果品分级技术研究的现状及展望

通过有效的检测,及时解决虫害或机械造成的损伤,从而减轻果品之间病虫害的传播,同时还需要对残次品进行处一定理,以确保成本的有效降低,达到全面提高我国果品的品质,增加国际市场的竞争力。基于此,本文主要讨论了果品分级技术的落实现状以及发展情况。     

保定市蚕姑坨景区农家乐发展现状研究

以河北省保定市蚕姑坨旅游景区农家乐为研究对象,对其发展规模、经营现状、消费者结构特征及发展中存在的问题进行了调查研究,研究表明,蚕姑坨景区农家乐发展已具一定规模,消费者满意度较高,但农家乐在环境卫生、服务设施、服务质量等方面还存在一定不足,在今后的发展中,应继续完善基础设施建设,增加特色服务项目,提高从业人员综合素质,加强卫生管理,优化、美化周边地区环境,走有特色的可持续发展道路。     

农产品质量安全监管体系建设现状及对策--以贵州省毕节市为例

结合毕节市农产品质量安全监管工作现状,针对监管工作中存在的农产品质量检验检测体系不完善等问题,提出建立完善农产品质量安全监管体系,将农产品质量安全监测、监管、执法经费纳入本级财政预算,建立完善农业投入品监管体系,建立并完善农产品产地准出制度和市场准入制度,加强监管、检测队伍建设,建立农产品质量安全应急预警机制,加大执法力度、构筑打击高压态势的建议,以期为相关研究提供借鉴。     

Marine-Derived Chitosan Nanoparticles Improved the Intestinal Histo-Morphometrical Features in Association with the Health and Immune Response of Grey Mullet (Liza ramada)

Marine-derived substances are known for their beneficial influences on aquatic animals’ performances and are recommended to improve intestinal health, immunity, and anti-oxidative status. The present study investigates the role of chitosan nanoparticles on the intestinal histo-morphometrical features in association with the health and immune response of Grey Mullet (Liza ramada). Chitosan nanoparticles are included in the diets at 0, 0.5, 1, and 2 g/kg and introduced to fish in a successive feeding trial for eight weeks. The final body weight (FBW), weight gain (WG), and specific growth rate (SGR) parameters are significantly increased while feed conversion ratio (FCR) decreases by chitosan nanoparticles compared to the control (p < 0.05). The morphometric analysis of the intestines reveals a significant improvement in villus height, villus width, and the number of goblet cells in chitosan-treated groups in a dose-dependent manner. Additionally, there is a positive correlation between the thickness of the enterocyte brush border and the chitosan dose, referring to an increasing absorptive activity. Histologically, the intestinal wall of Grey Mullet consists of four layers; mucosa, sub-mucosa, tunica muscularis (muscular layers), and serosa. The histological examination of the L. ramada intestine shows a normal histo-morphology. The epithelial layer of intestinal mucosa is thrown into elongated finger-like projections, the intestinal villi. The values of hemoglobin, hematocrit, red blood cells (RBCs), total protein (TP), albumin, and globulin are significantly increased in fish fed 1, and 2 g/kg of chitosan nanoparticles compared to fish fed 0 and 0.5 g/kg (p < 0.05). The highest levels of TP and albumin are observed in fish fed 1 g/kg diet (p < 0.05). The lysozyme activity and phagocytic index are significantly enhanced by feeding chitosan nanoparticles at 0.5, 1, and 2 g/kg, whereas the phagocytic activity is improved in fish fed 1 and 2 g/kg (p < 0.05). The highest lysozyme activity and phagocytic index are observed in fish fed 1 g/kg. SOD is significantly activated by feeding chitosan nanoparticles at 1 g/kg. Simultaneously, glutathione peroxidase (GPx) and catalase (CAT) activities also are enhanced by feeding chitosan at 1 and 2 g/kg, compared to fish fed 0 and 0.5 g/kg (p < 0.05). The highest GPx and CAT activities are observed in fish fed 1 g/kg (p < 0.05). Conversely, the malondialdehyde (MDA) levels are decreased by feeding chitosan at 1 and 2 g/kg, with the lowest being in fish fed 1 g/kg (p < 0.05). To summarize, the results elucidate that L. ramada fed dietary chitosan nanoparticles have a marked growth rate, immune response, and anti-oxidative response. These improvements are attributed to the potential role of chitosan nanoparticles in enhancing intestinal histo-morphometry and intestinal health. These results soundly support the possibility of using chitosan nanoparticles at 1–2 g/kg as a feasible functional supplement for aquatic animals.     

达州市经济作物产业发展现状与对策

通过分析达州市经济作物产业发展现状和存在的问题,提出了促进当地经济作物产业发展的对策建议,为推动地区特色经济作物产业高质量发展提供参考。     

生态林业建设的现状与策略分析

分析生态林业建设的现状和存在的问题,就如何以提高生态林业建设水平为抓手,促进生态林业建设的完善提出建议。     

玉米杂交种“棒三叶”光合性状的灰色关联度分析

应用灰色关联度分析方法,对玉米杂交种“棒三叶”光合性状间的相关性进行了分析。结果表明：与玉米杂交种“棒三叶”光合速率最为相关的性状是叶长,其后依次是长宽比、叶向值、叶面积、叶片干重、叶绿素含量、叶厚、比叶重、叶宽。玉米杂交种“棒三叶”光合性状间具有复杂的相互关系。     

河北省农民创业现状及对策研究

农民作为中国人数最多的一个群体,农民创业对于繁荣农村经济发展、构建和谐社会具有重要作用。文章通过对河北省农民创业意愿、创业素质、创业资本、创业规模、创业服务及创业政策等现状进行了调研分析,并从提高创业培训、拓宽融资渠道、畅通创业信息、营造良好氛围等方面提出了建议对策。     

海南省无公害农产品生产基地建设现状及对策

论述了海南省无公害农产品生产基地建设现状,分析目前存在的问题,并提出建设对策,以供借鉴。     

灰色多维综合隶属度评估方法在国家大豆区试品种评价中的应用

用灰色多维综合隶属度评估方法对参加2011年国家黄淮海夏大豆区域试验德州试验点l5个大豆新品种(系)的11个性状进行综合评价分析,结果表明:中黄46(品系)、中黄45(品系)、冀09B2(品系)为优良品系,晋遗55(品系)、冀09B5(品系)、冀豆12(CK)、鲁97013-1(品系)、中作06-875(品系)、中作J8023(品系)、中作05-6171(品系)为较好品系,晋豆40(品系)、K06-47(品系)、邯6192(品系)、中作07-22(品系)表现一般,晋大78(品系)表现较差。评价结果与品种实际性状表现吻合,说明采用此方法能比较客观、科学、合理地综合评价新品种(系)。