Abstract
This research is an applied study involving the Al Falah farmer group in West Sumatra, Indonesia and was intended to develop a quality organic fertilizer processing technology based on SNI-7763:2018. A Trichoderma sp. culture was bred using bamboo stems (Schizostachyum brachycladum) on a bran medium in an incubator at 39 °C and 75% RH. Cow feces was air-dried for reduced water content from 82% to 60%, mixed with poultry feces (at a ratio of 60:40), and added with 0.3% Trichoderma sp. culture. The mixture was then stacked at a thickness of 70 cm for 7 days. The fermentation results showed an average fermentation temperature of 58 °C and changes in the pH of cow feces and poultry feces from 8.8 to 7.2 and from 3.6 to 6.8, respectively. The following data were also obtained: macronutrient content N = 2.82%, P = 2.78%, and K = 3.21%; organic matter content = 82.89%; C-organic content = 21.20%; C/N ratio = 7.52; and by-products = 1.02%. Based on the results of this research, the organic fertilizer produced complies with SNI-7763:2018.
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