A green mussel peeler in Mauk Tangerang can produce 207.76 kg of shell waste in one day. Green mussel shell (Perna viridis) contains macronutrients, including P (0.09%), K (0.02%), Ca (52.50%), Mg (0.07%), S (0.03%), and has a pH of 9.4. This study aimed to determine the appropriate dose of green mussel shell (GMS) waste for the growth and production of bok choy. The study was conducted at the experimental field of the Faculty of Agriculture, Universitas Muhammadiyah Jakarta, from August to November 2021. The study used a Randomized Complete Block Design with five treatments and five replications. The treatments were inorganic fertilizer as control (300 kg/ha NPK); 0.4 ton/ha GMS powder + 100 kg/ha urea; 0.8 ton/ha GMS powder + 100 kg/ha urea; 1.2 ton/ha GMS powder + 100 kg/ha urea; and 1.6 ton/ha GMS powder + 100 kg/ha urea. Application of GMS powder increased soil pH from an initial 4.1 to a final range of 6.95–7.15, and bok choy growth and yield were not significantly different from the inorganic fertilizer control (one-way ANOVA, p > 0.05). At the tested doses, GMS powder + urea produced bok choy growth and yield statistically comparable to the recommended inorganic fertilizer; however, longer-term field trials and safety screening are recommended before broad adoption.
Elfarisna et al. (Thu,) studied this question.