soil alkalinity A soil is said to be alkaline when the measured pH (see soil acidity ) is above about 8.0. Above pH 8.5 usually implies a content of free lime or common salt (sodium chloride) in the soil; while many less alkaline surface soils sit above chalk or limestones, or contain limestone rocks. Saline soils should definitely be avoided for viticulture, but some of the best vineyard soils in cool climates are associated with limestone or chalk . Soils high in free lime can create nutritional difficulties through the reduced availability of potassium . High lime and pH can also induce deficiencies...
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