George T S,Turner B T,Gregory P J, et al. Depletion of organic phosphorus from Oxisols in relation to phosphatase activities in the rhizosphere[J]. Soil Sci, 2006, 57(1): 47 -57.
[3]
Tarafdar J C,Claassin N. Organic phosphorus compounds as a phosphorus source for higher plaints through the activity of phosphatase produced by plant roots and microor ganisms[J]. Biol Fertil Soil, 1988,5 (4): 308-312.
[4]
Tarafdar J,Claassin N. Preferential utilization of organic and inorganic sources of phosphorus by wheat plant[J]. Plant and Soil, 2005, 275(1-2): 285-293.
Guppy C N,Menzies N W,Moody P W, et al. A simplified sequential phosphorus fractionation method[J]. Soil Sci. Plant Annual, 2000, 31(14): 1981-1991.
[7]
Paniagua A,Mazzwino M J,Kass D, et al. Soil phosphorus fractions under five tropical agr-ecosystems on a volcanic soil[J]. Aust J Soil Res., 1995, 33: 311-320.