| A field study to compare the effects of various fertilization schemes on turf quality of Kentucky bluegrass (Poa pratensis L.) was conducted in Beijing between May 2002 and November 2003.The results indicated that fast release fertilizer provided the greater initial response, while slow release fertilizer gave the better characteristics based on color ratings. Fertilization in summer sharpened the injury of brown patch disease, whereas the less injury was observed for Diammonium-phosphate treatment. In addition, the reduced tiller number was found because of the brown patch. Better uniformity was abtained with fertilization times increasing. The turf fertilized with slow-release fertilizer had a slow fluctuation of growth rate and kept a relative stable N concentration. NO3 -N concentrations in soil was mostly effected by fertilization and the NO3 -N concentrations in soils of 0-20 cm were associated with different patterns of nutrion releasing. Balanced fertilization could retard the nitration process and reduce nitrate concentrations in soil, consequently lower the likelihood of nitrate leaching. The combination of application of P fertilizer and N fertilizer is important because the long-term application of Diammonium-phosphate increase the content of available P in cultivated layer. The PH of soil decreaed with the growth of turfgrass from April to October, however, fertilization had a little effect on it.
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