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Discusses the effect of management and competition on the phosphorus by rye grass, meadow fescue and their natural hybrid in pure and mixed plots. Reason for the difference between species in their capacities to absorb phosphate; Absorption of nutrients by established crops; Role of phosphate in the root penetration in plants.

Focuses on the variation in growth rates and in the proportion of each species of perennial rye grass, meadow fescue and their natural hybrid. Estimation of the success of the hybrid in competition with its parental species; Growth in the absence of inner-plant competition; Comparison between perennial rye grass and meadow fescue.