POTASH AND HUMIC ACID INTERACTIONS REGULATING GROWTH, YIELD AND NUTRIENT UPTAKE OF OKRA

Abstract

Okra is a nutritionally rich and economically important summer vegetable, yet its yield potential is often limited by nutrient deficiencies in semi-arid soils. A field experiment was conducted on Bari Chakwal soils to assess the effects of humic acid and potassium fertilization on growth, yield performance, and nutrient uptake in okra. The study employed a randomized complete block design with factorial arrangements and three replications. Growth traits, physiological indicators, yield components, nutrient uptake (N, P, K), and post-harvest soil fertility were evaluated. Application of humic acid significantly enhanced soil quality, nutrient availability, and plant physiological responses, while potassium supplementation improved pod traits and yield. The combined application of humic acid and potassium produced the highest improvements across growth, yield, and nutrient uptake parameters. Post-harvest soil analysis further confirmed residual improvements in fertility. The results demonstrate that integrating humic acid with optimal potassium fertilization is an effective and sustainable strategy to boost okra productivity and maintain soil health under semi-arid conditions.