4Chad R. Reid, Dean L. Winward, Richard T. Koertig. A Compari- son of Liquid Phosphoric Acid and Dry Phosphorus [ J ]. Soil Sci- ence and Plant Analysis. 2004, (35) : 1,39 - 50.
7Hettiarachchi, G. M. , Lombi, E. , McLaughlin, M. J. , Chittlebor- ough, D. , & Self, P. (2006). Density changes around phosphor- us granules and fluid bands in a calcareous soil. Soil Science So- ciety of America Journal,70(3 ) :960 -966.
8Ben - Gal, A. , & Dudley, L. M. ( 2003 ). Phosphorus availability under continuous point source irrigation. Soil Science Society of America Journal,67(5) :1,449 - 1,456.