Carbon sequestration potential of napier (Pennisetum purpureum) grass applied with varying classifications of livestock excrement
Paper Details
Carbon sequestration potential of napier (Pennisetum purpureum) grass applied with varying classifications of livestock excrement
Abstract
This study evaluated the carbon sequestration potential of napier grass (Pennisetum purpureum) applied with varying classifications of livestock excrement under a combined inorganic–organic fertilization system. The experiment was conducted at the RDE Complex, College of Agriculture, Central Mindanao University from June to August 2025 using a Randomized Complete Block Design (RCBD) with five treatments: control (recommended rate of inorganic fertilizer), and combinations of inorganic fertilizer with goat manure, chicken manure, cattle manure, and swine manure. Results revealed highly significant differences (p< 0.01) among treatments in soil organic matter, soil pH, soil organic carbon (SOC), soil organic carbon stocks (SOCS), and carbon sequestration of napier grass. Among treatments, cattle manure (T4) consistently showed the highest performance, recording the greatest organic matter content (4.01%), favorable soil pH (6.03), highest SOC (2.33%), highest SOC stocks (32.15 Mg/ha), and highest carbon sequestration potential (4.72 Mg/ha). Swine manure (T5) produced the highest bulk density (1.29 g/cm³), while the control treatment showed the lowest carbon storage values across parameters. Overall, organic amendments significantly improved soil carbon dynamics compared to the control, demonstrating the strong potential of integrated nutrient management in enhancing carbon storage in napier grass systems. The findings indicate that cattle manure is the most effective amendment for maximizing soil carbon sequestration and improving soil quality, thereby contributing to climate change mitigation and sustainable forage production systems.
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