Status and behaviors of phosphorus in major acid agricultural soils in Lampung, Indonesia
1992
Wipartono, S.D.
The soils differed in their acidity (pH and total exchangeable acidity), mineralogical properties, total P content, extractable P, P sorption capacity, and their P fractions (Al-P, Fe-P, and Ca-P). The laboratory study showed that addition of lime as well as rock phosphate, and rice straw increased pH and extractable P of the three soils. The three soils differed in their response to addition of lime, rock phosphate, and rice straw with regard to their pH, extractable P, Al-P, Fe-P, and Ca-P. The effect of treatments also differed depending on whether the samples were leached or unleached during incubation and depending on the time the samples were collected during incubation. The extractable P in leached samples was lower than unleached samples. Addition of silicate lime to the Podzolic soils resulted in higher extractable P but in the Andosol the two sources did not differ in extractable P. The effect of treatments on Al-P, Fe-P, and Ca-P fluctuated with time of sampling but the trends for Al-P and Fe-P were to decrease and Ca-P was to increase although the soils differ in the sampling period when the increase or decrease occurred and depended on whether the sample was leached or unleached.
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