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There are two types of slow-release fertilizers. Organic Fertilizer. The first type is an organic fertilizer. Organic fertilizers are made up of organic materials that must first be broken down by microbial activity before the nutrients are available to the plants. Thus the nitrogen they contain is water-insoluble nitrogen (WIN).
Nov 24, 2015 · A 0.75 to 1.0 lb. follow-up application of nitrogen is usually recommended at this time (late May-June) to maintain an acceptable level of turf quality throughout the summer period where turf managers are on a 6-8 week programming schedule (e.g. LCOs and sports field managers).