Silicon availability of the nursery bed soils and effects of silicon fertilizer applied on the growth and silicon uptake of rice (Oryza sativa L.) seedlings
2006
Heinai, H.(Tohoku Univ., Sendai (Japan)) | Saigusa, M.
Silicon availability in 36 commercial nursery bed soils was evaluated by four methods the phosphate buffer (pH 6.2, 40 mmol L-1), incubation, supernatant and acetate buffer (pH 4.0, l mol L-1) methods. The influence of silicon availability in the nursery bed soils on the silicon uptake of rice (Oryza sativa L. cv. Hitomebore) seedlings and the effect of silicon fertilizer application were examined in a glass house in 2002. The results revealed that the best correlation between silicon content in rice seedlings and available silicon in soils was obtained with the phosphate buffer-solution method (gamma = 0.86). More precise evaluation of available silicon was achieved by grouping soils based on these phosphate absorption coefficients (PAC). The correlation coefficients between silicon content in rice seedlings and available silicon in soils were 0.92 and 0.72 for volcanic soils (PAC1500) and non volcanic soils (PAC1500), respectively. We concluded that the phosphate buffer method is the most easily adjusted method for estimation of silicon availability in nursery bed soils, and silicon fertilizers should be applied when silicon availability in non-volcanic nursery bed soils goes below 200 mg kg-1, whereas the level is less than 350 mg kg-1 in volcanic soils.
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