In order to explore the key technical factors of sugar-free tissue culture technology of blueberry in seedling production, conventional tissue culture seedlings of ‘Emerald’ varieties were used as material. The effects of different plant growth regulators and concentrations, solid matrix and nutrient solution ratio（solid-liquid ratio） and antibacterial agents on the rooting and contamination of blueberry tissue culture seedlings were studied. In order to provide scientific basis for the further optimization of blueberry sugar-free tissue culture scheme and the production of high-quality seedlings in blueberry industry. The results showed that the improved WPM medium supplemented with 1.0 mg/L IBA or 1.0 mg/L NAA had better rooting effect on blueberry seedlings. The ratio of 1.80 L solid matrix（vermiculite） to 1.25 L nutrient solution was the best,both of which could promote the rooting of blueberry seedlings and increase the number and length of roots. The antibacterial effect of Zhipeijing was the best, which could effectively reduce the pollution rate to 13.65%.
声乐艺术是一种表演艺术,是人体发出的音调与语言相结合的产物.声乐艺术家需要运用各种声音效果和演唱技巧,如音域、音色、呼吸控制等,来实现表达情感、传达信息、创造美感的表演目的. "一切景语皆情语".声乐艺术作为人们情感抒发的直接形式,其对自然景观、百姓生活、乡村经济、文化教育等主题的描述生动而具体.声乐艺术与乡村振兴深度融合,二者相辅相成、互为助益.一方面,乡土是声乐艺术的源泉和创新土壤;另一方面,声乐艺术在乡村振兴中发挥着塑造民风民俗、培养艺术人才、催生新兴业态的重要作用.
To select the best fresh grape varieties suitable for development in the Guanzhong region of Shaanxi Province and to optimise the structure of existing fresh grape varieties in the region,new grape varieties selected by the main grape breeding units in China were introduced and tested using a combination of field observations and indoor measurements,including the phenological period,growth and fruit performance,and economic and biological traits,etc.The fruit was harvested at maturity to determine the fruit quality.Finally,the fruit quality was comprehensively evaluated using principal component analysis.The analysis concluded that'Nantaihutezao','Tiangongmoyu','Ruiduhongyu','Shenhua',and'Huangjinmi'performed well and were suitable for rain-shelter cultivation in the Guanzhong region of Shaanxi Province.
体育职业教育的核心目标是通过一系列系统性的知识传授、技能训练和实践操作,使学生深入掌握体育专业的理论知识,并具备相应的实际操作技能,从而满足体育行业的发展需求.从广义上看,体育职业教育的内容非常丰富.首先,它涵盖了体育科学理论、运动训练理论、运动修复等一系列理论教育,为学生提供了坚实的理论基础.其次,技能教育也是其重要组成部分,包括体力训练、技能训练和实践操作等,旨在提高学生的实际技能水平.再次,能力教育也是体育职业教育的重要一环,涉及项目管理、赛事组织、队伍建设、体育教学、体育宣传等,这些都是为了培养学生在实际工作中所需的各种能力.最后,职业道德、职业操守、职业素养等也是体育职业教育的重要内容,提高学生的综合素质,将为他们未来职业生涯打下坚实基础.
水果价格可以将供给方、流通方和需求方连接在一起,为市场的高效运行提供必要的信息和参考,因此对水果价格影响因素的系统性研究有着重要的理论和现实意义.基于2002-2021年季度数据,使用平稳性检验、协整性检验、BVAR模型、脉冲响应函数等多个方法研究了水果价格和影响因素间的定量关系.结果表明,影响因素中只有农业生产资料价格指数、城镇化率、鲜果消费价格指数和蔬菜生产价格指数4个变量对水果生产价格有显著影响,并按照从大到小的顺序对水果价格产生正向冲击.最终给出了相应的对策建议.
