HIGH PHOSPHORUS APPLICATIONS INFLUENCE SOIL-AVAILABLE POTASSIUM AND KENTUCKY BLUEGRASS COPPER CONTENT

The objectives of this study were to determine the effects of high P applications on 'Baron' Kentucky bluegrass (Poa pratensis L.) turf quality, chlorophyll content, soil test levels of P and K, and foliar nutrient concentration. In this 5-year field study, P was applied at 0, 22, 43, 86, 172, or 258 kg.ha-1.year-1 using triple superphosphate (210 g P/kg) in single applications in May. Phosphorus applications did not affect overall yearly quality, chlorophyll content, or soil pH, but increased available soil P and reduced available soil K and Cu concentration in clippings.