral amendments such as humic acid and agricultural sulfur can play a key role in improving its growth and productivity. A factorial experiment was conducted at the nursery of the College of Education for Pure Sciences, University of Diyala, from March 1, 2025, to April 30, 2025, to evaluate the effects of soil fertilization with humic acid and agricultural sulfur on some growth characteristics of okra plants. The treatments consisted of a control (no fertilization), humic acid at two concentrations (5 and 10 g L⁻¹), and agricultural sulfur at two concentrations (5 and 10 g L⁻¹), arranged in a completely randomized design (CRD) with three replications. Black plastic pots (20 cm diameter, 20 cm height) were used, each containing 5 kg of soil. The fertilizers were added to the soil after germination and seedling emergence, and plant responses were observed daily throughout the study period, which lasted 59–61 days. The results showed that humic acid fertilization at 10 g L⁻¹ produced the highest significant increases in plant height (159.6 cm), fresh weight (78.0 g), and dry weight (54.0 g). The highest chlorophyll content (74.3 SPAD units) was recorded with agricultural sulfur fertilization at 10 g L⁻¹. Agricultural sulfur fertilization also resulted in significant improvements in other traits, although the magnitude of these increases was generally lower than those observed with humic acid fertilization.