Bald patches in lawns create an eye sore that ruins the aesthetics of your green expanse. Most lawn problems are caused by improper practices like overfertilizing, over or under watering, gasoline spills or mower blades set at the wrong height. However, poor soil drainage is a common culprit that causes bald spots in lawns. Water logged clay soil can cause bare spots and require soil amendments and new grass seed.
Determine if you have heavy clay soil in the bare patches. Grab a handful of soil and squeeze. Sandy soil will break into clumps and feel dry. Loamy soil will be malleable in the hand and clay soil will release water droplets. Clay soil not only hinders grass' ability to absorb nutrients it also aids in causing root rot.
Dig up the problematic areas, so you are working with a clean slate. Make sure you dig up at least 8 inches of soil.
Spread a 4-inch layer of compost and till with a tiller. Apply a 4-inch layer of builder's sand to improve drainage. Till the soil, so that the sand and compost are well mixed. Be sure that the soil is level with the ground.
Water the area well and apply a fertiliser that is high in phosphorous to jump start the seed's growth. You can use a fertiliser with a NPK (nitrogen, phosphorous and potassium) amount of 1-2-1. Wait until the next day to spread your grass seed.
Spread the grass seed by hand and rake over the top of it to cover the seed with 1/8-inch of soil. Water the area thoroughly. Cover the new seed with peat moss to lock in moisture and protect against wind.
Water your grass seed for the next three weeks twice a day with a light spray to keep the soil moist.
Avoid drying out your grass by keeping it well watered when your fertilise. Nitrogen can cause lawn burn.