Asian Research Journal of Current Science

Soil degradation in loamy sand soils poses a significant challenge to agricultural productivity. This 120-day laboratory incubation study evaluated the effects of various organic materials such as cow dung, chicken manure, rice straw, maize straw, and their combinations on the physicochemical properties of loamy sand soil under a completely randomized design. Results showed that maize straw significantly improved soil physical properties by reducing bulk density and increasing porosity, likely due to its high lignin content and resistance to rapid decomposition. Chicken manure was most effective in enhancing chemical fertility, significantly increasing total nitrogen, available phosphorus, available potassium, and cation exchange capacity. All organic amendments increased soil organic carbon, with straw-based treatments showing the highest retention. However, a consistent decrease in soil pH was observed across all treatments, particularly with straw applications, indicating a potential for acidification. Strong correlations were found between organic carbon and improved water holding capacity, and between cation exchange capacity and nutrient availability. These findings suggest that while no single material improves all properties equally, maize straw is optimal for enhancing soil structure, whereas chicken manure is superior for nutrient enrichment. Strategic selection or combination of organic inputs can therefore support sustainable management of degraded sandy soils in Myanmar.