| 摘要 |
A fertilising composition comprising an inorganic matrix insoluble in water but soluble in the organic acids released by the plant roots into the rhizosphere, wherein said matrix comprises in turn one or several double salts of phosphorus with calcium or magnesium, and one of the metals chosen from Fe, Al, Mn, Cu, Zn, B and Co, with the condition that the Al is chosen only when the other element of the double salt is Mg, and wherein the double salts are optionally chemically associated to organic compounds with chelating ability by means of metal bridges. The composition may further contain an initiating fraction formed by soluble salts of Fe, Al, Mn, Cu, Zn, B and Co, and one or several components chosen from nitrogen and potassium sources, organic matter sources, nitrification or urea hydrolysis inhibitors, phytoregulators and pesticides may optionally be incorporated thereto; a method for preparing the fertilising composition and a method for fertilising the soil are also provided. |
