Question: soil is alkaline in lawn?
Answer: 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. ... Iron chlorosis (loss of green colour) in grass, caused by inadequate iron, is a common problem in alkaline soils.