Soil Water Depletion by Yucca

Abstract

Encroachment of Yucca sp. onto newly cleared rangelands often presents a larger problem than caused by the noxious species initially controlled. Densities of yucca often approach or exceed 5000 plants/ha, potentially depleting soil water and reducing forage production. An evaluation of soil water (0 to 60 cm depths) during April 1971 through August 1975 revealed the yucca-infested rangeland had a significantly lower water content than yucca-free rangeland. Herbage production was also significantly reduced by yucca during years with a higher soil water content. Partially thinning yucca densities did not increase soil water content. Soil water storage was increased only when all yucca was removed.