Agronomy and Horticulture Department


Date of this Version



Published in Ecology, Vol. 11, No. 3 (Jul., 1930), pp. 543-557. Copyright 1930 Ecological Society of America. Used by permission.


Grasslands or grazing lands are relatively dry lands. Drought, at least in the surface soil, is always imminent. The necessity for the seedling to make immediate and extensive contact with deeper, moister soil is apparent. The water relation is usually controlling, and the success or failure of the seedling largely depends upon its ability to develop an absorbing system adequate in extent and activity to furnish the necessary supply.