Hopefully someone can help. Two years ago I layed 1600 sqft of tifway 419 sod. It grew great the first year with the overseed then when summer came around it was horrible yellow and some green patchy even after i put on summerizer fertalizer. Then I did my backyard and that looked great until this summer and now its the same as the front. Its very yellow with some green spots that seem to grow great. I live in arizona with plenty of heat and I water every 3rd day for about 20min The grass is in full sun until about 5pm or so both in the front and the backyard. I mowed it short early may to get rid of the winter grass. Does anybody have any ideas for me? Thank in advance.