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New Lawn Yellowing
Early this spring, I put down new sod. The grass looked incredibly
healthy for several months. But now, although it's still very thick, the grass is starting to look yellowish. It's not underwatering, as I know the gray-green tinge underwatering causes. Just for grins, try three things: 1) Get down and look at the cut blades closely. Are the tips torn-looking or cut? Sharp lawnmower blades leave a nice "cut" looking edge, while dull ones look ragged. The ragged edge often gives a yellowish or brownish cast to the lawn http://www.floridagardener.com/misc/...nyourblade.htm Also examine the grass blades for brown or yellow or reddish spots or or pustules (a sign of fungal diseases) 2) Lift a piece of sod in the yellowest portion -- not a big piece, or very deep... what you're looking for is to see if the roots are penetrating the soil underneath, if the roots look healthy, and if you see signs of insect activity. Also check to see if the native soil under the sod is as damp as the sod. You can also check for excessive thatch buildup (though I'd be surprised if you have much in this new a lawn). At the same time you do this, collect some of the native soil underneath the sod for soil analysis if you hadn't done that before sodding. At a minimum, I'd like to see soil pH, P, K and Fe. 3) Apply some fertilizer to a small section; something with fairly high ratios of N to P and K. Watch the area for fairly immediate greening up. Be prepared to live with that spot a little greener than the rest of the lawn for a year or three if you do this --------- What species is/are in the lawn? What have the temperatures been like, day and night? What do the local golf course fairways look like? My bets, without more information, are on bad mower blades, heat stress, and pH. |
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