阔叶树容器育苗关键技术研究

以容器育苗为研究方向,以乳源木莲、深山含笑、大叶樟、猴欢喜等阔叶树种为试验材料,开展了育苗轻型基质、育苗容器规格、阔叶树容器苗出圃质量评价等方面的研究。结果表明:轻型基质J16最有利于苗木根系生长,其根量最大,苗高生长最快。容器规格在育苗初期对苗木生长影响不大,但随着苗木的逐渐生长,不同规格容器的苗木各指标差异增大。从容器苗各形态指标间的相关性、生理指标及活力指标等方面分析,构建以外观特征、地径、苗高、高径比、>2 cm长Ⅰ级侧根数、全苗干重、根系水势、根生长潜力(RGP)为阔叶树容器苗质量指标的综合评价体系,提出了大叶樟等3个阔叶树种容器苗的出圃质量标准。     

设施甜瓜基质营养土隔地栽培技术

针对设施栽培中常发生的土壤酸化、返盐和土传病虫害等连作障碍问题 ,探讨和总结了甜瓜基质营养土隔地栽培的新型种植方法。它结合了无土栽培和土壤栽培的优点 ,采用基质与园土的混合物作为栽培介质 ,用塑料薄膜将根系与外界隔离 ,采用滴灌技术供应肥水 ,成本低、管理简单 ,可有效控制甜瓜糖度和品质 ,较好地解决了连作障碍等问题。甜瓜产量可达 45t/hm2 。     

LIF与心肌条件液在小鼠ES细胞分离中的差异比较

通过比较LIF和大鼠心肌条件液在小鼠ES细胞分离培养过程中的差异,从而选择较为合适的培养液用于小鼠ES细胞的分离培养与深入研究.取怀孕3.5 d小鼠囊胚,培养于小鼠胎儿成纤维细胞饲养层上,然后根据ES细胞培养液的不同分成2组,一组添加LIF的ES细胞培养液,另一组添加由大鼠心肌条件液组成的ES细胞培养液.结果显示,小鼠ICM的孵出率在心肌条件液中为76.30%,LIF条件液中为59.35%,两者差异极显著(p＜0.01);在LIF条件液中比心肌条件液中能较早地分离出ICM,时间差分别为11、11、12、10和12 h,平均为11.2 h;对传代的ES细胞集落,培养48 h时周边出现分化现象的ES细胞集落所占的比例在心肌条件液中为51.55%,LIF条件液中为31.69%,两者差异显著(p＜0.05),第五代小鼠ES细胞核型正常率在心肌细胞条件液中为78.6%,稍高于LIF条件液中的76%,差异不显著.     

EFFECT OF PEAT-REDUCED AND PEAT-FREE SUBSTRATES ON ROSEMARY GROWTH

The objective of this work was to study the use of four composts, obtained by agro-industrial, urban and green wastes, as growing media components on Rosmarinus officinalis L. Substrates were obtained by mixing each compost with peat in different proportions. Main physical and chemical characteristics of prepared substrates have been compared and, at the end of growing cycle, the biometric survey on main growing parameters and plant nutritional status was performed. The obtained results showed that substrates with 30% compost have main physical and chemical parameters comparable with those of the control. Best quality plants have been obtained substituting peat with 30% of compost, except with the olive mill compost. At the end, the green pruning compost can be recommended as growing media component (up to 50%) for the growth of Rosmarinus officinalis L., being able to determine high quality plants, together with an implemented plant nutrient efficiency.     

Effect of 2(N‐morpholino)ethane)sulfonic acid (MES) on the growth and tissue composition of cucumber

The effect of 2(N‐morpholino)ethane)sulfonic acid (MES) on the growth of cucumber (Cucumis sativa L. var. Marketer) in hydroponic culture was determined at 0, 1, 5, and 10 mM concentrations. The effect of adding the MES to the solution at the time of transfer to hydroponic culture or waiting one week was also determined. MES was observed to strongly affect plant growth with increasing concentration in nutrient solution. Tissue and nutrient solution analysis determined that MES affects manganese (Mn) uptake. MES appears to be reduced by Mn, precipitating the Mn out of solution. The suitability of MES as a pH buffer in hydroponic culture is discussed in terms of this effect.     

新媒体环境下图书馆书刊采购机制研究

高校图书馆藏书质量的好坏与教学、科研工作有着密切的关系。要提高图书馆藏书质量,则必须建立一个良好的采购体系。将从新媒体环境下图书馆书刊采购机制的现状、建立采购机制的必要性进行分析,探讨高校图书馆图书采购机制中的存在问题与措施。     

Entertainment-Education Strategy Utilization for Agricultural Information Dissemination: Congruency Among Researchers,Extension Agents,and Farmers in Southwestern Nigeria

Several congruency studies exist on agricultural-related issues, but studies on congruency for entertainment-education (EE) utilization for agricultural information dissemination is limited. Congruency among researchers, extension agents, and farmers on the use of EE for agricultural information dissemination was examined. A multistage sampling procedure was used to select 161 respondents across respondent categories. A structured questionnaire was used to obtain data on respondents' perception and estimate of perception of other stakeholders to establish accuracy. Data were analyzed using Pearson product-moment correlation at p = 0.05. Results indicate congruence between researchers' perception and accuracy in establishing extension agents and farmers' opinion about media environment. A similar result was obtained for congruence between farmers' perception and other stakeholders' position on media environment. Congruence between extension agents, researchers, and farmers was accurate for infrastructural factors. Given the accurate predictions of each other's disposition to key variables, EE should be further exploited for agricultural information dissemination.     

Co-Orientation in Gender Preferences for Mass Media Usage Among Benue Farmers

This study examined the extent of agreement between male and female farmers’ usage of mass media. Data collected from 250 farmers in Benue, Nigeria using a structured questionnaire showed that 79.6% could read and write and revealed a disparity in the use of television, mobile phones, the Internet, and newspapers. The Mann-Whitney U test showed significant differences in the use of television (.013), the Internet (.044), and newspapers (.082), indicating non-alignment positions. Alignment in the nonuse of production guides and journals/magazines (dmr = 0) and near alignment for radio (dmr = 1) was observed. We recommend that stakeholders in the agricultural delivery system make use of mass media that are gender-relevant in disseminating farm messages.     

Tracking public interest and perceptions about smalltooth sawfish conservation in the USA using Instagram

1. The population of smalltooth sawfish (Pristis pectinata) in the USA was listed as endangered under the US Endangered Species Act in 2003. Based on objectives identified in the Smalltooth Sawfish Recovery Plan, an interdisciplinary team developed a variety of outreach efforts and products to educate the public and promote sawfish conservation. These include safe viewing, handling, release, and reporting guidelines for boaters, divers, and anglers that may interact with the species.
2. The usefulness of monitoring social media to track public interest and perceptions of smalltooth sawfish was investigated via Instagram posts mentioning sawfish encounters in the USA. We aimed to identify how current outreach efforts and messaging can be improved and expanded to better inform the public and promote positive change in their behaviour to further protect smalltooth sawfish.
3. All encounters occurred in Florida waters and the trend of sawfish-related Instagram posts increased congruently with traditionally reported sawfish encounters from 2012 to 2019. The number of Instagram users who indicated that they reported their encounter or that any sawfish encounter should be reported has increased, suggesting outreach efforts have gained traction and that some members of the public are actively promoting sawfish conservation through encounter reporting. The overall tone, and thereby public perception of and attitude towards sawfish, was largely positive.
4. Though social media can be used to guide outreach initiatives and provides a platform for researchers to engage large public audiences, future research efforts should include electronic surveys within the recreational, commercial, diving, and angling communities. Additionally, social media posts should be compared with traditionally reported encounters, and media professionals working with scientists should focus on increasing the utility of social media as a way to collect encounter reports and create engaging educational content to be included with continued outreach efforts throughout the south-eastern USA.