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One of the most important technological trends in contemporary agriculture is spatially-variable crop production, unfortunately commonly known by the vague non-descriptive term precision agriculture. Spatially-variable crop production obviously is the management of crop production while understanding and acting upon the spatial variability that is inherent in growing crops. This has been a group of technologies which has seen great research efforts and substantial, although not majority, commercial adoption. The technologies hold out the promise of reducing crop production costs and environmental impacts.