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Proper soil preparation is one of the most critical steps in the sod installation process. How well your soil is prepped will determine how well your sod takes and how good your sod looks. For a good, sturdy house you need to have a strong, sturdy foundation. It is the same for your lawn. How well your sod looks will be determined by the soil on which it is layed. If you have ever layed linoleum in your home, you know how just a pebble would leave an unattractive lump in your floor. With sod, a clump of dirt can do the same.
Begin by removing all existing plant growth, rocks, sticks, or any other debris. Then, if necessary, rought grade the area to eliminate any drainage problems. Next, till your soil to a depth of 4"-6" and add any topsoil or soil amendments if needed. It is beneficial to have your soil tested to determine if any pH correcting materials are required for optimum quality of turf. You can also apply a "starter fertilizer" if you choose, but please rake it into the top 3"-4" of soil to prevent damage to the roots. Prior to installation of sod, roll the area to firm the soil and fill in any low spots discovered.
For more information about soil preparation, visit the Turfgrass Producers International resouces center.
It is vitally important that your sod be installed IMMEDIATELY upon delivery. Sod is a living plant and unlike plants you would normally buy at a garden center, sod has no pot full of soil from which absorb moisture and nutrients necessary for plant life. Protect unlaid sod by in hot weather by placing it in a shaded area, covering it with a moist burlap sacking, or by sprinkling it with water.
Begin laying along a straight edge, like a sidewalk or driveway. Butt and push edges up against each other tightly without stretching, avoid gaps and overlays. Stagger the seams in a brick-like fashion. To trim edges to fit along landscape beds or other areas, a utility knife or other sharp knife works best. Avoid laying small pieces along the outer edges as they will have difficulty maintaining proper moisture. If laying sod on a slope, lay pieces perpendicular to the slope instead of up and down. Avoid walking or kneeling on the sod while installing to prevent any indentations or air pockets. After installation begin watering IMMEDIATELY.