Alkaline soils require special procedures for growing grass.
Healthy lawns require adequate amounts of sunlight, moisture and soil nutrients. In addition to these basic elements, lawns need soil with suitable pH levels in order to survive. The pH level indicates the amount of acidity or alkalinity in your soil. Neutral soils contain a pH level near 7.0. Most varieties of grass require a soil pH between 5.5 and 6.0. Alkaline soils require some special treatment to encourage lawn grasses to grow and flourish.
Instructions
1. Test your lawn soil to determine the existing level of nutrients, as well as the pH level of the soil. Soils that are high in alkalinity often contain excessive amounts of sand or clay that make conditions difficult for new grass seeds to sprout and grow. Depending on the composition of your soil, your test results may suggest adding gypsum to reduce the alkalinity. Replace missing nutrients by adding any amendments that your test result recommends.
2. Adjust the porosity of your soil and lower the alkalinity by incorporating vegetative mulch into the topsoil. Work this into your soil the autumn prior to planting your grass to allow adequate time for dispersal. Vegetative mulch slowly decomposes, gradually lowering the pH level in the surrounding soil. This additive also creates a well-drained medium that encourages the growth of healthy grass. Spread a 2- to 3-inch layer of composted leaves, grass clippings or pine needles over the top of the soil in your site. Incorporate this vegetative layer into the top 4 to 5 inches of soil. Use a rototiller to work the ingredients into your existing soil.
3. Purchase a grass variety that tolerates slightly alkaline soils. Although some grasses require acidic soils to grow and survive, some varieties tolerate higher pH levels. Choose Bermuda grass, buffalo grass or Saint Augustine grass.
4. Prepare your alkaline soil for planting in the spring. Use a rototiller to break up any clumps and loosen the soil. Rake the soil smooth to provide a level bed for your grass seed. Broadcast your seeds over the top of your soil, sewing at the rate directed on the seed label. Press the seeds into the soil with a seed roller. Moisten the soil with a light spray of water. Keep the soil slightly moist for the first two to three weeks, gradually reducing the frequency of watering as the grass matures.
5. Leave the grass clippings on your lawn after mowing. This natural fertilizer will decompose over the following months, supplying necessary nutrients, such as nitrogen, to your lawn. This practice helps maintain a suitable pH level in your lawn.
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