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Residual effects of calcium silicate in tropical soils part 2 biological extraction of residual soil silicon



Residual effects of calcium silicate in tropical soils part 2 biological extraction of residual soil silicon



Soil Science Society of America Journal 42(1): 94-97



A modified Neubauer seedling method utilizing rice (Orzya sativa, L.) as a test plant, was employed to study the bioavailability of residual Si in a Hawaiian [USA] Gibbsihumox soil. Adsorbed soil Si was also removed with 0.1 N acetic acid adjusted to pH 3.5 and containing 50 ppm P (phosphate solution). The results show that more Si was extracted by plant and ratoon crops of rice combined than by phosphate solution because of longer extraction time during plant growth and also because of possibly greater efficiency of Si removed by rice roots. Rice seedlings extracted proportionately more native Si than did phosphate solution, which resulted in comparable amounts of applied Si being recovered by the 2 methods, i.e., 8-30% for rice and 13-23% for phosphate extraction. About 55-72% Si applied 5 yr ago was still adsorbed by or precipitated in the soil in a form that these techniques could not measure. The modified Neubauer technique can apparently be efficiently employed to estimate the pool of potentially available soil Si in the highly weather soils of the tropics.

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Accession: 006319518

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