Resource competition across the crop-tree interface in a maize-silver maple temperate alley cropping stand in Missouri

By Adrian Miller, S. Pallardy. Agroforestry Systems, 2001

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Production of soybean associated with different hybrid poplar clones in a tree-based intercropping system in southwestern Québec, Canada. (2009, background): “…in crop productivity is greatest at the tree–crop interface, where competition for light (Chirko et al., 1996a,b; Newman et al., 1998), water (Jose et al., 2000; Miller and Pallardy, 2001; Wanvestraut et al., 2004) and nutrients, particularly nitrogen (Allen et al., 2004), is most critical.”
Interspecific interactions in temperate agroforestry (2004, background): “It should be noted, however, that the competitive interactions involving water become more intense as soil water gets depleted (Miller and Pallardy 2001).”
Spatial variation of soil enzyme activities and microbial functional diversity in temperate alley cropping systems (2005, background): “Lower crop yields near trees have been associated with reduced solar radiation (Miller and Pallardy 2001) and water availability (Jose et al. 2000) due to shading and competition with trees.”
The long-term effects of a gliricidia-maize intercropping system in Southern Malawi, on gliricidia and maize yields, and soil properties (2006, background): “Several authors have expressed their fear that competition between trees and crops in a hedgerow cropping system for resources, e.g. for light, water and mineral elements, will reduce the yields of the associated crops (Ruhigwa et al., 1992; José et al., 2000a,b; Miller and Pallardy, 2001).”