7D R BISWAS,S A AALI,M S KHERA.Nitrogen-surphur interaction on the uptake of P,K,Zn,Cu,Feand Mn by gobhi sarson[J].J.Indian.Soc.Soil Sci.,1995,43(2):280-283.
8M VASSILEVA,N VASSILEVA,R AZCON.Rock phosphate solubilization by aspergillus niger on olive cake-based medium and its furtherappilication in a siol-plant system[J].World journal of microbiology & biotechnology,1998,(14):281-284.
9NAGARAJAH S,POSNER A M,QUIRK J P.Desorption of phosphate from kaolinite by citrate and bicarbonate[J].Soil Sci.Soc.Am.Proc.,1968,32:507-510.
10M W WAIGWA,C O OTHIENO,J R OKALEBO.Phosphorus availability as affected by the application of phosphate rock combined with organic materials to acid soils in western Kenya.Expl[J].Agric.,2003,39:395-407.