| This experiment used the method of field experiments and laboratory analysis combining in the 2005-2006 in Kazakh national township of ChangJi of XinJiang .Studies on nitrogen fertilizer, density, the cutting height.which affected on yield, forage nutrition quality of straw stalk and certain physiological characteristics of maize. .Main conclusions are as follows:1. Increased adequate nitrogen at the jointing stage.It promoted the leaf area to expand and increase leaf area index and duration and dry matter accumulation,then large scale enhance the yield of the straw stalk and the grain,obviously improves forage nutrition quality of the straw.Applying adequate pure nitrogen300～375kg/ha(jointing stage 150～225 kg/ha).2 The density of 4.50×10~4-7.50×10~4 plant/ha, with the density increasing, yield increased firstly then decreased , forage quality and nutrition show a downward trend.The density of the highest yield and good quality was inconsistent, Considing yield and quality. the density of 6.00×10~4-6.75×10~4plant/ha was adequate.3 With the cutting height raising from first to eighth ,forage nutrition quality of straw stalk obviously improved.Considing yield and quality,from the fourth harvest compared the first harvest,the crude protein content of straw stalk of nongda108 and keduo4 was separately increased percent of 7.5 and 5.8.NDF,ADF and ADL have different degree droped.The yield of nongda108 and keduo4 was percent of 75 and 76 of the first harvest.4 At the area of settlement of herdsment,nongda108 used technology which applied 375-450kg/ha nitrogen.and density is 6.0×10~4-6.75×10~4plant/ha.from first to fourth,obviously enhance yield ,quality and benefit.5. Nongda108 and xinduo2 straw stalk quality surpassed Sc704.Because it has physiological characteristics of the high leaf area index and the long function period, strong nitrate reductase activity, many secondary root, root activity high. |
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