Effect of abscisic acid(ABA)on the quality and the yield of Leymus chinensis growing in the sown grassland

The paper dealt with the improvements of the yield and the quality of Leymus chinensis growing in the sown grassland by spraying plant growth regulators,namely abscisic acid(ABA),over it.Sprayed the grass with ABA at turning green stage,jointing stage and boot stage,respectively.The results showed: both the yield and the quality of Leymus chinensis were increased by spraying ABA of different concentrations over it compared to the control.The height and the dried weight of it sprayed with the optimal concentration of 0.01 mmol/L were increased 5.17% and 3.85%,and the contents of NDF,ADF and CP were increased 3.94%,6.15% and 16.14%.In all,spraying ABA over Leymus chinensis improved the yield and the quality of it.