Summary
This eight-year field study in northern Germany quantified crop yield reductions in a short-rotation coppice alley cropping system as a function of tree proximity and height. Competitive effects were localised to zones immediately adjacent to tree rows (1 m for all crops; 4 m for maize), with tree height exerting a significant negative effect only on spring barley yields. The authors recommend managing poplar harvesting intervals to limit tree height and minimise yield losses in temperate alley cropping systems.
Regional applicability
The study was conducted in northern Germany (Wendhausen) under temperate conditions broadly comparable to southern and central UK farming environments. Findings on competitive zone distances and tree height management should be transferable to UK agroforestry adoption, though site-specific factors (soil, microclimate, tree species) may modulate outcomes.
Key measures
Dry matter yields of winter wheat, winter oilseed rape, silage maize, and spring barley; tree height; distance from tree row (1 m, 4 m, 24 m); relative yield reduction compared to open cropland
Outcomes reported
The study measured dry matter yields of four crops (winter wheat, winter oilseed rape, silage maize, spring barley) in an alley cropping system as a function of tree height and distance from tree rows, compared to treeless cropland. Relative crop yields were significantly reduced proximal to tree rows, with competitive effects limited to zones immediately adjacent to trees.
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