Abstract
The effect of gypsum amendment on transport of phosphorus (P) in a Pineda sand (loamy, silicious, hyperthermic Arenic Glossaqualf) was investigated in a leaching column experiment. Phosphorus was either placed on the surface of the soil or mixed with the surface 2 cm depth of soil in the column. Gypsum amendment decreased the transport of P in soil. Compared to the unamended soil, transport of P decreased by 35 and 54% in soils amended with 4.5 and 9.0 M.T./ha gypsum, respectively. The transport of P was further decreased by 74% when P was premixed with the surface 2 cm of soil. The transport of P was not influenced by the SO4 ion from gypsum amendment. Instead, formation of Ca-P precipitate appeared to be responsible for the decreased transport of P in the gypsum-amended soil.
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