广西第八周期春大豆区试报告   总被引：3，自引：0，他引：3  

陈渊  梁江  韦清源  覃德斌 《大豆科技》2006,(6):27-29,33

广西第八周期春大豆区试结果表明：桂816、桂807、柳99—22和桂980725等四个品种的综合性状优于对照种桂春1号，分别增产10．2％、1．7％、1．5％和1．4％。可供广西各地引种试种示范和推产。  相似文献   

进口大豆粉碎细度对索氏抽提法测粗脂肪含量的影响     

张愉佳  张伟  佟庆龙 《粮食储藏》2017,(1):52-53

以进口大豆为研究对象,采用高效粉碎机和脂肪测定仪进行粉碎和抽提,研究其粉碎细度对索氏抽提法测粗脂肪含量的影响。结果表明,大豆粉碎细度越小,其粗脂肪含量测得越高。  相似文献   

小型大豆联合收获机开发前景   总被引：1，自引：0，他引：1  

窦吉军  王双利  黄显库  郭忠奎 《农机化研究》2003,(2):35-36

从分析黑龙江省小型大豆收割机开发现状入手，阐述了当前小型大豆收获机开发中存在的问题，分析了小型大豆收获机械化的发展前景。  相似文献   

Use of ammonia electrode for total nitrogen determination in plants     

《Communications in Soil Science and Plant Analysis》2012,43(5):477-481

Abstract

An ammonia electrode was evaluated as a means of determining ammonium concentration in semi‐micro Kjeldahl digests of plant samples. Results of the ammonia electrode determination agreed closely with distillation and titration results. Advantages of the electrode method include speed, precision, increased safety, simplicity and the fact that only a small aliquot of the digest is used.  相似文献   

切轴流式双滚筒大豆种子脱粒机设计与试验   总被引：3，自引：0，他引：3  

杨德旭  姜德龙  沈永哲  高连兴  万丽  王京 《农业机械学报》2017,48(9):102-110

为解决大豆种子脱粒损伤率高和脱净率低的矛盾,提出了钉齿式副滚筒切流预脱、弓齿与钉齿相间组合排列的主滚筒轴流脱粒、切轴流式双滚筒组合脱粒方案,进行了脱粒关键部件结构与参数设计,采用直径较小而短的副滚筒完成大豆植株的打击、抓取和拖带等切流预脱,主脱粒滚筒与副滚筒同向等速且轴向长度和直径均较大,由弓齿与钉齿组合而成,进行大豆的轴流脱粒;设计了样机并进行了脱粒性能试验。采用二次回归正交旋转中心组合优化试验方法,分别建立大豆脱粒损伤率、未脱净率与喂入量、主滚筒转速和主滚筒脱粒间隙关系的回归数学模型,利用Design-Expert 8.0软件对该模型进行优化求解得到最佳参数组合,试验结果表明:在大豆籽粒含水率为17%~19%、秸秆含水率为12%~15%、大豆草谷比1.275条件下,当喂入量为0.44 kg/s、主滚筒转速为489 r/min、主滚筒脱粒间隙为25.06 mm时,大豆脱粒损伤率为1.18%、未脱净率为0.65%;与传统大豆脱粒机相比可使脱粒损伤率和未脱净率分别降低0.22个百分点和0.38个百分点。  相似文献   

南方春大豆不同播季主要农艺性状的变化及其遗传研究   总被引：4，自引：0，他引：4  

马继凤  赵政文 《大豆科学》1998,17(4):331-339

本文以１２个南方春大豆早熟品种（系）和１２个中熟品种（系）为材料，进行春，秋播试验，研究主要农艺性状的秋播变异率，遗传变异系数，遗传力和遗传进度，结果表明：１，两熟期组秋播变异率平均，除分枝起点为负值以外，其它１１个性状在２．３６％－５２．８８％之间，说明秋播对为结性状均有一定影响；熟期组之间各性状秋播变异率的大小亦存在较大差异，如秋播对早熟组株高，主茎节数，结荚节数，结荚高度，主茎荚数和百粒重的  相似文献   

Resource patch array use by two squirrel species in an agricultural landscape     

Fisher  Jason T.  Merriam  Gray 《Landscape Ecology》2000,15(4):333-338

Eastern grey squirrels (Sciurus carolinensis) and North American red squirrels (Tamiasciurus hudsonicus) were studied among wooded patches within an agricultural mosaic. Fifteen sites south of Ottawa, Canada, with differing landscape and local features were censused using tracking boards placed in a woods or wooded fencerow. Regression analyses of landscape compositional and physiognomic variables within a 1-km radius isolated the best predictors of grey and red squirrel abundance and activity. Grey squirrels were found in both small woods and fencerows in farm landscapes but were not found in large woods. A polynomial regression of wooded patch size explained 79% of the variance in grey squirrel abundance. Grey squirrel activity was correlated with the percent cover of soybeans in the landscape. Red squirrels were found in fencerows, small and large woods; activity was correlated with the percent cover of both woods and corn crop in the surrounding landscape. These results indicate that distributions of both species are influenced by multiple landscape elements, but that grey squirrels may rely on fragmented agricultural landscapes whereas red squirrels make more use of both native woodland and altered landscapes.  相似文献   

工业型城乡交错区土壤重金属含量及其空间分异的特征-以无锡典型城乡交错区为例   总被引：6，自引：0，他引：6  

ZHAO Yan-Feng  SHI Xue-Zheng  HUANG Biao  YU Dong-Sheng  WANG Hong-Jie  SUN Wei-Xi  I. &#;BOERN  K. BLOMB&#;CK 《土壤圈》2007,17(1):44-51

Phosphorus （P） is necessary for growth and nitrogen fixation, and thus its deficiency is a major factor limiting legume production in most agricultural soils. The effect of phosphorus supply on nodule development and its role in soybeans （Glycine max L.） was studied in a nutrient solution. Plants were inoculated with Bradyrhizobium japonicum and grown for 35 days in a glasshouse at a day and night temperature of 25℃ and 15℃, respectively. Although increasing P supply increased the concentrations of P and N in the shoots and roots, the external P supply did not significantly affect the P concentration in the nodules, and the N fixed per unit nodule biomass decreased with increasing P supply. The nitrogen content in the shoots correlated well with the P content （r=0.92＊＊）. At an inoculation level of 10^2 cells mL^-1, the P supply did not affect the number of nodules; however, at inoculation levels of 10^3.5 and 10^5 cells mL^-1, increasing P supply increased both the number and size of nodules. Irrespective of the inoculation level, increasing P supply increased the nodule biomass relative to the biomass of the host plant. It is suggested that the P deficiency specifically inhibited the nodule development and thereby the total N2 fixation.  相似文献   

中国转基因大豆进口及其影响分析   总被引：1，自引：0，他引：1  

吴曰程  王玉斌 《大豆科学》2019,38(4):635-643

为明晰转基因大豆进口对中国的大豆产业、国际贸易地位以及转基因发展的影响,进而为壮大国内大豆产业,稳定国内大豆市场秩序,促进国内转基因技术有序发展提供相关依据,利用文献综述方法并结合分析相关统计数据,对我国转基因大豆进口增加的现状与原因进行了阐述。研究认为,转基因大豆进口严重弱化了中国在国际大豆贸易中的话语权,不利于中国的大豆甚至粮食安全以及国产大豆的发展;国际资本伴随大豆进口入侵中国大豆加工产业,同时刺激内资企业的兴起;转基因大豆进口对种质资源、生态坏境存在潜在压力,但又促进国内转基因技术的发展以及转基因监管体系的完善。鉴于此,提出提高国产大豆的市场价值与比较收益,降低国内对国际大豆的依赖度,以需求拉动国产大豆供给,以及在风险可控的情况下加快国内转基因技术研究及监管体系建设的对策建议。  相似文献   

栽培大豆品种间RAPD标记的多态性分析及聚类分析   总被引：8，自引：2，他引：6  

张志永  陈受宜 《大豆科学》1998,17(1):1-9

应用从６０００多份大豆种质资源中筛选的２１个抗大豆花叶病毒病的品种或品系及７个感病的品种或品素,选用２０个随机引物,对总ＤＮＡ进行了随机扩增。有１８个引物扩增得得到了稳定的ＲＡＰＤ图谱。ＯＰＨ－０６和ＯＰＨ－１０未能扩增到ＲＡＰＤ产物。  相似文献