Effects of Charcoal Pore Size on Nitrate Retentiveness

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  • MORI Akinori
    Shikoku Natl.Agric.Exp.Stn.:(Present address)Natl.Inst.Livest.Grassl.Sci.
  • FUJINO Masatake
    Shikoku Natl.Agric.Exp.Stn.:(Present address)Natl.Agric.Res.Cent.West.Reg.
  • TAKEZAKI Akane
    Shikoku Natl.Agric.Exp.Stn.:(Present address)Natl.Agric.Res.Cent.West.Reg.

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  • 木炭の孔隙特性が硝酸イオンの保持機能に及ぼす影響
  • モクタン ノ コウ ゲキ トクセイ ガ ショウサン イオン ノ ホジ キノウ ニ オヨボス エイキョウ

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Abstract

The application of charcoal to the soil has a number of effects on the soil's chemical, physical and biological properties. Soil conditioning with charcoal sometimes results in improved crop yields, although at present it is not known which characteristic of charcoal promotes plant growth. This study was performed to investigate the degree to which charcoal retains nutrients, including nitrates. Two kinds of charcoal, made from Larix kaempferi (Japanese White Larch) and Quercus phillyraeoides (Ubame Oak) were employed. Conclusions obtained are summarized as follows. 1) The porosities of L.kaempferi charcoal and Q.phillyraeoides charcoal were 69% and 31% respectively. The median pore size of L.kaempferi charcoal was larger than that of Q.philly-raeoides charcoal. 2) The amount of nitrate adsorbed by the two charcoals was investigated as a function of pH. Nitrate adsorption by both charcoals increased with reduced pH, but at the same pH, nitrate adsorption by Q.phillyraeoides charcoal was greater than that of L.kaempferi charcoal. 3) The release of nitrate from 2-4 mm-diameter charcoal pellects presaturated with 10 mmol L^<-1>KNO_3 was analyzed to evaluate the nitrate-retentive ability of granulated charcoals. Greater amounts of nitrate were retained in L.kaempferi charcoal than in Q.phillyraeoides charcoal. 4) The movement of nitrate in charcoal-added soil columns was investigated. The amount of nitrate retained in the upper part of the column increased with addition of charcoal to the soil.

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