Abstract
North Carolina Natural Phosphate (NCNP) is a natural marine sediment, excavated, washed and sold in unprocessed form as a phosphate fertilizer. In vegetation and field experiments carried on in Poland in 1992–1994 with potatoes, rye, maize and winter rape the efficiency of phosphorus in NCNP was in the range of 75–100% of phosphorus in superphosphate. Blending and granulating of NCNP with urea and sulphur proved to be very effective. Further works on blending technology and the usability of NPS or NPKS blends are recommended.
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References
Kêsik K and Fotyma M (1988) Assessment of fertilizer value of superphosphate-ground phosphate rock mixture (in Polish) Pamiêtnik Pulawski 91, pp 185–203
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Fotyma, M., Hammond, L. & Kesik, K. Suitability of North Carolina natural phosphate to Polish agriculture. Fertilizer Research 43, 83–86 (1995). https://doi.org/10.1007/BF00747685
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DOI: https://doi.org/10.1007/BF00747685