The phospho-compost is a valuable amendment which could be prepared by mixing farm wastes, cattle dung, soil, compost, chopped grasses, crop residues and plant leaves with mussoorie rock phosphate at the rate of 3 per cent of the compostable materials. This mixture is made into slurry so as to provide adequate moisture and after uniform mixing with decomposer fungus/bacteria. The mixture is allowed to decompose in a compost pit for about 60 to 90 days. The moisture is maintained at 60 per cent throughout the period of composting and the compost will be ready for use in 60 – 90 days.
Once the compost is ready, 4kg solid formulation or 400 ml liquid formulation of Phosphate solubilizing bacteria is added per tonne and keep for 21 days for release of fixed phosphate. Phospho-compost is a good source of phosphorus and it can be also used as an effective organic amendment in problem soils.