Alkaline lawn soil encourages some weeds, restricts the lawn grasses ability to absorb certain nutrients and can negatively affect your lawn's overall health.
Alkalinity is measured by pH. pH above 7 is alkaline and below 7 is acid. While fine fescue grasses prefer pH of low acidity down to 5.5 most lawn grasses prefer neutral pH between 6.5 and 7.0. Alkaline soil may cause deficiency of iron, zinc, copper and manganese in lawn grass. Iron chlorosis (loss of green colour) in grass, caused by inadequate iron, is a common problem in alkaline soils.
Soil test kits and meters are available for checking the soil pH.
Mulches and Compost
After the pH has been corrected you should repair any bare patches of lawn by applying:
Lime should not be added to lawns unless the soil pH is below 6.0. Liming neutral to high pH lawns can lead to chlorosis, general weakening of grass plants, and eventual death.
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