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Rothamsted's Woburn Ley‐arable experiment, started in 1938 on a sandy loam soil, provides valuable real‐world data on the effects of all‐arable and ley‐arable rotations. In this study, six rotations were compared from 1973 to 2001. Two had 3‐year arable “treatment” crops, two had 3‐year leys, and two had 8‐year leys; the leys being all‐grass given fertilizer nitrogen (Ln3 and Ln8), or grass/clover...