Study On Spatial And Temporal Heterogeneity Of Alfalfa Hay Making And Storing Technology

In order to solve the problem of alfalfa hay making in two alfalfa main productionareas of Northwest and Huang-Huai-Hai in China, explored the harvest timely technology,optimized hay making technology and safety bale storage technology of alfalfa thoughthe research of this paper for two areas, aimed to provide theoretical basis and technicalsupport for the excellent quality alfalfa hay production of our country. In this paper, itwas taken Yinchuan and Qingdao as experimental sites, and "Golden Empress" alfalfa asexperimental raw material, studied the technology and mechanism of harvest, hay makingand bale storage of alfalfa systematically through plot experiment and field experiment,and tested by in vitro digestion experiment. Based on the comprehensive analysis andevaluation of the experimental results, obtained the following conclusions:(1) Considering the effects of different cutting periods, stubble height and cuttingtimes on alfalfa yield, nutrients and root before winter, thought that the suitable cuttingstubble height of alfalfa is5~6cm and the last harvest is7~8cm; the appropriate cuttingperiod of alfalfa in the northern plains areas of Ningxia is the initial flowering stage, itcan cutting4times; the appropriate cutting period of alfalfa in Qingdao is between thesquaring stage and the initial flowering stage, it can cutting5times.(2) Considering the effect of different drying treatments on drying rate, leaf loss rateand nutrients loss rate of alfalfa, thought that the tests of "Moderately fracturing+Turnover drying once+Natural drying" and "Moderately fracturing+Baling moisture of40%+Wisp drying" respectively is the best test in the northern plains areas and southernmountain areas of Ningxia, and the test of "Moderately fracturing+Turn over dryingonce+Plastic shed drying" is the best test in Qingdao areas.(3) Considering the effects of baling conditions on the sensory characteristics, baletemperature, mold amount, nutrient content and in vitro digestibility of alfalfa, thoughtthat baling in moisture of28%~30%to100kg/m3bale with addition of2%CaO can playa good mildewproof effect after storage, the alfalfa bale nutrition could preserved betterand the degradation rate was higher than others.(4) Synthesized all the experimental results and got the measures of harvest timely,optimized hay making and safety bale storage for alfalfa. It was that cutting in initialflowering stage, stubble height is5~6cm, moderately fracturing and turn over once of natural drying in Yinchuan area or plastic shed drying in Qingdao area, baling into100kg/m3bale with addition of2%CaO when the water content reached to28%~30%, itcould obtain high quality hay. Use this method to harvest and making alfalfa hay, when itwas storaged after360days, The hay CP content in Yinchuan could still be reached to15.19%, the TDN and RFV were50.27%and101.68respectively, DM degradation ratewas66.24%. The hay CP content in Qingdao could reach to15.12%, the TDN and RFVwere50.19%and101.32respectively, DM degradation rate was66.83%.