... research in Viet Nam (Barrett and Marsh), including field assessment of the technology 4 5- Best Practice; 4- Fully Satisfactory; 3- Satisfactory overall; 2- Marginally Satisfactory; 1- Weak 3. ... identify inoculant strains of microbes In a workshop setting, to train scientists in methods of strain selection and quality assurance of strains in biofertilisers. Field training of villagers, ... production involves a 3 - stage process. Strains of micro -organisms selected for their effectiveness biological nitrogen fixation, phosphate mobilisation and plant-growth promotion - PGPR are cultured...