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Contributions of Sward Population Structure to Herbage Production in Two Growth Stages Relationship Between Nutritive Value Changes and Environmental Factors in Mixed Sward of Perennial Ryegrass/White Clover Studies on Grazing Succession and Stability of Community in Mixed Sward of Perennial Ryegrass/White Clover PROGRESS IN STUDIES OF THE EFFECTS OF DEFOLIATIONON REGROWTH AND PRODUCTION IN GRASS PASTURE