Vol. 2, Issue 2, Part A (2025)

Humic acid (HA), a key component of soil organic matter, has garnered significant attention in agriculture for its potential to enhance plant growth and productivity. This natural bio stimulant is derived from the decomposition of organic matter and has been shown to improve soil fertility, stimulate plant growth, and increase crop yields. In citrus farming, HA has been recognized for its ability to enhance vegetative growth, fruit yield, and resistance to environmental stressors. This paper explores the phytopharmacological effects of humic acid on citrus crops, focusing on its biochemical, physiological, and molecular impacts. The use of HA in citrus cultivation is beneficial due to its effects on nutrient uptake, water retention, root development, and resistance to diseases and pests. Additionally, HA contributes to improved fruit quality by enhancing photosynthetic efficiency and promoting the production of secondary metabolites that are essential for plant defense mechanisms. However, the optimal application of HA varies depending on soil conditions, climatic factors, and citrus variety. Despite these challenges, the application of HA offers a sustainable alternative to synthetic fertilizers, aligning with eco-friendly agricultural practices. This paper evaluates existing research on the role of HA in citrus farming, synthesizes findings from various studies, and discusses future directions for optimizing HA application. Through a comprehensive phytopharmacological evaluation, the paper aims to contribute to the understanding of HA's potential as a growth enhancer in citrus crops.