Research on using Bacillus bacteria capable of insoluble phosphorus solubilisation in fermentation of chicken waste as liquid microbial organic fertiliser

Phosphorus-degrading bacteria help convert insoluble phosphorus into a readily digestible form that plants can use. This source of bacteria is widely used in the treatment of wastes containing highly insoluble phosphorus. This study determined the suitable factors for the fermentation of chicken waste to make liquid microbial organic fertiliser using two strains of bacteria Bacillus subtilis L16 and B. amyloliquefaciens L26 with the following conditions: the rate of breeding 5% v/v (with the density of 108 CFU/ml, ratio of 2 bacterial strains is 50-50), pH 7, temperature 30oC for 8 days. The quality of liquid microbial organic fertiliser from chicken waste meets the QCVN 01-189/BNNPTNT criteria with an organic substrate content of 30.66%, bio-available phosphorus of 1.57%, the density of Bacillus bacteria reached 5.55x109 CFU/ml, and no Salmonellaand Escherichia coli causing disease. The results of using liquid microbial organic fertiliser increased tomato fruit growth and yield by 12.9% than that of the control using NPK fertiliser.