[Objective] To research the effects of water retaining agent on seed germination and growth of perennial rye-grass and total soil moisture content,and to provide theoretical basis for the water-saving cultivation.[Method] Under the condition of natural light and shading condition,we compared the effects of different dosages of water retaining agents( 0,3,6,9 g / m2) on the seed germination growth and matrix waterholding capacity.[Result] Effects of water retaining agent in different substrates on enhancing ...