メタン発酵消化液の施用方法の違いが水稲の生育に及ぼす影響

The nutritive effect on rice （Oryza satiua，L）growth of two different application of liquid phase of digested organic waste （LPD）was investigated.This study was carried out with a pot experiment in 2005.This LPD was applied on the surface or incorporated into the upper layer of soil.Surface application of LPD decreased tiller number and shoot dry weight.However，there was no significant difference in ear dry weight.The gross recovery rate of applied nitrogen from surface application of LPD was less than that from incorporation of LPD and chemical fertilizer.So the dry matter production efficiency per applied nitrogen was low by surface application of LPD.This suggests that ammonium nitrogen in LPD might be lost through volatilization by the surface application， because LPD was alkaline.From the results， it is concluded that the nutritive effect of LPD is equal to chemical fertilizer when it is incorporated into the soil.有機性廃棄物由来のメタン発酵消化液（発酵液肥）の施用方法の違いが水稲の生育に及ぼす影響を検討するため，水稲のポット栽培試験を実施した．発酵液肥の施用方法は全層施用と表面施用とし，対照として化肥全層区と化肥表面区，および無肥料区を設けた．栽培の結果，液肥全層区は化学肥料を施用した区と同等の生育を示したが，液肥表面区では見かけのN利用率が低く，栄養成長で化学肥料を施用した区に劣った．これは，発酵液肥中のNの約63％を占めるNH4-Nが土壌表面から揮散損失したためであると推察した

Effect on Rice Growth of the Different Application of Liquid Phase of Digested Organic Waste

The nutritive effect on rice （Oryza satiua，L）growth of two different application of liquid phase of digested organic waste （LPD）was investigated.This study was carried out with a pot experiment in 2005.This LPD was applied on the surface or incorporated into the upper layer of soil.Surface application of LPD decreased tiller number and shoot dry weight.However，there was no significant difference in ear dry weight.The gross recovery rate of applied nitrogen from surface application of LPD was less than that from incorporation of LPD and chemical fertilizer.So the dry matter production efficiency per applied nitrogen was low by surface application of LPD.This suggests that ammonium nitrogen in LPD might be lost through volatilization by the surface application， because LPD was alkaline.From the results， it is concluded that the nutritive effect of LPD is equal to chemical fertilizer when it is incorporated into the soil.有機性廃棄物由来のメタン発酵消化液（発酵液肥）の施用方法の違いが水稲の生育に及ぼす影響を検討するため，水稲のポット栽培試験を実施した．発酵液肥の施用方法は全層施用と表面施用とし，対照として化肥全層区と化肥表面区，および無肥料区を設けた．栽培の結果，液肥全層区は化学肥料を施用した区と同等の生育を示したが，液肥表面区では見かけのN利用率が低く，栄養成長で化学肥料を施用した区に劣った．これは，発酵液肥中のNの約63％を占めるNH4-Nが土壌表面から揮散損失したためであると推察した