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Additional resources for Check Valve Degradation, Failure Exper. in Nucl. Pwr Ind. (1984-1990) Vol 1

Example text

Neal Stewart, Jr. 1 INTRODUCTION “Weeds evolved, and are still evolving, within the man-made habitat in three principal ways: (a) from colonizers through selection towards adaptation to continuous habitat disturbance, (b) as derivatives of hybridization between wild and cultivated races of domestic species and (c) through selection towards re-establishing natural seed dispersal mechanisms in abandoned domesticates. Domesticates differ from weeds primarily in degree of dependency on man for survival.

Fatua C. nucifera*; feral populations None I. trifida I. aquatica: not I. triloba: not 22 23 24 Group C V. unguiculata* O. europea* S. cereale S. S. S. S. S. 3 (continued) World’s 25 Most Important Food Crops, Related Sexually Compatible Weeds, Weed Importance*, and Weed Geographical Distribution Rank Crop Scientific Name World Area Planteda (M Ha) 25 Grape Vitis vinifera 7 World Yielda (MT) Related Weeds: Compatible (or not) with Crop b 62 Vitis spp. V. aestivalis V. candicans V. hastata V. rotundifolia V.

Volunteer is defined here as crop plants that grow in the same field in subsequent crops or years from a seed bank formed from seed that either shattered from the crop prior to or as a result of harvesting operations or from originally sown seed that did not germinate immediately after sowing. Volunteers rarely persist for more than a season or two, unless they evolve feral traits. At first glance, it would appear that crops going feral should be widespread; many crops have the capacity to volunteer in subsequent crops.

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