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Figure 1. The amount of nitrogen converted to a plant-available form over time at 68°F or 90°F. Even when soil temperatures are 90°F for 40 days, this widely-used organic fertilizer only relinquished roughly half of the nitrogen that was applied to the turf. (Data and graph courtesy of Wayne Kussow, Professor Emeritus, UW-Madison, Department of Soil Science.)

Figure 1. The amount of nitrogen converted to a plant-available form over time at 68°F or 90°F. Even when soil temperatures are 90°F for 40 days, this widely-used organic fertilizer only relinquished roughly half of the nitrogen that was applied to the turf. (Data and graph courtesy of Wayne Kussow, Professor Emeritus, UW-Madison, Department of Soil Science.)