The availability of fertilizer-P applied of sitiung soli of west sumatra after few weeks of lime applications

A soil from Sitiung, Sumatra Barat was limed to a rate equivalent to 1 x exch. A1 and incubataed for a period of 0, 2, 3, and 4 weeks, respectively. At each end of the incubation period, TSP-32-P at rates of 0, 1.25, 2.50, and 3.75 g TSP were added to 5 kg air-dry soil or equivalent to 0, 100, 200, and 300 kg P/ha. After fertilizer application each pot were planted with wilis soybean variety and harvested 28 days later. Absorption of total P and from fertilizer, and P absorption efficiency of soybean receiving 100 to 200 kg P/ha were not affected by duration of incubation of lime before P fertilizer is being applied. Applying 300 kg P/ha to Sitiung soil previously incubated with lime for at least two weeks resulted in higher absorption of total P and P from fertilizer, and P absorption efficiency compared to lower P rates. (authors). 11 refs.; 2 figs.; 4 tabs