Assessing the superiority of Bacillus songklensis strain kca6 along with lime and cow manure to increase white bean yield in cadmium contaminated soil

A study on the co-ordinate use of cow manure and lime with nitrogen-fixing bacteria was conducted on the white bean variety at Phuoc Hung commune. This study was comprised of four treatments T0 (NPK: 40 kg Urea-60 kg P2O5-60 kg K2O per ha); T1 [NPK +2.0 tCaCO3ha-1+ Bacillus songlensis strain KCa6; T2 (NPK+10.0t cow manure ha-1+ Bacillus songklensis strain KCa6) and T3 (NPK+10.0t cow manure ha-1+ Bacillus songklensis strain KCa6) repeated four times. Fertilization with cow manure, lime, along with inoculation of BS strain KCa6 had the best outcome, positively affecting pH, soil organic matter, total nitrogen, available phosphorus and exchangeable potassium. Similarly, the best plant growth and yield traits of white bean such as height, number of pods per plant, seeds number per pod, 1,000 seed weight and fresh yield were achieved under this treatment. The fresh seed productivity increased remarkably up to 16.6% and reduced the cadmium (Cd) accumulation of white bean stems ~38.0%, compared to the control treatment. In addition, cadmium amount in white bean seeds was undetectable across all treatments. The application of N, P and K fertilizers, lime, cow manure associated with Bacillus songlensis strain KCa6 inoculation promoted soil nutrients, plant growth as well as enhanced yield and quality of white bean. Therefore, indigenous Bacillus songlensis strain KCa6 species discovered as a promising species in combination to increase crop yield and improve crop quality on the cadmium contamination soil.