Granular fertilizers, as compared to water-soluble fertilizers, take longer time to act, dissolve, and finally release the elements in the soil. Generally, the routine gapping between the application of granular fertilizers tends to be 6 to 8 weeks. This type of fertilizer is categorized under slow-release fertilizer, which acts slowly yet effectively. This means it requires only one application in the growing season. To offer optimal conditions so that your fertilizer dissolves fast in the soil and effectively, it is important to offer water after fertilizing. After fertilizing, within 24 hours, the soil needs to be watered sufficiently to allow granular fertilizers to dissolve.