Study On Influence Of Using Plant Growth Retardant For Three Species Of Cold-seasonal Grass

Abstract In order to improve the quality of lawn and lower management costs of its, a lot of research in chemistry trim has been made by many countries which are advance in using of the lawn, and have got some gains. Our country faces the pressure of management with rising of lawn trade. Therefore, shortening the lawn and taking on medicine trim with plant growth retardant have significant practical meaning for lowering the costs and raising economic benefits. Two kinds of new plant growth retardant (Paclobutrazol and Uniconazol) are used in this experiment. Restraining the production of GA and controlling the cell growth of node are their main biochemical function, which play an important role in retarding the growth, lessening the frequency of trim and reducing the management costs. The morphology effect will strengthen with the increase amount of plant growth retardant in per area of a limited range. Different biological effects are produced by the influence of inner hormone. Three different concentration gradients of each kind chemical are used in these there common cold-seasonal lawn plants which are Poa pratensis ,Festuca rubra and Agrosis stolonifera respectively in this experiment. The comparison of height, biomass, sugar content, chloroplast and permeability of cell membrane in high and low temperature are taken. With the reference of the results mentioned above and the help of the measured plant growth during the whole growing season, the result of this conclusion is that Paclobutrazol (lOOmg/m2)is proper chemical for Poa pratensis, Paclobutrazol (200mg/rn2) for Festuca rubra, and Uniconazol (30mg/rn2) for Agrosis stolon~fera.