南・東南アジアにおけるイネ収量、窒素利用効率、温室効果ガス削減を改善するスマート土壌肥沃度管理
Smart soil fertility management for improving rice yield, nitrogen use efficiency, and greenhouse gas mitigation across South and Southeast Asia (原題)
S. M. Mofijul Islam, Mohammad Nazrul Islam, Umme Aminun Naher, F. H. Rahman, A. T. M. Sakhawat Hossain, Md. Khalid Hasan Milu, Aminul Islam, Afsana Jahan, Mehedi Hasan Khan, Yam Kanta Gaihre, Md. Rafiqul Islam
🤖 gxceed AI 要約
日本語
南・東南アジアの水稲作を対象に、スマート土壌健康管理手法（SSHMPs）の収量・窒素利用効率（NUE）・温室効果ガス（GHG）削減効果を109研究の系統的レビューで統合。SSNMやNutrient Expert®は収量6–18%・NUE20–117%改善、INMは収量8–28%・土壌有機炭素14–60%増、AWD灌漑はGWPを約20–36%削減した。効果は文脈依存でトレードオフもあり、導入には政策と普及の連携が必要と結論。
English
A PRISMA systematic review of 109 studies synthesizes smart soil health management practices (SSHMPs) for rice across South and Southeast Asia. SSNM/Nutrient Expert® raised yield 6–18% and NUE 20–117%; INM increased yield 8–28% and SOC 14–60%; AWD cut GWP ~20–36% mainly via lower CH₄, with possible N₂O trade-offs. An integrated framework links soil fertility technologies to productivity, nutrient cycling, SOC, GHG balance, and adoption constraints, stressing context-dependence and the need for coordinated policy and extension.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本企業の食品・農業サプライチェーンにとって、Scope 3（カテゴリ1）の農業由来排出削減や調達先のNUE改善に直結する知見。SSBJ/TCFDのScope 3開示やSBTiフラグ目標の達成手段として、アジア調達米のGHG削減オプションを検討する際に有用。
In the global GX context
For global disclosure, this review provides empirical mitigation options for agricultural Scope 3 (category 1) emissions and NUE, relevant to SBTi FLAG targets and CSRD/ISSB supply-chain reporting. It adds region-specific evidence on AWD and nutrient management trade-offs that can inform transition planning and supplier engagement in Asian rice value chains.
👥 読者別の含意
🔬研究者:アジア水稲体系におけるSSHMPsの収量・NUE・GHGトレードオフを統合した定量エビデンスとして、メタ分析やモデル研究の基盤になる。
🏢実務担当者:調達米のScope 3削減やNUE改善策として、AWDやSSNM、UDPの導入検討とサプライヤーへの働きかけに活用できる。
🏛政策担当者:農業GHG削減と食料安全保障を両立するには、SSNM/AWDの普及拡大に向けた政策・普及体制の設計が鍵となる。
📄 Abstract（原文）
Rice (Oryza sativa L.) provides food to more than 3.5 billion people and is cultivated on approximately 165 million hectares worldwide. Continuous intensive rice cultivation over recent decades has caused serious soil organic carbon (SOC) decline, macronutrient imbalances, and an increase in greenhouse gas (GHG) emissions, primarily methane (CH₄) and nitrous oxide (N₂O). Almost all smallholder systems rely on conventional fertilizer management, resulting in critically low nitrogen use efficiency (NUE). However, integrated systems-level evidence of the synergistic performance of smart soil health management practices (SSHMPs) across regions and agro-ecological contexts remains limited. A systematic review with narrative synthesis, following PRISMA 2020 and the Synthesis Without Meta-analysis (SWiM) guideline, a systematic search of five electronic databases (Web of Science, Scopus, PubMed, Google Scholar, and FAO AGRIS) was conducted, yielding 240 records. Following duplicate removal and systematic screening, 109 studies encompassing peer-reviewed field experiments, meta-analyses, review articles, and technical reports were included in this review. Site-specific nutrient management (SSNM) and the Nutrient Expert® (NE®) tool improved rice yield by 6–18% and NUE by 20–117% over farmer practice. Integrated nutrient management (INM) increased grain yield by 8–28% and SOC by 14–60% in long-term trials. Controlled-release urea reduced ammonia losses by 23–62%. Alternate wetting and drying (AWD) irrigation reduced global warming potential (GWP) by about 20–36%, primarily through lower methane (CH₄) emissions, with generally no yield penalty, although this benefit can be partly offset by higher nitrous oxide (N₂O) emissions, depending on water and nitrogen management. In Bangladesh, urea deep placement (UDP) raised yield by 10–21% while saving 25–33% of nitrogen. SSHMPs offer real potential for rice productivity, NUE and GHG mitigation, but their performance is context-dependent and subject to trade-offs. The novel contribution of this review is an integrated conceptual framework, supported by a structured semi-quantitative cross-technology synthesis, linking soil fertility technologies to productivity, nutrient cycling, soil organic carbon, greenhouse gas balance, soil health and adoption constraints. Scaling them requires coordinated policy and targeted extension.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s44378-026-00316-8first seen 2026-10-09 04:39:45
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