Effects of nitrogen fertilizer and base on turf quality of creeping bentgrass

Simulated greens were established with PVC pipes filled with four base mixutre in greenhouse in order to understand effect on of fertilizer and base on creeping bentgrass turf quality. The seed was sowed in PVC pipes, which was fertilized with Hoagland and Arnon nutrient solution until the stand formed, then half of the pipes were fertilized with watersoluble fertilizer Co(NH4)2 and the other half were fertilized with controlled released fertilizer (IBDU) at the same rate. Analysis of root depth and organic matter accumulation indicated that the main effect of base mixtures and nitrogen sources were significantly different. As a result, the establishment speeds of greens with four bases ranked as sandy loam soil base fully amended sand partially amended sand pure sand. Organic matter accumulation speed showed the same trend. The surface layer quality of greens with four bases ranked as fully amended sand partially amended sand pure sand sandy loam soil base. During the turf establishment, urea could help to promote growth and establishing speed. The IBDU released N slower than urea, which adapt to the nutrient requirement of creeping bentgrass growth after establishment. In addition, IBDU was insoluble and function slowly, and should be applied together with urea when turf matured.