Types and Forms of Nutrient Sources - Environmental Considerations
When fertilizing lawns, particularly with quick-release nutrients, it is important to consider the weather and turfgrass conditions to achieve maximum effectiveness of the applied fertilizer. Ideal conditions include a cool day with about ¼ to ½ inch of slow, steady rainfall or watering immediately following the fertilizer application to move the fertilizer off the leaves and into the soil. As the temperature increases, the potential for damaging the leaves through fertilizer burn increases; consequently, care must be taken by applying a lower rate of fertilizer, using slow-release forms, or washing fertilizer off the leaves immediately after application. Fertilizer application using quick-release nutrients should be significantly reduced or avoided when air temperatures are higher than 85°F.