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T HE need for proper management of forage species begins at the time of seeding and continues throughout the life of the plant. The early development of seedlings, which has a direct bearing on ultimate stands and production, is influenced to a considerable extent by time and frequency of defoliation. Very little detailed information is available on the development of young perennial grass and legume plants. Less work has been done to determine the effects of clipping on root development than on top growth. Growth of roots in successive stages of development has received little attention. This is probably largely due to the difficulty of observing closely the parts below ground. 1 Contribution from the Division of Forage Crops and Diseases, B.P.I.S.A.E. Part of a thesis submitted to the Graduate School of the University of Wisconsin in partial fulfillment of requirements for the degree of Doctor of Philosophy.

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Synopsis Potash greatly increased yields of legumes and percent legume in grass‐legume mixtures. Legume percentage was increased almost 100% in mixtures containing ladino clover by high potash fertilization. Birdsfoot trefoil was the only legume which produced significantly more under low lime levels than under high lime and also increased in legume composition of the forage.