Assertion: birch's root | /r/HasProperty | at least 81 cm
Facets:
Source sentences:
text: Thrifty stands of white spruce in Manitoba have developed on soils of pH 7.6 at only 10 cm below the surface, and pH 8.4 at 43 cm below the surface (Stoeckeler 1938, USDA Forest Service 1938); rooting depth in those soils was at least 81 cm.