My St Augustine lawn has patches of yellow blades, what causes this?

Question:I use Scott's Bonus S lawn food and water regularly.

Answers:
Sounds like a lack of nitrogen. It may be due to the soil. Have a nursery analyze a sample of your grass & soil to see if there's an imbalance there. St. Augustine needs plenty of nitrogen.

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It is an iron problem,and you need to go to the garden center and they will be able to show you what kind of iron product
you need to get to fix this problem.Garden center advice,
Good Luck and happy growing

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