Originally Posted by greendoctor
N without anything else can be trouble on centipede unless the soil has adequate K. On centipede, I prefer to apply N, K, and micronutrients all together. No chlorides and no P in the fertilizer. How long is your growing season such that 2 applications will do it? I do agree with using ammonium sulfate as the N source. That has the added benefit of supplying S and aiding in the maintenance of an acid soil pH. Sadly, the only way to reliably get a fertilizer that does not use urea and muriate of potash as nutrient sources is to blend your own. That is what I do in the tank and spray the mix on in 5 gallons. There should be no need to apply 1 lb of N at a time, I get good results applying 1/2 lb N at a time to centipede. .
The growing season goes from April to October. The last cut around here is the first week of November usually. This is only my second full year in the business. I took over these fertilizer program only lawns from a guy I went to school with and just did his 4 app program last year which consisted of pre em, two fert apps, pre em in the fall with spot spraying as needed.
So no, 2 apps is not enough, I think 3 will be. Shouldn't the potash from the pre emergent last fall still be in the soil ready to be used once the grass starts growing? That should make the 21-0-0 AS at 1/2lbN/K ok to use for green up? The Allectus at the max rate per app will give me .82lbsN/K. So this should last until August and then the 10-0-20 SCU is the product JDL recommends for the late summer app on centipede. I know from experience they don't always know what's best.
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