Ứng dụng kỹ thuật ủ nóng tĩnh trong sản xuất phân hữu cơ từ thân bắp và phân bò tại Đồng Tháp

Abstract

This study assessed the effectiveness of aerated static pile composting using PVC pipe ventilation and a microbial inoculant to decompose fresh maize stalks and dried cattle manure in Dong Thap, Vietnam. Six compost piles were constructed using alternating 25-cm layers of fresh maize stalks and 5-cm layers of dried cattle manure and monitored until full maturity.  The internal temperature peaked at 72.1°C on day 3 at a depth of 90 cm, generally declined during the 15-60-day period, and approached ambient temperature by day 72. Sensory assessment using the hand-squeeze test indicated an estimated moisture level of approximately 60-65% on day 6, followed by generally stable moisture conditions of approximately 50-60% during much of the composting period. After 72 days, the composted material exhibited a dark brown color, an earthy odor, and a friable texture, showing sensory characteristics consistent with a well-decomposed state. This passive aeration system required no mechanical turning and showed practical potential for smallholder conditions. The findings provide a basis for further evaluation and potential application of this composting approach under similar farming conditions in the Mekong Delta.