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Ash from bioelectric power plant (B-ash) is basidic by-product. Thus, using it to correct acid soil compared to calcium hydroxide liming was tried out. Completely randomized design consists of 5 treatments: non-liming, calcium hydroxide liming to raise soil pH to 6.5, B-ash: soil, 1: 4 (v/v), B-ash: soil, 1:2 (v/v) and equivalent to calcium hydroxide adding for raising soil pH to 6.5 was used. Growth, yield and yield components of baby corn in B-ash treatments were higher than calcium hydroxide treatment. B-ash treatments could raise soil pH, decrease exchangeable acidity and exchangeable Al and increase available plant nutrients but decrease extractable Fe. Whereas, trace elements were decreased in calcium hydroxide treatment, especially Fe and Mn. Thus, to prevent over-liming, it should add B-ash for adjusting soil pH to 6.5. B-ash in the rate of 1:4, B-ash:soil (v/v) should be applied to strong acid soil without testing lime requirement of the soil and B-ash equivalent to calcium carbonate.
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