Covillea tridentata shrub

Covillea tridentata shrub practically killed out by Muhlenbergia porteri. Note extensive occupation of soil accumulation about shrub by grass roots. Maximum level of soil in clump of soil about 8 inches above surrounding surface. Very noticeable amount of organic matter accumulated in soil which presents a sequence of thick layers of loose and platy laminated fine sands in clump. The high probability of this grass may account for its restriction to brush clumps but in plots protected since 1912 on the Jornada, it was also usually so found. Fairly loose soil, the presence of a relativly large amount of organic matter and perhaps shade seem to be conditions necessary for its best development. In addition to the development of some grass cover, planting or seeding the grass in such locations may be an effective means of eliminating the brush. In case the grass is able to smother the brush it will in the meantime develope a protective surface cover more effective than the brush furnished. Spread of grass roots 40 inches from clump, fine fibrous roots at surface plentiful, well occupying the soil mass. Plant soil correlation study number 9. Original photo number 301.