Effect Of Different Nitrogen Rate, Stubble Height And Mowing Period On Performance On Bromus Inermis Leyss

From September 2006 to October 2007,a nitrogenous fertilizer,mowing and stubble experiment about Canadian Smooth Brome was conduct in the Jilin Academy of Agricultural Sciences turf.a different application of nitrogen fertilizer,mowing and stubble height of the period Canada Smooth Brome Growth Properties,grass yield,seed yield and nutrient content of the impact of research results indicate that:With the mowing period of delay,Bromus inermis by the Health have delayed the process, mowing the jointing stage with the heading stage,early flowering and seed maturity than control 10 to 20d postponed.Bromus inermis plant height in a certain range with the amount of nitrogen increased,the overall trend is clearly changing.Jointing stage of the processing plant height did not change significantly,A1 heading deal with a difference of 8.19 cm and A4,A4 flowering period difference between A1 and 12.7 cm,A1 and A4 maturity difference 7.44 cm,height of the reproductive period of the overall change of the A4>A3>A2>A1.Smooth Brome growth process is "s" curve,the mathematical model is:y=1.8/(1+24 * exp(-0.05 * x)).Nitrate reductase activity(NRA) and the amount of nitrogen application within a certain range in a positive correlation,nitrogen plant leaves can significantly enhance the activity of nitrate reductase,the enzyme activity based on the sort of level A4>A3>A2>A1.Reproductive phase of the NRA for the overall performance of the activity from the heading,the NRA continuously improve the value of the peak flowering period,and then gradually decreased.Nitrogenous fertilizer can increase the nitrate content of the plant,with the increase of nitrate nitrogen content changes significantly.210 kg/hm~2 to fertilization treatment nitrate reductase activity highest,1823.63 mg/Kg.Nitrate content with the continuity in the process of fertility reduction in the maturity to a minimumFertilization significantly increased Bromus inermis straw yield,fertilization of the 210 kg/hm~2 fresh hay and the highest yield,respectively 31595.45 kg and 9525.17 kg.Stubble height and yield of grass-related,the higher the grass stubble and the lower yield.Effects of different periods of different cutting production to mowing the flowering stage fresh yield the highest, 28649.14 kg,the maturity mowing hay yield the highest,10136.5 kgBy orthogonal test analysis and comparison of single factor and the difference between the level of interaction between the effects of the Yield determine the optimal combination to obtain maximum yield fresh for the purpose of optimal model A4B1C3 to obtain the highest yield for the purpose of hay The optimal model for A3B1C4.A range of application of nitrogen fertilizer can increase Smooth Brome seed yield and yield components factor in the fertilization of 210 kg/hm~2 conditions,the highest seed yield for 1731kg/hm~2.Fertilization has markedly enhanced the Smooth Brome protein production,and merit selection of protein production factors to determine the optimal combination of protein production for A3B2C1.Pickling A3B1C4 to deal with the highest fiber harvest,kg/hm~2 to 3850.47.Soluble sugar content and starch content in the highest maturity,soluble amino acid content with the constantly increasing volume of nitrogen fertilizer increased.