Granular biofertilizer amended with Bacillus amyloliquefaciens for growing yardlong bean (Vigna unguiculata subsp. sesquipedalis)

Yardlong bean ( Vigna unguiculata ) is a healthy vegetable that is popular in Southeast Asia. Farmers have frequently used pesticides while planting in order to avoid and eradicate pests. Utilising biofertilizer with microorganisms included to help with growth promotion and disease management is one such tactic. The aims of this study were to (1) produce granular biofertilizer amended with Bacillus amyloliquefaciens to control Sclerotium rolfsii -caused root and stem rot disease and (2) assess its effect on the growth of yardlong bean ( Vigna unguiculata subsp. sesquipedalis ). The bacterium which inhibited S. rolfsii , had the capacity to solubilize phosphate, enhanced the growth of yardlong beanand not antagonistic to Rhizobium TAL 638 was identified as B. amyloliquefaciens (HY 4-3-4). The granular biofertilizer that was created and included this bacterium (at 8.96 Log. number/g) continued to be efficient in inhibiting the mycelial growth of S. rolfsii even after 16 months of storage at room temperature (26–30°C). In the pot, granular biofertilizer was effective to control root and stem rot of the yardlong bean. The yardlong bean's stem length, fresh and dry weight, and number of nodules on the roots were all effectively increased by this granular biofertilizer. In the field, the granular biofertilizer was as effective as a chemical fungicide (mancozeb) to control root and stem rot of the yardlong bean. Thus, employing biofertilizers contributes to environmental sustainability by lowering the amount of chemicals used in growing yardlong bean.