World Feeder was developed more for forage rather than hay. It is very drought resistant...grows roots that reach halfway to China. My next best horse hay comes from a field with the Tifton varieties in it, but I have another with Russell Bermuda that also produces very good horse quality hay.
I test for ph every fall after the last cutting, Then test for the fertilizer mix I need in Feb. And I do after each cutting. I apply at the rate recommended from the tests. I burned the fields last month, and will spray 24D for the weeds this week. I have found over the past 50 years, that it is a waste of money to NOT fertilize according to specs. But, I raise hay for hoses...not for grazing cattle. I never put an animal on my prime hay fields. Most aren't even fenced in.
Most pastures around here will be Fescue, bermuda and clover. I will test ph and apply lime in the fall if needed, and spray them with 24D or Grazon, and usually just put out Nitrogen about this time of the year. Most times liquid nitrogen that I put the 24D in. This blend works well for us in north Ga. Fescue starts coming on about now. The bermuda kicks in and takes over about May-Sept, then after it goes dormant in the fall, you can put out nitrogen again and boost the fescue up for a few more months. Lots of people...and I have too.. will over seed perennial rye at that time, and you dang near get year-round grazing like that,