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Crop rotation & germination

Rotation between spring, summer and fall planted crops tends to reduce overall weed problems by interfering with the life-cycles of species that have preferred seasons of germination (Timing of germination). For example, spring germinating weeds will be destroyed during seedbed preparation for summer planted crops, and few spring germinating weeds will replace them because the season is not favorable for their germination. During the summer, fall and winter, some of the remaining spring germinating weed seeds will be eliminated by accidental germination deep in the soil and by consumption by earthworms, carabid ground beetles and other soil fauna (Seed longevity). Hence a summer planted crop decreases future pressure from spring germinating weeds. Similar processes act when rotation occurs between spring and fall planted crops and summer and fall planted crops.