Arboriculture Terms

xylem that develops in a twist as it ascends the trunk or limbs of woody plants.

soil with relatively low levels of soluble salts and a concentration of sodium high enough to adversely affect soil structure (symptoms include waterlogging. erosion. soil surface crusting. and poor plant growth). Soils > 12 SAR (see sodium absorption ratio).

measure of soil sodium content. Ratio of sodium ion concentration to that of calcium (Ca) and magnesium (Mg) (soluble salts) (see sadie soils).