- Today, our interns fertilized the Highlands with a granular product. This application occurs biweekly as a part of our fertility program that consists of applying an equal balance of granular and liquid fertilizer. After the fertilizer is a applied a water cycle is ran to prevent any fertilizer burn. Before the application the fertilizer is calibrated to make sure the correct amount is applied. During calibration we measure the length of the throw; each applicator measures it by their own paces so they know how many paces to take between each pass.