首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   304篇
  免费   19篇
林业   30篇
农学   54篇
基础科学   2篇
  38篇
综合类   18篇
农作物   31篇
水产渔业   4篇
畜牧兽医   108篇
园艺   4篇
植物保护   34篇
  2021年   6篇
  2020年   6篇
  2018年   6篇
  2017年   15篇
  2016年   6篇
  2015年   8篇
  2014年   4篇
  2013年   16篇
  2012年   15篇
  2011年   15篇
  2010年   14篇
  2009年   6篇
  2008年   6篇
  2007年   24篇
  2006年   7篇
  2005年   12篇
  2004年   8篇
  2003年   8篇
  2002年   10篇
  2001年   3篇
  2000年   3篇
  1999年   5篇
  1998年   5篇
  1997年   8篇
  1996年   2篇
  1995年   2篇
  1994年   2篇
  1993年   2篇
  1992年   2篇
  1991年   5篇
  1990年   2篇
  1989年   3篇
  1988年   7篇
  1987年   4篇
  1986年   6篇
  1985年   2篇
  1984年   5篇
  1981年   3篇
  1980年   5篇
  1979年   5篇
  1978年   4篇
  1977年   3篇
  1976年   2篇
  1975年   5篇
  1973年   2篇
  1971年   5篇
  1970年   4篇
  1969年   2篇
  1967年   5篇
  1966年   2篇
排序方式: 共有323条查询结果,搜索用时 0 毫秒
11.
Rinderpest antibodies were detected by employing the fluorescent antibody test (FAT) and the immunoperoxidase test (IPT) and the results were compared with the counterimmuno electrophoresis test (CIE). FAT was found to be the most sensitive in detecting post-vaccinal antibodies followed by IPT and CIE tests.  相似文献   
12.
13.
Skin problems are common in small animal practice. Oxidative stress, or the imbalance between prooxidants and the body's antioxidant defense system, likely plays a role in the development of skin disease. According to this study, increasing amounts of vitamin E in foods for dogs and cats increases serum and cutaneous concentrations of vitamin E. Based on available scientific data, these increases in vitamin E concentration are likely to be beneficial. However, the relationship between increases in serum and skin vitamin E concentrations and the prevention, development, and treatment of skin disease remains to be elucidated by intervention studies.  相似文献   
14.
15.
16.
The oviposition and development of the grain bettle Oryzaephilus mercator Faur.on dry fruit meals. Oryzaephilus mercator showed enormous variation in egg laying on different dry fruit meals (apricot, cashew, almond, groundnut, coconut, fig, date and raisin). The lowest egg period was 4.1 days on almond and the highest on apricot 5.1 days. The egg mortality on various meals differed to a small extent (11.8 to 14.1%). The larval period ranged between 22.7 to 34.3 days. The larval mortality ranged between 7.8% (almond) to 94.4% (raisin).  相似文献   
17.
18.
19.
Wild pigs are a free-ranging invasive species capable of inflicting significant damage on rural property. Wildlife management personnel may benefit from understanding the negative societal impact of wild pigs. A statewide mail survey of randomly selected landowners was conducted in rural Tennessee counties known to have wild pigs. The economic value of damage caused by wild pigs in 2015 in these counties was estimated at $26.22 million, whereas the cost incurred in control and eradication was $2.09 million. Input-output modeling of damage in these counties on the state’s economy showed $32.8 million in lost industrial output, $4.6 million in lost labor income, and 332 jobs or job equivalents affected. Findings are useful in understanding the types of damage, and the extent of these impacts on the rural economy. They could also facilitate comparing the expected benefit with the cost of control programs in Tennessee and comparable areas facing similar invasions from wild pigs.  相似文献   
20.
Plant-based phosphorus (P) remediation strategies have been suggested to reduce high P accumulation in soil. Eleven fodder soybean genotypes were evaluated to explore their potential for the removal of P from poultry manure-enriched soils. Field experiments were conducted at a site that had a history of heavy poultry manure applications. Green house experiments were conducted using the soils selected for field trials to confirm the results. Harvesting of whole plants, excluding roots of the genotypes, was done at the pod formation stages and plant samples were oven dried at 70°C for three days. The dry samples were ground and analyzed for total P content. Genotype 091734, provided the maximum P removal from amended and unamended soils. Fodder soybean genotypes could play an important role in the extraction of P from poultry manure-enriched soils, which are important from the ecological point of view.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号