In many cases, fertilizer programs involve more than two and as many as five applications per year. Phosphorus can be supplied to turf as inorganic and/or natural organic fertilizers (Table 5). Sampling directions vary from lab to lab, so follow instructions on the test kit carefully. It is more likely to occur following surface applications of urea or ammonium-containing fertilizers. Samples must be representative of the area, collected according to lab instructions, and, above all, free from soil and other contaminants. Ultimately, users will have differing expectations concerning the function and aesthetics of turfgrass areas. Urea is a synthetic organic fertilizer that contains 46 percent nitrogen. Most professional fertilizer applicators prefer high-density fertilizers because of their improved spreading characteristics. When nitrogen, phosphorus, and potassium are all present in the container, the fertilizer is called a complete fertilizer. Ammonium sulfate is a water soluble fertilizer providing 21 percent nitrogen by weight and 24 percent sulfur. Under cool, wet con- ditions, rates of 0.15 to 0.20 pound iron/1,000 square feet controlled moss mar- ginally without injury or blackening of Providence creeping bentgrass turf. They provide a longer duration of nitrogen release than the quick-release sources and are safer to use on turf because of their lower burn potential. Prepared by Peter Landschoot, Professor of Turfgrass Science. Different coating thicknesses may be used to obtain different nitrogen release rates. The number of fertilizer applications you make during the growing season is just as important as the amount and type of fertilizer you use. Ferrous sulphate is stored in the soil shortly after application by a combining with high pH elements in our native soils. This is because of the lower amounts of nutrients found in poor-quality soils and the fact that nitrogen is more easily leached from sandy soils. Although phosphorus is not readily leached from turf soils into groundwater, recent studies of phosphorus fate on cropland have shown that this nutrient can enter surface water via erosion and runoff. Penn State's Agricultural Analytical Services Lab sampling instructions suggest collecting 12 or more subsamples per location in a regular grid pattern (Figure 1). To maintain consistent soil test results and recommendations, work with one lab that is convenient to use and whose recommendations you can understand. In some cases the higher rates caused the turf to turn a blackish-green color. How much of the 26-5-10 fertilizer will you need to apply per 1000 square feet? For moss control, aim for 5g iron sulphate/m2 of turf lawn if applied as a solid product (this is equivalent to 50kg iron sulphate/ha). The most common forms of iron fertilizer for turfgrasses are inorganic iron salts and organic iron chelates (chelated iron) (Table 8). Affects rate of seedling development, maturation, and root growth. 5.0 (1) "Fast delivery" "Good service" Contact Supplier. It can be applied to lawns as a top dressing of nitrogen and sulfur with a broadcast or drop-type spreader. The urea hydrolysis process is hastened by the urease enzyme, which is abundant in soil and thatch. Slow-release nitrogen sources, also called "controlled-release," "slowly available," "slow acting," and "water insoluble," are an important part of turfgrass fertility programs. The higher cost and low efficiency have prompted many manufacturers and turf managers to mix or blend both slow- and quick-release sources. Once release begins from a given particle, it is quite rapid. A four application per year program, for example, can involve rates less than 1 pound nitrogen per 1,000 square feet per application. Nitrogen applied during late summer stimulates foliar growth, but not to the extent that occurs in spring. 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