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Ring Growth of Plants¹

ABSTRACT

This paper discusses the spectacular rings formed among stands of ringgrass (Muhlenbergia torreyi) and mentions that this type of growth occurs in many places and among many plants in the arid and semiarid Southwestern States. Brief physical and chemical characteristics of soils where ring growth occurs are given and speculations are made about conditions that contribute to formation of the rings.

¹ Contribution from Soil Survey, Soil Conservation Service, U.S.D.A. Presented before Div. V, Soil Science Society of America, Dallas, Texas. Nov. 18, 1953.

² Soil Correlator for Arizona and Nevada, Soil Survey, Soil Conservation Service U.S.D.A. Greatful acknowledgment is made to James P. Thorne, S.C.S. Laboratory, Logan, Utah, and Reuben E. Nelson, Soil Survey Laboratory, Riverside, California, for laboratory analyses, and to the following who assisted by identifying the plants discussed in table 1: Dr. W. S. Bohle and Prof. Arthur Holmgren, Agr. Exp. Sta., Logan, Utah; J. A. Downs, Nursery Manager, S.C.S. Albuquerque, New Mexico; Dr. Philip Munz, Pomona and Claremont Colleges, Pomona, California; and Morris Williams, Range Specialist, S.C.S., Albuquerque, New Mexico.

Received for publication July 6, 1956. Accepted for publication April 4, 1957.