The potential benefits of different covercrops, biological control amendments, and vegetable rotation on soil chemical and biological properties, crop development and yield, and disease development in organic vegetable production, as represented by legume(green bean, Phaseolus vulgaris), cucurbit (yellow summer squash, Cucurbita pepo), and solanaceous (sweet pepper, Capsicum annuum) vegetable crops, were evaluated in a multi-year field trial in Maine, USA.