PHOSPHORUS FRACTIONS AND AVAILABILITY IN SRI-LANKAN ALFISOLS

被引:37
作者
SATTELL, RR
MORRIS, RA
机构
关键词
D O I
10.2136/sssaj1992.03615995005600050029x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Phosphorus is the second most limiting element in the Alfisols of tropical Asia and Africa. The relationships between P fractions in 12 Sri Lankan Alfisols and P taken up by plants in a greenhouse experiment and P removed by rive chemical extractants were examined. Soils were selected to represent different land uses and catena positions. Sufficient P to elevate soil solution concentrations to 0.2 mug P g-1 was applied to one set of samples. A second set received 75% of the P applied to the first and a third received no P. Phosphorus uptake by foxtail millet [Setaria italica (L.)] was determined after 25 d of growth in a Neubauer experiment. Soil P was fractionated sequentially into labile (removed by 0.5 M NaHCO3) and moderately labile (removed by 0.1 M NaOH) inorganic and organic P as well as more stable soil P components. On average, 45% of total soil P was in the NaOH fraction and, of this, 72% was in an organic form. Plant P was significantly related to labile inorganic (NaHCO3-P1) and moderately labile organic (NaOH-P(o)) fractions. Double-acid P (extracted with 0.5 M HCI plus 0.0125 M H2SO4) was significantly related to the same fractions. Moreover, double-acid P was better correlated with plant P than was P removed by those extractants highly correlated only with labile inorganic P. The study suggested that the moderately labile organic P fraction as well as the labile inorganic P fraction contributed significantly to P uptake from tropical Alfisols and that the double-acid extractant was superior to soil P extractants that are uncorrelated to the moderately labile organic P fraction.
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页码:1510 / 1515
页数:6
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