I have a link to a publication on bermuda grass care.
When I took a garden series class the the local extention, one of the classes was on lawn care. I learned some shocking things. Most of us take our lawns for granted and don't do everything that is recommended or even much of anything unless we notice a problem.
Did you know that grass is one of the most high maintenance mono crops you can grow? It has a relatively high water and fertilizer requirement and requires frequent mowing, weeding, and pest control to keep it looking good.
New lawns require more frequent feedings, but older lawns don't really need much phosphorus, mostly nitrogen. Grass needs to be given fertilizer during the growing season. A soil test should be performed every couple of years to determine if you need to adjust for pH or any other elements that may be needed.
Thatch can build up creating dead patches in the lawn. Dethatching should be done twice a year with a dethatching rake or a vertical lawn mower to keep thatch less than 1/2 inch thick
Here's the kicker.
Lawns should be renovated every seven years or so.
Most of us have grass that is twenty years old. It is compacted and not really watered and fertilized enough and 50% or more of it is weeds, but I never thought to renovate it.
I'm thinking the lawn could probably use some aeration, dethatching and top dressing and dethatching. It will improve the health of the grass in the long run.
https://www.clemson.edu/extension/hgic/p ... c1216.html
https://plantscience.psu.edu/research/ce ... ets/thatch
Happy gardening in Hawaii. Gardens are where people grow.