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Nitrogen fertilisation reveals contrasting nitrogen-use efficiency and greenhouse gas emission intensity responses in linseed and oilseed rape

窒素施肥は亜麻仁と菜種における窒素利用効率と温室効果ガス排出強度の対照的な応答を明らかにする (AI 翻訳)

Walthall C, Girkin N, Kevei Z, Warner H, Johnston A

Research Squareプレプリント2026-06-10#その他対象セクター: agriculture
DOI: 10.21203/rs.3.rs-9210555/v1
原典: https://doi.org/10.21203/rs.3.rs-9210555/v1

🤖 gxceed AI 要約

日本語

亜麻仁と菜種の窒素利用効率とGHG排出強度を比較。菜種は施肥増で収量増加するが排出量も増大、排出強度は低下。亜麻仁は低窒素条件下で低排出強度を維持。品種間差より施肥量の影響が大。農業脱炭素化への示唆。

English

This study compares nitrogen use efficiency and GHG emission intensity of linseed and oilseed rape under different N rates. Oilseed rape shows higher productivity but steeper emission increases, while linseed maintains lower emission intensity. Fertilizer rate is the main driver of emissions. Linseed offers potential for low-N, low-emission rotations.

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

日本では畑作における窒素施肥の最適化が温室効果ガス削減に寄与する可能性がある。本結果は、亜麻仁のような低投入型作物の導入が農業部門の脱炭素化に有効であることを示唆するが、国内での実証評価が必要。

In the global GX context

This paper contributes to the global discourse on agricultural decarbonization by quantifying the yield-emission trade-off between crops. It highlights that crop choice can influence emission intensity, relevant for designing low-carbon agricultural systems and meeting national GHG reduction targets.

👥 読者別の含意

🔬研究者:Provides experimental data on NUE and GHG emissions for two break crops, useful for modeling agricultural emissions and developing low-N strategies.

🏢実務担当者:Farmers and agronomists can use the findings to choose crops that balance yield and emissions, particularly linseed for low-N systems.

🏛政策担当者:Offers evidence for policy design on fertilizer taxes or subsidies to promote low-emission cropping systems.

📄 Abstract（原文）

<title>Abstract</title> <p> Break crops vary in nitrogen (N) demand, yet direct comparisons of their nitrogen use efficiency (NUE) and greenhouse gas (GHG) emission intensity are limited. We compared four linseed ( <italic>Linum usitatissimum</italic> ) genotypes with one oilseed rape (OSR; <italic>Brassica napus</italic> ) genotype in a controlled glasshouse experiment across four N fertiliser rates (0-120 kg N ha <sup>− 1</sup> ). Plant growth traits, NUE, daily and cumulative GHG fluxes (N <sub>2</sub> O, CO <sub>2</sub> , CH <sub>4</sub> ) and emission intensity (kg CO <sub>2</sub> e kg <sup>− 1</sup> biomass) were quantified. OSR produced greater biomass, chlorophyll content, and NUE than linseed at all N rates. Absolute GHG emissions rose more steeply with increasing fertiliser in OSR. Consequently, CO <sub>2</sub> e emission intensity increased with N rate in linseed but decreased in OSR, consistent with biomass dilution. Fertiliser rate was the dominant driver of GHG fluxes; crop type had no independent effect on cumulative emissions once N rate was accounted for. Genotypic variation within linseed was negligible compared with crop- and fertiliser-driven effects. These results highlight a yield-emission trade-off: OSR maximises productivity but requires careful N management to control emissions while linseed maintains lower emission intensity under reduced N inputs. Linseed offers potential as a lower-intensity break crop in diversified, low-N rotations. Further field-scale evaluation needed to support agricultural decarbonisation. </p>

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