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18. Thompson,D. J., Stout,D. G. & Moore,T. (1992). Forage Production by for annual cropping sequences emphasizing barley irrigation in southern interior British Colombia, Can. J. Plant Sci. 72,181-185 19. Willey, R. W. (1990). Resource use in intercropping systems. Agric. Water Manage. 17, 215-231

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