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 a pplications on 'Baron' Kentucky bluegrass (Poa pratensis L.) turf qual ity, chlorophyll content, soil test levels of P and K, and foliar nutr ient 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 i ncreased available soil P and reduced available soil K and Cu concentr ation in clippings.