When looking up fertilized tiles, Quality Fertilizer shows as Deluxe Fertilizer and vice-versa. I can see it here:

HoeDirt.fertilizerLowQuality => GameI18n.GetObjectName(368), // Basic Fertilizer
HoeDirt.fertilizerHighQuality => GameI18n.GetObjectName(919), // Deluxe Fertilizer
HoeDirt.fertilizerDeluxeQuality => GameI18n.GetObjectName(369), // Quality Fertilizer

EDIT: Sorry, got a 404 error when submitting, please delete.