Plant Growth Regulator Of L. Chinensis Artificial Grass Yield And Quality Effects

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), brassinolide (BR) and compound solvents, over it. We sprayed the grass with the plant growth regulators at turning green stage, jointing stage and boot stage, respectively. To evaluate the effect on the yield of Leymus chinensis, we measured the height and dried weight of the samples. To evaluate the effect on the quality of the grass, we measured the contents of neutral detergent fibre (NDF), acid detergent fibre (ADF) and crude protein (CP) of the samples. 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 0.01mmol·L-1 were increased 5.17% and 3.85%, respectively, of the control. And the contents of NDF, ADF and CP were increased 3.94%, 6.15% and 16.14%, respectively, of the control. Spraying Leymus chinensis with ABA improved the yield and the quality of it resulting from its enhanced capabilities of resisting adversity. By means of spraying BR of different concentrations over Leymus chinensis at three above-mentioned growth stages, both the yield and the quality of the grass in all the experimental groups were increased. The height and the dried weight of it sprayed with the optimal concentration of 2(10-4 mmol·L-1 were increased 6.23% and 4.61%, respectively, of the control. And the contents of NDF, ADF and CP were increased 4.52%, 9.76% and 32.75%, respectively, of the control. Spraying Leymus chinensis with BR could benefit the growth, especially at the jointing stage and the boot stage, when were considered as the optimal time to spray. In all, spraying BR over Leymus chinensis improved the yield and the quality of it. By means of spraying the ABA+BR compound solvents of different concentrations over Leymus chinensis at three above-mentioned growth stages, both the yield and the quality of the grass in all the experimental groups were greatly improved. The height and the dried weight of it sprayed with the optimal compound concentration of 0.01mmol·L-1 ABA + 2(10-4 BR mmol·L-1 were increased 7.52% and 12.28%, respectively, of the control. And the contents of NDF, ADF and CP were increased 5.67%, 10.48% and 42.43%, respectively, of the control. The efficacy of compound solvents on the improvements of the yield and the quality of Leymus chinensis greatly exceeded that of a single growth regulator because the compound solvents had cooperating and magnifying functions. This paper combined the hormonal regulations (chemical controls) on plant growth with the conventional pastoral measurements so as to exert the potentialities of the sown grassland, improve the yield and ameliorate the quality of Leymus chinensis grassland to much more extent, which supplied the scientific basis of widely applying plant growth regulators on the sown grassland of Leymus chinensis.