Barely Significant
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When do cover crops reduce nitrate leaching? A global meta-analysis.

Glob Chang Biol · 2022 · PMC9328130 · PMID 35583665

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a clear trendno p-value reported
Although a clear trend of reduction in nitrate leaching by cover cropping is evident across crop species and soils, further studies can more extensively and reliably guide farmers', stakeholders', and policymakers' decisions toward the best cover crop management practices.

also in 19,460 other papers

a decreasing trendno p-value reported
Our findings are in agreement with the previous meta‐analysis that reported a decreasing trend of cover crops efficacy in reducing nitrate leaching across coarse‐, medium‐, and fine‐textured soils (Thapa et al., 2018 ).

also in 47,180 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.