Most of the non-urea fertilisers including the organic which are sold in the market are highly adulterated, revealed a report of the Soil Resource Development Institute. The SRDI analysis report of the 2007-08 fiscal also said that the degree of adulteration in the fertilisers is in some cases up to 77 per cent. The farmers, who cannot discern the standard of the fertilisers, are being cheated by the unscrupulous private fertiliser producers who sell the spurious products in the market, experts said. Random use of these substandard fertilisers also causes yield loss of crops and reduces land fertility, they said. The SRDI has prepared the report based on its laboratory tests of some 3934 fertiliser samples, out of which 2043 were found adulterated. The institute received the samples over last one year from different sea and land ports, law enforcing agencies, different government and private agencies and individuals. The analysis found 21 per cent sample of triple super phosphate, 9 per cent of di-amonium phosphate, 75 per cent of single super phosphate, 26 per cent of muriate of potash and 41 per cent sulphate of potash, 71 per cent of zinc sulphate and boron, 77 per cent of NPKS or mixed fertiliser