June 2017

SportsTurf provides current, practical and technical content on issues relevant to sports turf managers, including facilities managers. Most readers are athletic field managers from the professional level through parks and recreation, universities.

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12 SportsTurf | June 2017 FIELD SCIENCE performed. This report notes that the soil is low in P (16 lbs/A), low in K (43 lbs/A), and sufficient in Ca (199 lbs/A), Mg (40 lbs/A), Zn (1.5 lbs/A), Cu (10 lbs/A), Fe (10 lbs/A) and Mn (2 lbs/A). The soil also contains 0.2 pounds of B per acre and 10 pounds of sodium (Na) per acre. Bermudagrass nitrogen requirement. When fully established, bermudagrass usually requires from 0.5 to 1.0 or more pounds of N per 1,000 sq. ft. per growing month depending on weather, soil and the amounts of sand, silt, clay and organic matter in the rootzone. During bermudagrass grow in, the most effective N fertility programs have flexibility built in. For best results, both readily available, highly water-soluble N (WSN) sources and controlled-release N sources may be applied. Highly water-soluble N. These sources are less expensive per pound of N compared to controlled-release N sources, and stimulate rapid aerial shoot growth and field coverage. Water- soluble N sources, often referred to as agricultural-grade fertilizers are more likely to cause foliar 'burn' and leach from the bermudagrass rootzone. To limit the potential for fertilizer burn, no more than 1 lb. of WSN should be applied per 1,000 sq. ft. per application. Urea (46-0-0), ammonium sulfate (21-0-0 w/ 24 % S), diammonium phosphate (18-46-0), monammonium phosphate (11-48-0) and potassium nitrate (13-0-44) are WSN sources. Ammonium sulfate, monammonium phosphate, diammonium phosphate Soil pH affects nutrient availability. Above: July 11. Below: July 25.

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