Alkaline Lawn Soil
Alkaline lawn soil encourages some weeds, restricts the lawn grasses ability to absorb certain nutrients and can negatively affect your lawn's overall health.
Alakalinity is measured by pH. pH above 7 is alkaline and below 7 is acid. While fine fescues 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 are available for checking the soil pH.
- Plain elemental sulphur (or sulfur) is probably the easiest and most common way to lower the pH of soil. It can be spread on top of the soil. Sulphur is slow-acting, you should not apply more than 1 kg per 10 m2 at any time.
- Lime and Sulphur for Soil pH Adjustment.
- Fertilizers that contain ammonia (such as ammonium nitrate), urea, or amino acids will have an acidifying effect on the soil in your lawn.
Mulches and Compost
- When organic matter breaks down, it tends to make soil more acidic. Regular use of organic compost and mulches will bring the soil pH closer to the neutral to slightly acidic level levels suitable for lawn grasses.
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.
Warm and Cool Season Lawn Grasses
New Zealand has both warm and cool regions. Lawns are most commonly of cool season grasses but in warm regions, particularly coastal areas, warm season grasses can be used for lawns.
How to Use LawnPro 7 Day Green
How to fertilise, green and strengthen your lawn. Kiwicare LawnPro 7 Day Green with the ease-to-use Even-Flo spreader.
Deals with Alkaline Lawn Soil
View all products