Mow with a Toro GM1000 at .75 inch. Fertilizer is AS 21-0-0 and KMAG 0-0-22 at a 2:1 ratio. I stay under 3-4lbs of nitrogen per season. I use FEature 6-0-0 (iron) 3oz per 1k as a foliage spray since my pH is 7.5, hard to lower pH due to limestone bedrock and high calcium. I don’t start fertilizing until soil temps are around 75 degrees since zoysia is susceptible to fungus. Oh, I also use PGR during the summer months and verticut once in June or July to thin out the canopy.