中国のフライアッシュ(鄭州産)を利用したケイ酸カリウム肥料の試作とその肥効

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The effects of the potassium silicate fertilizers, made of fly ash from Chinese electric power stations, on the growth and absorption of nutrients (K, Si and others) were compared with those from Japanese fly ash. Three types of fly ash mixture were prepared for calcination. The first one was Japanese fly ash mixed with KOH and Mg(OH)_2 (Japanese ash); the second one was Chinese fly ash mixed with KOH and Mg(OH)_2 (Chinese ash I); and the third was Chinese fly ash mixed with KOH, Ca(OH)_2 and Mg(OH)_2 (Chinese ash II). Each fly ash mixture was calcined at 750, 850 or 950℃ for 30 min, respectively. Chemical analysis of these nine potassium silicate fertilizer samples revealed that six samples calcined at 850 or 950℃ almost cleared the Japanese official standard for commercial fertilizer, but those calcined at 750℃ did not. Wheat plants were grown in pots for 55 d using these potassium silicate fertilizers. Dry weight and K uptake of the plants grown with the fertilizers prepared from Chinese ash I and II calcined at 850℃ were greater than those grown with the fertilizers prepared from Japanese ash orordinary chemical fertilizer. The weights of the ears and polished grains of the plants grown with potassium silicate fertilizer prepared from Chinese ash II calcined at 750 or 850℃ were greater than those of the control plot. In this case, the K uptake in the whole plant was almost equal to that of the control plot. In conclusion, the potassium silicate fertilizer prepared from Chinese ash II calcined at 850℃ was effective as a silicate fertilizer as well as a slow-release potassium fertilizer. It is also presumed that Chinese ash I calcined at 850℃ is also effective.
社団法人日本土壌肥料学会の論文
2000-06-05

中国のフライアッシュ(鄭州産)を利用したケイ酸カリウム肥料の試作とその肥効

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