POTENSI LIMBAH PERTANIAN LOKAL SEBAGAI MEDIA ALTERNATIF BUDIDAYA JAMUR TIRAM

Abstrak

Agricultural waste such as chili stems, corn cobs, and rice straw are abundant biomass resources in Batukarang Village, Payung District, Karo Regency, North Sumatra; however, their utilization remains limited. These materials have strong potential as alternative substrates for oyster mushroom (Pleurotus ostreatus) cultivation, which requires lignocellulosic substrates to support mycelial growth. This study aimed to examine the effects of different agricultural waste-based substrates on mycelial growth and the economic feasibility of oyster mushroom cultivation. The research employed a Completely Randomized Design (CRD) with three treatments: control medium (sawdust, rice husk, bran, and lime), Treatment 1 (local agricultural waste combined with sawdust, rice husk, bran, and lime), and Treatment 2 (local agricultural waste supplemented with bran and wood ash). Observed parameters included the percentage of successful mycelial growth, mycelial growth rate, and economic analysis consisting of Break Even Point (BEP) and Revenue Cost Ratio (R/C). The results showed that Treatment 1 and Treatment 2 achieved 100% optimal mycelial growth, higher than the control medium (80%). Biologically, Treatment 1 exhibited the most optimal mycelial growth rate, while economically, Treatment 2 showed the lowest BEP and the highest R/C value, indicating greater efficiency and profitability. This study demonstrates that the utilization of local agricultural waste as a cultivation substrate not only supports optimal mycelial growth but also improves cost efficiency and promotes sustainable resource use