Study On The Demand Of Kentucky Bluegrass Turf For Fertilizer And Trinexapac-Ethyl In Growth Seasons

Using the method of randomized blocks design evaluated N,K and TE effects on the aboveground biomass,root biomass,turf color and N,P concentration in leaf and root to get a sciently and economically turf management and to be harmonized with turf.The befitting management was concluded from May to October. The conclusions wereshown as follows:1. With the increasing of N applies,the height,fresh clippings and dry clippings were all increasing. With the increasing of TE applies,they were all decreasing.The effect of K on the height and clippings was different on different stages.The lowest height,fresh clippings and dry clippings was treatment of N1K1T3(N-0kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1) or N1K2T3 (N-0kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1)from May to October.2. With the increasing of N applies,the root biomass was decreasing. With the increasing of TE applies,root biomass was increasing. With the increasing of K applies, root biomass was decreasing in May,September and October. The highest root biomasswas treatment of N1K1T3(N-0kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1) or N1K2T3(N-0kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1).3. With the increasing of N applies,the chlorophyll concentration was increasing. With the increasing of TE applies, chlorophyll concentration was increasing. The effectof K on the chlorophyll concentration was different on different stages. The highest chlorophyll concentration was treatment of N4K1T3 (N-30kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1) in June and October and treatment of N4K2T3(N-30kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1) in May,July,August and September.4.With the increasing of N applies,the N and P concentration in leaf of turfgrass were all increasing.And decreasing with the increasing of TE applies. The effect of Kwas significant on the N concentration from July to October and the P concentration in June and July. The highest N concentration was treatment of N4K1T1(N-30kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-0ml·ha^-1·10days^-1) in May,June and October and treatmentof N4K2T1(N-30kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-0ml·ha^-1·10days^-1) in July,August and September. The highest P concentration was treatment of N2K2T3(N-20kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1) in July and treatment of N4K2T1(N-30kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-0ml·ha^-1·10days^-1) in other months.5. With the increasing of N applies,the N concentration in root of turfgrass was increasing and P concentration in root of turfgrass was decreasing. With the increasingof TE applies,the N and P concentration in root of turfgrass were all increasing. The effect of K was significant on the N concentration in root in May and June and on the P concentration in June and July. The highest N concentration was treatment of N4K2T3(N-30kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1). The highest P concentration was treatment of N1K2T3(N-0kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625 ml·ha^-1·10days^-1) in May,July and October and treatment of N1K1T3(N-0kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1) in June,August and September.6. The result of comprehensive evaluation of each treatment from May to October were shown as follows: N3K2T3(N-25kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1),N4K1T3(N-30kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1),N2K2T3(N-20kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1),N4K1T3(N-30kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1),N4K2T3(N-30kg·ha^-1·month^-1,K-20kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1),N1K1T3(N-0kg·ha^-1·month^-1,K-0kg·ha^-1·month^-1,TE-625ml·ha^-1·10days^-1).