1. OECD/FAO, OECD-FAO Agricultural Outlook 2014, OECD Publishing, Paris, 2014
2. P. Marschner and Z.Rengel, in Marschner's Mineral Nutrition of Higher Plants, ed. P. Marschner, Academic Press, San Diego, 3rd edn, 2012, pp. 315–330
3. Wheat grain yield response to and translocation of foliar-applied phosphorus
4. V. Fernández , T.Sotiropoulos and P.Brown, Foliar Fertilization: Scientific Principles and Field Practices, International Fertilizer Industry Association, Paris, France, 2013