生産性の限界と可能性 保存農業の原則
Cameron M Pittelkow1, Xinqiang Liang2, Bruce A Linquist1
1Department of Plant Sciences, University of California, Davis, California 95616, USA.
Nature
|October 23, 2014
まとめ
耕作なしの農業を含む保全農業は,変動する収穫量に影響を及ぼします. 耕作禁止と残留留と作物交代を組み合わせることで,特に乾燥した気候では収穫量を向上させることができますが,小規模農家にとっては実施の課題があります.
科学分野:
- 農業科学 農業科学とは
- アグロノミーは農学です.
- 環境科学 環境科学
背景:
- 成長する世界の人口を持続可能な方法で養うことは,大きな課題です.
- 保存農業 (CA) は,潜在的な解決策を提供しているが,その有効性に関して議論に直面している.
- CAの原則には,耕作しないこと,残留物の保持,作物交代が含まれます.
研究 の 目的:
- ノータール (NT) と従来の耕作 (CT) を比較したグローバルなメタ分析を実施する.
- 単体でも,他のCA原理と組み合わせても,NTが作物の収穫量に与える影響を評価する.
- 気候変動への適応戦略としてのCAの可能性を評価する.
主な方法:
- 610の研究から5,463のペアリングされた収穫観察のグローバルメタ分析.
- 48の作物と63カ国の従来の耕作と非耕作の比較.
- 異なるCAの組み合わせと気候条件下での収穫反応の分析.
主要な成果:
- 全体として,ノートルディングは,従来の耕作と比較して作物の収穫量を減少させます.
- 収穫の減少は,残留物保持と作物交代と組み合わせると最小限に抑えられます.
- NO-TILLは,他のCA原理と組み合わせて,乾燥した気候における雨水作物の生産性を大幅に増加させます.
結論:
- 持続的な増強へのノートル農業の貢献は,想定より低いかもしれない.
- CAは,特に完全に実施された場合,乾燥地域における気候変動への適応に希望を示しています.
- 資源が乏しい小規模農家のシステムにおけるCA原則の実施における課題は,収穫の損失を避けるために慎重に検討する必要があります.
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