| The material in this research is 3 bluegrass cultivars, which are normally used in North of China. In the experiment, using Potassium treatment associated with field experiment and lab analysis, study the effects of drought resistance on the germination, morphological characteristics and physical and chemical characteristics. The relationship between Potassium and drought resistance of germination, seedling and adult plant were analyzed, according to the data of experiment. The suitable density of Potassium nutrition, which can be used to improve drought resistance of bluegrass, was screen out.The results shows : Using 1～3mg/ml KNO3 soaking seed can improve the germination, the effect of 4 mg/ml KNO3 is not obvious. In the simulated test, 0.2～0.6g/l K2SO4 treatment can improve the content of Chlorophyll and soluble sugar, free proline and reduce the relative osmolarity of cell membrane and the content of MDA ,the treatment of 0.4g/l K2SO4 is the best, which can improve the drought-resistance greatly, while 0.6～0.8g/l K2SO4 is not good. The result of lab and field experiment are the same tendency with these measurements, 3.3～10g/m2 K2O can increase the plant drought resistance. In this research, suitable content of Potassium can improve drought-resistance of bluegrass cultivars. Using 2mg/ml KNO3 soak seed can improve the germination of bluegrass. The management of lawn in arid area , using 6.7g/m2 Potassium nutrition can improve drought-resistance, but higher content of Potassium can decrease drought-resistance. The thickness of leaves and vigor of root is not very well under Potassium treatment. Postgraduate: liwei Speciality: Garden Plant and Ornamental HorticultureSupervisor: Prof.Chen Yajun...
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