Humus is the stable form of added crop and animal residues. The organic matter after a long-term decomposition process converts into humic substances. The naturally occurring humus is present in less amount in soils of the arid and semi-arid regions. The addition of commercially available humic acid can, therefore, contribute to improving soil health and crop yields. The present study was conducted to evaluate the effect of potassium humate, applied through soil seed dressing, on cotton productivity and fiber quality attributes. Seed dressing with potassium humate was done at the rate of 0, 100, 150 and 200 mL kg-1 seed while in soil potassium humate was applied at the rate of 0, 10, 20 and 30 L ha-1. Results showed that the combined application of potassium humate by seed dressing and through soil application improved the soil properties, productivity and fiber quality traits of cotton. All levels of soil applied potassium humate (10, 20 and 30 L ha-1) performed better over seed dressing in terms of cotton productivity and fiber quality attributes. Among the soil application rates, 20 L ha-1 potassium humate proved better as compared to other rates (0, 10 and 30 L ha-1). Higher soil application of potassium humate (30 L ha-1) showed depressing effects on all the traits studied like the reduction of 12.4% and 6.6% in Ginning out turn and fiber length, respectively, at a seeding dressing of 200 mL kg-1. In conclusion, potassium humate seed dressing and soil application at the rate of 200 mL kg-1 and 20 L ha-1, respectively, is a better approach to improve cotton productivity. Soil potassium humate should not exceed a rate of 20 L ha-1 when the seed dressing of potassium is also practiced.

Central Cotton Research Institute Multan 60000 Pakistan

Department of Agronomy Muhammad Nawaz Sharif University of Agriculture Multan 60000 Pakistan

Department of Agronomy The University of Haripur Haripur 22620 Pakistan

Department of Botany and Microbiology College of Science King Saud University Riyadh 11451 Saudi Arabia

Department of Geology and pedology Faculty of forestry and wood technology Mendel University in Brno Zemedelska 1 61300 Brno Czech Republic

Department of Soil and Environmental Sciences Muhammad Nawaz Sharif University of Agriculture Multan 60000 Pakistan

Department of Soil Science Faculty of Agricultural Sciences and Technology Bahauddin Zakariya University Multan 60800 Pakistan

Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource College of Tropical Crops Hainan University Haikou 570228 China

Institute of Crop Science and Resource Conservation University Bonn 53115 Bonn Germany

Plant Nutrition Section Mango Research Institute Multan 60000 Pakistan

Soil and Water Testing Laboratory for Research Chiniot Department of Agriculture Faisalabad 38000 Pakistan

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