6JELENIC D B,HAJDUKOVIC M,ALEKSIC Z.The influence of humic substances on phosphate utilization from labelled super- phoaphate [A]. FAO/IAEA. The Use of Isotopes in Soil Or- ganic Matter Studies [ C ].New York : Pergamon Press, 1966.85-88.
7FAGBENRO J A,AGBOOLA A A.Effect of different levels of humic acid on the growth and nutrient uptake of teak seedlings[J].Plant Nut, 1993,16(8) : 1465-1483.
8ASIK B B,TURAN M A,CELIK H,et al.Effects of humic substances on plant growth and mineral nutrients uptake of wheat (Triticum durum cv. Salihli)under conditions of salinity[J]. Asian Journal of Crop Science, 2009,1 (2) : 87-95.
