Other options identified include those relating to plant nutrient management such as the appropriate and rational use of fertilizers (GEO, MUS, PHL, SLV,TUV, UZB), use of ammonium sulphate fertilizers instead of urea, use of a combination of phosphogypsum (hydrated calcium sulphate) and urea, use of composted rice straw instead of fresh rice straw (PHL) and enhanced use of organic fertilizers and biorganic technologies (GEO, TUV).