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DCフィールド | 値 | 言語 |
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dc.contributor.author | Sugihara, Soh | en |
dc.contributor.author | Funakawa, Shinya | en |
dc.contributor.author | Kilasara, Method | en |
dc.contributor.author | Kosaki, Takashi | en |
dc.contributor.alternative | 杉原, 創 | ja |
dc.date.accessioned | 2012-01-30T01:10:39Z | - |
dc.date.available | 2012-01-30T01:10:39Z | - |
dc.date.issued | 2012-01 | - |
dc.identifier.issn | 0167-8809 | - |
dc.identifier.uri | http://hdl.handle.net/2433/152412 | - |
dc.description.abstract | In Sub-Saharan Africa, conservation of available soil N during early crop growth, when N loss by leaching generally occurs, is important to improve crop productivity. In a dry tropical cropland in Tanzania, we assessed the potential role of soil microbes as a temporal N sink–source to conserve the available soil N until later crop growth, which generally requires substantial crop N uptake. We evaluated the effect of land management [i.e., no input, plant residue application before planting (P plot) with or without fertilizer application, fertilizer application alone, and non-cultivated plots] on the relationship between soil N pool [microbial biomass N (MBN) and inorganic N] and crop N uptake throughout the ∼120-d crop growth period in two consecutive years. In the P plot, MBN clearly increased (∼14.6–29.6 kg N ha[−1]) early in the crop growth period in both years because of immobilization of potentially leachable N, and it conserved a larger soil N pool (∼10.5–21.2 kg N ha[−1]) than in the control plot. Especially in one year in which N leaching was critical, increased MBN maintained a larger soil N pool in the P plot throughout the experimental period, and a delay of increased MB C:N ratio and a substantial decrease in MBN was observed, indicating better soil microbial N supply for crop N uptake during later crop growth. Therefore, plant residue application before planting should enhance the role of soil microbes as a temporal N sink–source, leading to the conservation of potentially leachable N until later phase of crop growth, especially in years in which N leaching is relatively severe. Although further studies are necessary, our results suggest that plant residue application before planting is a promising option to achieve better N synchronization. | en |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | en |
dc.rights | © 2011 Elsevier B.V. | en |
dc.rights | この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 | ja |
dc.rights | This is not the published version. Please cite only the published version. | en |
dc.subject | Microbial biomass N | en |
dc.subject | Microbial C:N ratio | en |
dc.subject | Land management | en |
dc.subject | Dry tropical cropland | en |
dc.subject | Sub-Saharan Africa | en |
dc.title | Effect of land management on soil microbial N supply to crop N uptake in a dry tropical cropland in Tanzania | en |
dc.type | journal article | - |
dc.type.niitype | Journal Article | - |
dc.identifier.ncid | AA11522739 | - |
dc.identifier.jtitle | Agriculture, Ecosystems & Environment | en |
dc.identifier.volume | 146 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | 209 | - |
dc.identifier.epage | 219 | - |
dc.relation.doi | 10.1016/j.agee.2011.11.008 | - |
dc.textversion | author | - |
dcterms.accessRights | open access | - |
出現コレクション: | 学術雑誌掲載論文等 |
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