More than a decade back we found that Phosphate Rock co composted or mixed with Organic Manure works as efficiently as Di Ammonium Phosphate (DAP) a well known and popular chemical phosphatic fertilizer and published 1, 2 the results in Current Science and Indian Chemical Engineer. This technology termed as Phosphate Rich Organic Manure (PROM) Technology was followed by several research projects sponsored by M/s Rajasthan State Mines and Minerals Ltd involving an expenditure of around forty lacs of rupees (those days) and was validated. The advantage of PROM over DAP is that PROM works equal residual effect in that it is effective for two crops where as DAP is effective for the first crop only which may be noted from Table 1 of reference cited at 3. The scientists involved in the development of this technology formed PROM Society* and published their work in several volumes. Chemical News of Indian Chemical Council published a technical note on PROM as recently as 2012. DAP consumption in India is between three to four million tons. Government of India subsidizes DAP so that farmers can afford to buy DAP. Over the period the subsidy burden increased from 12000 crores of rupees (2002) to 120 000 crores (2010) of rupees. It is heartening to note that PROM is now included in the Fertiliser Control Order (FCO) that will facilitate large scale production of PROM. So far M/s Simbhaoli Sugar Mills, M/s Excel Industries and M/s A 2 Z Infrastructure Ltd conducted large scale commercial trials with PROM. PROM has the potential to reduce the subsidy burden on Government of India due to the equal residual effect it shows. We hope that Government of India provides reasonable subsidy on rock phosphate needed for the production of PROM to put it at equal playing ground with chemical phosphatic fertilisers.
- Sekhar, D.M.R and Aery, N.C, Current Science, Vol.80 (9), (2001). http://www.iisc.ernet.in/currsci/may102001/1113.pdf
- Sekhar, D.M.R., Aery, N.C. and Gupta, D.K, 2002. Indian Chemical Engineer, Vol.44 (3), (2002).
- Sekhar, D.M.R, et al, Phosphate rich organic manure as fertilizer, http://precedings.nature.com/documents/2411/version/1