Lime will help reduce the acidity of the soil bringing it to a more neutral range to allow better catatonic exchange between roots and nutrients in soil. This allows the nutrients to move throughout the soil which makes it easier for the roots to extract what they need from the soil.
Healthy Lawn uses pelletized dolomitic lime, which contains carbonates of both calcium and magnesium. Another source of lime is limestone or calcium carbonate, which is mined as a rock, ground and processed for agricultural use. Newer liming materials have been developed recently that may be utilized in select markets.
The value in using a dolomitic lime is that both magnesium and calcium are supplied to the soil. Magnesium is a stronger alkaline source than calcium but calcium is more necessary for plant nutrition than magnesium. Pelletized dolomitic lime has a 4:1 ratio – four parts calcium to one part magnesium.
Below are the effects of soil pH for catatonic exchange capabilities for turfgrass roots and the uptake of broadleaf weed control into the targeted weed.
Low soil pH
PLANT SURVIVABILITY can be significantly compromised, under low soil pH conditions, because:
THE MAJOR PLANT NUTRIENT PHOSPHORUS becomes fixed into unavailable compounds with aluminum and iron.
AT SOIL pH LEVELS BELOW 5.0, the minor elements zinc, copper, manganese, boron and molybdenum are restricted.
AS SOIL pH LEVELS DECLINE more hydrogen ions occupy exchange sites, reducing the number of locations at which plants
WITH HYDROGEN IONS OCCUPYING exchange sites, highly soluble forms of nitrogen fertilizers can rapidly leach out of the plant root zone and into the ground water.
DUE TO INCREASED LEACHING that occurs at low soil pH levels, potassium, calcium and magnesium levels can be significantly reduced.
High soil pH
LIKE LOW SOIL pH, high soil pH causes a restriction of essential plant nutrients, because there is:
INCREASED LEACHING of plant available forms of nitrogen, ammonium (NH4+) and nitrate (NO3?).
INCREASED VOLATILIZING OF NITROGEN, above a soil pH of 7.2, as ammonia gas (NH3). When lost into the atmosphere in significant amounts, ammonia gas can be toxic to turfgrass.