甘肃省农业科学院网站数据迁移重建实践与特点

引入了网站群管理理念,基于LA(N)MP的Web平台,改版了甘肃省农业科学院门户网站和所属各研究所、试验站、开发实体子站和各处室网页,整合了各地州市农业科学院(所)网站,实现了统一智能化管理、数据迁移、网站重建和集中存储。重建后的网站可靠、实用、安全、扩展性强,大大推进了甘肃省农业科技信息化建设进程。     

农业信息网站的构建与实现

农业网站的建设有其自身的特殊性。针对农业网站建设的现状和实际应用需求,结合在网站建设方面的经验,从网站策划、功能结构、建设流程等方面对农业信息网站建设进行了探讨。     

第三届土壤污染与修复国际会议通知

由中国科学院主办,中国科学院南京土壤研究所、土壤与农业可持续发展国家重点实验室及国家重点基础研究发展项目(973-2002CB410800)办公室承办,荷兰土壤合作组织、荷兰瓦赫宁根大学Alterra研究所、英国洛桑研究所及香港浸会大学协办的”第三届土壤污染与修复国际会议(SoilRem2008)”将于2008年10月18~21日在南京国际会议中心举行。本届会议旨在讨论土壤污染风险评估以及污染土壤修复的科学、技术与管理新问题,会议有关信息及注册、提交摘要/全文等相关事宜可登录会议网站:http://159.226.104.139/home/indexFrameset.asp?id=2。会议主席     

网站制作流程与设计技巧

本文首先将网站建构的基本流程概括为五个阶段,并分别对其进行了介绍。然后从网站的整体风格、色彩搭配和布局规划角度出发,阐述了网站设计涉及的一些技巧。     

南京农业大学一项研究表明施肥不当会加剧温室效应

这个关于“长期施肥对水稻土温室气体排放影响”的研究成果，是在国家自然科学基金资助下，由南京农大农业资源与生态环境研究所潘根兴教授及其研究生完成的，相关论文最近发表在SCI源期刊《农业、生态系与环境》上，《自然中国》网站为此作了专门介绍。     

第五届植物技术国际会议通知

由国际植物技术协会主办,中国科学院南京土壤研究所、土壤与农业可持续发展国家重点实验室承办的“第五届植物技术国际会议(Phytotech 2008)”将于2008年10月22~25日在南京国际会议中心举行。本届会议旨在讨论植物修复污染环境的科学理论及实际应用,会议有关信息及注册、提交摘要/全文等相关事宜可登录会议网站:http://159.226.104.139/home/indexFrameset.asp?id=1。会议主席:骆永明研究员会议秘书:宋静副研究员通信地址:南京市北京东路71号中国科学院南京土壤研究所,邮编:210008联系电话:025-86881101(骆永明)、86881130     

欢迎订阅2015年《植物营养与肥料学报》

<正>本刊为中国植物营养与肥料学会主办,由中国农业科学院农业资源与农业区划研究所承办的植物营养与肥料学科的专业性学术期刊。属中国科技核心期刊、中文核心期刊、农业核心期刊;为科技部"中国科技论文统计源期刊";近年的影响因子在农学学科排名位居前列,荣获"2007年中国百种杰出学术期刊",2008年和2011年连续两届获"中国精品科技期刊";被CNKI、CSCD、CA、CABI、CBST等国内外多家知名数据库收录。本刊网站(http://www.plantnutrifert.org)可进行在线投稿、查阅稿件进展情况;网站还公布有最新     

电子商务网站开发中数据库安全问题分析

随着Internet的在中国的普及与发展,人们的生活习惯和交易方式都发生了巨大改变,电子商务逐渐成为商务活动的新兴模式,与此同时电子商务的安全性问题也逐渐凸显出来,成为抑制其发展的重要因素之一。数据库是电子商务网站的核心部分,数据库是否安全直接影响着电子商务网站的正常运营,是确保电子商务网站有效运行的重要基础,采取有效措施确保电子商务网站的数据库安全是非常必要的。     

我国农业网站运营中的问题及其对策

农业网站是加快农业信息传递和传播的重要载体,针对当前我国农业网站发展的基本现状,分析了农业网站发展中服务定位不清晰、运营效率不高、盈利模式不明确等发展＂瓶颈＂问题,指出农业网站的发展壮大需要通过从明晰网站定位、分离网站所有权与经营权和创新网站盈利模式上来解决,对农业网站形成合理的运营机制,更好地服务＂三农＂,具有重要的借鉴和指导意义。     

关于国外农业网站信息的研究

对国外农业网站进行了整体调研,以随机抽取的40个国外农业网站为样本,对网站进行了分类总结,分析了典型网站中的内容、现状和问题,对农业网站发展前景进行了展望。     

土壤施硒对茶树叶片硒及矿质元素含量的影响

以茶树为试材,亚硒酸钠和硒酸钠为硒源,采用土壤沟施的方式,进行田间试验,研究茶树叶片总硒、有机硒及K、Ca、Mg、Zn、Fe含量变化规律。结果表明,土壤施硒可显著提高叶片总硒和有机硒含量,叶片总硒含量随着施肥浓度增加显著升高,随着采样时间延长,先升高后降低,在施肥后5个月达到最大值。茶树对Se(VI)的吸收和转运能力远高于Se(IV),硒酸钠处理叶片总硒含量是亚硒酸钠处理的10.4~25.3倍。茶树吸收无机硒后大部分都转化为较为安全的有机硒,有机硒占总硒比例为91.6%~96.2%。土施不同浓度硒肥,叶片K、Ca、Mg、Zn、Fe含量呈现出波动式升降变化的特点,施硒显著提高嫩叶Zn含量,并显著降低老叶Ca、Fe含量,对叶片K、Mg含量无显著影响。     

伊犁河谷栗钙土区不同产量雨养麦田土壤物理性质比较研究

以伊犁河谷栗钙土区雨养麦田为研究对象,采取田间调查、取样和实验室测定的方法,研究伊犁河谷不同产量水平栗钙土土壤物理指标变化特征,为该地区麦田土壤物理性质的改善和耕层构建提供理论支撑。结果表明:不同产量麦田土壤容重、紧实度从0~10 cm土层到20~40 cm土层均呈现增加的趋势;土壤总孔隙度、水稳性团聚体含量变化趋势刚好与土壤容重、紧实度相反,即0~10 cm> 10~20 cm> 20~40 cm。高产田土壤容重、土壤总孔隙度、紧实度、土壤三相比R值、水稳性团聚体各项指标均优于中、低产田。因此,通过土壤培肥、改进耕作措施改善土壤物理性质十分必要。     

福州市农业科学研究所网站研发技术研究

重点讨论了农科所网站建设中的动态网页技术,采用ASP技术读取服务器端数据库,实现了主页留言板上的用户与管理员之间的信息交流。     

Nutrient release pattern of organic and inorganic resources used in cassava production (Manihot esculenta Crantz)

The major constraint in the promotion of organic farming, a safe and sustainable alternative, is lack of availability of quality organic resources in sufficient quantities. The quality of resources can be ascertained by monitoring its nutrient release pattern, which has not yet been attempted. A controlled condition pot experiment was conducted at ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram, India, in completely randomized design to study the nutrient dynamics of various organic and inorganic resources, commonly used in cassava production, at monthly intervals up to six months. The release of almost all nutrients and activity of soil enzymes were higher at the middle (3 or 4?months) of the incubation period. The pH showed an increasing trend and electrical conductivity, organic C and Fe content declined from initial. Averaging over stages, organic practice favored the activity of soil enzymes and release of almost all nutrients over conventional system significantly, except N.     

Testing of the hydromechanical prediction model of soil erosion under the conditions of Georgia

A hydromechanical model for predicting water (rain-induced) soil erosion was tested on the experimental plots of the Research Institute of Tea and Subtropical Crops in Zendidi village (the Ajara Autonomous Republic) and the Sabashvili Institute of Soil Science, Agrochemistry, and Melioration in Khevi and Kitskhi villages (Upper Imeretia, Western Georgia). A comparison of factual and predicted values of rain-induced erosion for the plots with permanent black fallow showed that the model overestimated the average annual soil loss for the yellow-brown strongly eroded soil in Zendidi village by 23.22 t/ha (133%). This value ranged in different years from 18 to 1052%. For the plots with corn, the predicted value of annual erosion was by 16.94 t/ha higher than the factual value (overestimation of 488%). A comparison of factual and predicted values of rainfall erosion for the plots under sprinkling irrigation also showed that the predicted soil loss was higher than the factual one by 4.14–30.40 t/ha for corn, 6.76–11.14 t/ha for winter wheat, and 15.75–24.12 t/ha for the plots with stubble of winter wheat and barley. Thus, the hydromechanical model for predicting water erosion inadequately describes it under the conditions of Western Georgia and has to be refined.     

浅谈课程网站建设的准备工作

就课程网站制作过程来看,准备工作处于课程网站建设的前期阶段,并未涉及课程的基本教学内容。然而这个阶段的工作将直接影响课程制作的质量和水准,而且课程网站的质量监控和评价都从这里开始,因此,课程网站制作的前期准备工作就成为我们必须重视的一项工作。本文主要讲解学习者需求分析、对象分析、学习环境资源分析以及对参与课程网站制作人员的培训等四方面的准备工作。     

基于图像识别的作物分类种植面积车载测算系统设计

获取作物种植面积是农情监测的主要工作。车载系统进行作物面积测算是作物面积抽样调查的方法之一。文章提出了一种基于图像识别的作物分类种植面积车载测算系统CAOES(Crop Acreage Onboard Estimation System)，分析了其原理与组成，并进行了系统面积测算的视觉测距模型的推导和试验验证。试验验证结果表明：1)镜头焦距定为8 mm能够兼顾纵向视野和图像细节两方面的要求；2)光圈和曝光系数通过软件自适应调节可以满足图像分析需求；3)经验测距模型较之二次多项式回归模型相关系数更大，预测更稳定；4)该系统用于作物面积抽样调查可进一步降低野外调查结束后的工作量，并最大限度地减少人为因素的影响，提高调查的客观性和时效性。     

Enhanced nutrient and rainwater use efficiency in maize and soybean with secondary and micronutrient amendments in the rainfed semi-arid tropics

In view of widespread deficiencies, a long-term experiment was started at the International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India in 2007 to identify economically efficient application strategy (full or 50% dose every or every second year) of sulphur (S) (30 kg ha^?1), boron (B) (0.5 kg ha^?1) and zinc (Zn) (10 kg ha^?1). During the fourth year in 2010, balanced fertilization through adding S, B and Zn increased maize grain yield by 13–52% and soybean yield by 16–28% compared to nitrogen (N) and phosphorus (P) fertilization alone. Balanced nutrition increased N and P uptake, utilization and use efficiency for grain yield and harvest index indicating improved grain nutritional quality. The N, P plus 50% of S, B and Zn application every year recorded highest crop yields and N and P efficiencies indices and increased rainwater use efficiency with a benefit:cost ratio of 11.9 for maize and 4.14 for soybean. This study showed the importance of a deficient secondary nutrient S and micronutrients B, Zn in improving N and P use efficiency while enhancing economic food production.     

Butterfly conservation—The need for a captive breeding institute

There is increasing evidence that local invertebrate populations persist only because of occasional immigration. Demands on land are so great that suites of reserves within the natural dispersal abilities of most species are unlikely to be obtained. Thus there may be little alternative to occasional reintroduction of stock if some species are to be preserved. Moreover, there may be occasions when a species is threatened with extinction due to destruction of its last habitats, and the absence of other suitable sites to which it could be transferred. In such cases there is a need to maintain stocks in captivity for use in future reintroductions. Indeed, this has been the approach followed by vertebrate conservationists, where the ideal of habitat conservation is often prohibitively expensive. Recent methods of rearing butterflies on artificial diets have allowed cost-effective production of large populations of butterflies and moths, even when their natural foodplant is unavailable. These populations may be considerably larger than their natural counterparts. Since it is more efficient to use resources to produce a number of species on one site, it is proposed that the maintenance of stocks of rare species be entrusted to a Captive Breeding Institute established for this purpose. Since the techniques employed have commercial potential in mass-production of species of economic importance, it is hoped that the Institute will be largely self-financing after its initial foundation. In this manner resources will not be diverted from the essential work of habitat conservation.