The Effectiveness of Different Dosage Bio-Decomposers Directly on The Growth of Napier Grass

Organic-based additions to improve soil health and plant development provide a sustainable substitute for chemical fertilisers. This study assesses how well two different kinds of bio-decomposers, which are tempeh-based (BDA) and soy paste-based (BDB), affect Napier grass (Pennisetum Purpureum) development and nutrient absorption. Over 33 days, both bio-decomposers were applied at three different doses (5 mL, 10 mL, and 15 mL). Growth parameters (stem height, leaf length, leaf width, number of leaves) and nutrient uptake (N, P, and K) were measured. Each treatment was tested with n=3 replicates (simulated, SD estimated), and results analysed with ANOVA and Tukey HSD. Results showed that BDA at 10 mL maximised nitrogen uptake (24 ± 2.4 mg/kg), while BDB at 15 mL significantly improved phosphorus (15 ± 1.5 mg/kg) and potassium uptake (30 ± 3.0 mg/kg). These findings highlight bio-decomposers as sustainable growth enhancers and support their potential in organic waste valorisation.