On Jul 28, 9:40 pm, Amos Nomore wrote:
In article . com,

wrote:
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. I have not
fertililized thelawnsince I laid it down (except for the starter
fertilizer). I cut the grass high at the mower's highest setting, and
use a mulching blade. (The mulched clippings are fine enough not to
be visible on thelawn.) I deep soak thelawnthree times a week. I
feel like I'm doing everything "right" but still, it's looking
yellowish. Any suggestions?

You might try letting it dry out a little between waterings. Give the
grass motivation to root deeper.

Iron? 3x per week is too much. Define deep soak? Most grass needs
watering to an inch deep to encourage the roots to grow deeper. How
large an area, what type of sprinklers and how long do they run? Are
you on a slope? Do you use a lawn contractor?

For example:

1000 sq. feet of lawn requires 1000 x .62 gallons (.62 gallons covers
1 sf to a deph on 1 inch) gallons of water to apply an inch of
water.

So, if you have 1000 SF to water, you need to apply 620 gallons of
water per week (abscent rain).

If your sprinkler delivers 3 gallons per minute, you need to water the
same area for 3.44 hours.

If you have a slope, then you still need the same amount of water, but
it must be applied incrementally to prevent runoff.