1. Akıncı Ş (2011) Humic acids, plant growth and nutrient uptake. Marmara Üniv Fen Bilim Derg 23:46–56
2. Soil Survey Investigation Report United States Department of Agriculture Natural Resources Convervation Service;Anonymous,2004
3. Bolat İ, Güleryüz M (1992) The effects of application of Alar on growth and some fruit characteristics of apricot (cv. Hasanbey). Atatürk Univ J Agric Coll 23:101–112
4. Daur İ (2013) Comparative study of farm yard manure and humic acid in integration with inorganic-N on wheat (Triticum aestivum L.) growth and yield. Tarım Bilim Derg 19:170–177
5. FAO (2015) http://faostat.fao.org/site/339/default.aspx . Accessed 27 Mar 2015