全文获取类型
收费全文 | 2582篇 |
免费 | 383篇 |
国内免费 | 12篇 |
专业分类
林业 | 247篇 |
农学 | 151篇 |
基础科学 | 242篇 |
128篇 | |
综合类 | 1900篇 |
农作物 | 86篇 |
水产渔业 | 45篇 |
畜牧兽医 | 117篇 |
园艺 | 44篇 |
植物保护 | 17篇 |
出版年
2025年 | 25篇 |
2024年 | 82篇 |
2023年 | 54篇 |
2022年 | 77篇 |
2021年 | 84篇 |
2020年 | 100篇 |
2019年 | 101篇 |
2018年 | 35篇 |
2017年 | 58篇 |
2016年 | 103篇 |
2015年 | 85篇 |
2014年 | 189篇 |
2013年 | 161篇 |
2012年 | 252篇 |
2011年 | 237篇 |
2010年 | 200篇 |
2009年 | 173篇 |
2008年 | 181篇 |
2007年 | 187篇 |
2006年 | 181篇 |
2005年 | 115篇 |
2004年 | 72篇 |
2003年 | 70篇 |
2002年 | 58篇 |
2001年 | 44篇 |
2000年 | 29篇 |
1999年 | 14篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有2977条查询结果,搜索用时 15 毫秒
41.
42.
分析了吉林省民营经济发展现状,归纳了其发展中存在差距和问题,探讨了其发展滞后的影响因素,提出了吉林省民营企业发展的制度创新思路。 相似文献
43.
分析了目前高校图书馆导读工作存在的问题,探讨了挖掘导读工作的潜力,根据导读工作的内涵,着重分析了现代导读工作在科研创新中的重要作用,提出了使导读更好地服务于科研创新的策略。 相似文献
44.
In Morocco, many farmers enthusiastically use drip irrigation. However, few drip irrigation systems conform to engineering standards. In a process they refer to as bricolage, farmers modify and adapt standard designs, thus creating their own technical standards. We document three instances of bricolage and show that it is a useful term to explain irrigation innovation processes. Through bricolage farmers adapt and modify the system to their needs, but also enter a process of gradual learning about what drip irrigation is and what it can achieve. Bricolage has led to the multiplication and diversification of drip systems, with different categories of users co‐designing the nature and direction of change it provokes. Through bricolage, local actors effectively share responsibilities of the design process with engineers. The paper concludes that the fact that drip irrigation lends itself to bricolage helps explain its success as an innovation. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
45.
Güinope, Honduras was the site of a highly acclaimed people-centered development project in the 1980s. The ACORDE/Ministry
of Natural Resource/World Neighbors Integrated Development Program (IDP) was unique for its time, since rather than relying
on technology transfer, it promoted innovation skills for local generation of responses to needs. Furthermore, it was one
of the first efforts in Latin America to employ villagers as principal agents of change. Fifteen years after the inception
of the IDP and ten years after its completion, the authors interviewed farmers in their fields and held a series of participatory
workshops over eighteen months with ten outstanding farmers who had become project leaders. The leaders identified influential
factors behind their involvement and produced recommendations for rural development interventions. Further, a generalized
concept map typifying ideal characteristics for farmer promoters was constructed. Recommendations for development agencies
centered on project design and implementation, demanding a methodology for strengthening local innovative capacities, participation,
and control over resources. Ultimately, the leaders downplayed the role of technologies in rural development and called for
special attention to enabling communities to confront external pressures, in particular recent government ``modernization'
policies, that they felt threatened community livelihood.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
46.
王颖 《农业图书情报学刊》2003,(2):89-91
作者简要介绍了“知识经济时代”的由来和特征,指出新时代机遇与挑战的紧迫性,并从农业科技期刊的办刊角度提出具体建议与作法。 相似文献
47.
48.
《Land Degradation u0026amp; Development》2018,29(8):2694-2706
Restoring degraded soils to support food production is a major challenge for West African smallholders who have developed local innovations to counter further degradation. The objective of this study was to evaluate a local farmer's technique that uses ramial wood (RW) as soil amendment (Piliostigma reticulatum shrub). Three treatments were applied in an experimental plot in Burkina Faso: control (no amendment), low RW (3 Mg fresh mass·ha−1·yr−1), and high RW (12 Mg fresh mass·ha−1·yr−1). RW was chipped to <5‐cm pieces and either buried or mulched. Topsoil carbon (C), nitrogen (N), and phosphorus (P) in control and low‐RW treatments declined after 7 years of continuous sorghum cultivation. Use of high‐RW amendment stabilized soil C content while N and P declined, thus not replenishing nutrient exports. Net contribution to soil C in the layer measuring 0–15 cm was 15% of the applied C in the high‐RW amendments. Although biomass and grain yields were higher in high‐RW treatments, crop productivity declined throughout the experiment for all treatments. Termite casts on RW treatments evidenced the potential role of wood‐foraging termites in diluting the impact of RW on soil fertility build‐up and soil water content. We conclude that mitigating soil degradation under semiarid conditions in Burkina Faso would require large amounts of woody amendments, particularly if the level of termite activity is high. Additional nutrient sources would be needed to compensate for removal in exported products so that biomass and grain production can be stabilized or increased. 相似文献
49.
教学与科研结合 提高本科教学质量 总被引:1,自引:0,他引:1
林向阳 《农产品加工.学刊》2009,(12):89-92
教学改革一直是全国高校教育改革的重中之重。近几年,福州大学在教学体制改革,尤其是如何利用自身有利条件,推行教学与科研结合的"导师制"、"3+1"教学人才培养模式、学生参加SRPT项目和各种专业竞赛等教学模式上,取得了良好效果。以生物科学与工程学院为例,总结探讨了该项改革方案的一些收获和建议。 相似文献
50.
服饰广告的本体功能是促进服饰商品的销售。设计师借助美学手段进行审美创作,能巧妙地融服饰广告的经济价值于审美价值之中,从而达到吸引受众眼球,提升服饰商品的知名度、美誉度,实现销售商品的终极目的。从美学的角度对服饰广告创意的表现手法进行审视,有助于指导具体的广告创作实践,提升服饰广告的审美价值,实现美学与服饰广告的完美结合。 相似文献