Utilization of organic fertilizers and chemical fertilizers on asparagus (Asparagus officinalis Linn.) quality, yield and soil chemical properties

Study aims to investigate the effects of multi-mixed organic fertilizers on soil chemical properties and asparagus (Brock's Improved) yield and spear quality grown in Kamphaeng Saen soil series. These three fertilizers were the SMB formula, a mixed of biogas sludge (S), cattle manure (M), and oil palm empty fruit bunch (B), the SMC formula, a mixed of biogas sludge (S), cattle manure (M), and rice husk charcoal (C) and the PMP formula, a pig manure pellets. Field experiments were conducted using RCBD experimental design with 8 treatments, and 3 replications. Results showed that the application of mixed organic fertilizers increased soil OM, nitrate, and CEC. Applications of PMP also resulted in phosphate and copper accumulations in soil. Applying high amounts of SMB significantly enhanced the asparagus spear quality and yield. The control treatment resulted in the lowest quality of asparagus spear.