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   139061篇
  免费   4782篇
  国内免费   59篇
林业   5578篇
农学   4641篇
基础科学   894篇
  17583篇
综合类   18959篇
农作物   5094篇
水产渔业   7157篇
畜牧兽医   73148篇
园艺   1798篇
植物保护   9050篇
  2020年   1243篇
  2019年   1466篇
  2018年   2229篇
  2017年   2495篇
  2016年   2316篇
  2015年   1999篇
  2014年   2451篇
  2013年   5731篇
  2012年   4350篇
  2011年   5163篇
  2010年   3502篇
  2009年   3547篇
  2008年   5152篇
  2007年   4970篇
  2006年   4641篇
  2005年   4261篇
  2004年   4108篇
  2003年   4174篇
  2002年   3808篇
  2001年   4773篇
  2000年   4641篇
  1999年   3747篇
  1998年   1471篇
  1997年   1452篇
  1996年   1341篇
  1995年   1599篇
  1994年   1326篇
  1993年   1359篇
  1992年   2762篇
  1991年   2901篇
  1990年   2866篇
  1989年   2897篇
  1988年   2610篇
  1987年   2592篇
  1986年   2539篇
  1985年   2400篇
  1984年   1956篇
  1983年   1715篇
  1982年   1154篇
  1979年   1649篇
  1978年   1284篇
  1977年   1135篇
  1976年   1100篇
  1975年   1164篇
  1974年   1357篇
  1973年   1448篇
  1972年   1378篇
  1971年   1195篇
  1970年   1247篇
  1969年   1146篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
172.
Seroprevalence of Neospora caninum in dairy cattle in Bahia, Brazil.   总被引:2,自引:0,他引:2  
Sera collected from 447 dairy cattle on 14 dairy farms were tested for Neospora caninum antibodies by use of an immunofluorescent antibody technique. Positive reactions with titres > or =1:200 were found in 63 (14.09%) of animals. Neospora positive sera were also tested for Toxoplasma gondii antibodies by using a commercial latex agglutination test. Antibodies to T. gondii were detected in 3 (4.76%) of 63 N. caninum positive sera. These results indicate that N. caninum infection is widespread among dairy cattle in Bahia state.  相似文献   
173.
ABSTRACT Production of cacao in tropical America has been severely affected by fungal pathogens causing diseases known as witches' broom (WB, caused by Moniliophthora perniciosa), frosty pod (FP, caused by M. roreri) and black pod (BP, caused by Phytophthora spp.). BP is pan-tropical and causes losses in all producing areas. WB is found in South America and parts of the Caribbean, while FP is found in Central America and parts of South America. Together, these diseases were responsible for over 700 million US dollars in losses in 2001 (4). Commercial cacao production in West Africa and South Asia are not yet affected by WB and FP, but cacao grown in these regions is susceptible to both. With the goal of providing new disease resistant cultivars the USDA-ARS and Mars, Inc. have developed a marker assisted selection (MAS) program. Quantitative trait loci have been identified for resistance to WB, FP, and BP. The potential usefulness of these markers in identifying resistant individuals has been confirmed in an experimental F(1) family in Ecuador.  相似文献   
174.
Summary Seasonal effects of liming, irrigation, and acid precipitation on microbial biomass N and some physicochemical properties of different topsoil horizons in a spruce forest (Picea abies L.) were measured throughout one growing season. The highest biomass N was recorded in autumn and spring in the upper soil horizons, while the lowest values were obtained in summer and in deeper horizons. The clearest differences between the different soil treatments were apparent in autumn and in the upper horizons. Liming increased the microbial biomass N from 1.7% of the total N content to 6.8% (Olf1 layer) and from 1% to 2% of the total N content in the Of2 layer. The main inorganic-N fraction in the deeper horizons was NO inf3 sup- . An increase in cation exchange capacity was observed down to the Oh layer, while soil pH was only slightly higher in the Olf1 and Of2 layers after liming. The effects of irrigation were less marked. The microbial biomass N increased from 1.7% of total N to 4.8% in the Olf1 layer and from 1% to 2% of total N in the Of2 layer. In the Olf1 layer an increase in C mineralization was observed. Acid precipitation decreased the microbial biomass N in the upper horizons from 4.8% of total N to 1.8% in the Olf1 layer and from 2% to 0.5% in the Of2 layer. No significant changes in soil pH were observed, but the decrease in cation exchange capacity may result in a decrease in the proton buffering capacity in the near future.  相似文献   
175.
In greenhouse and field experiments, shedding of pepper leaves infected withLeveillula taurica was inhibited by treatments with indole acetic acid or butyric acid. Spraying with MnSO4 increased shedding in greenhouse trials.  相似文献   
176.
177.
Food systems educators face a double challenge: (1) the inherent change in scope and perspective from raising animals to producing safe food in an environmentally conscientious manner; and (2) the unprecedented demand for higher education, both nationally and internationally. In the modern world, small numbers of producers are capable of feeding a growing population. As demographics have shifted from rural to urban areas, more global livelihoods are derived from manufacturing and services than from agriculture. Education, as one of those services, is accounting for an increasing percentage of world trade, through the physical translocation of students and, more recently, through online education. Within the veterinary realm, colleges outside the United States seek accreditation to better compete for students, and there is increasing pressure from private schools. Today's food systems require a high level of veterinary expertise, with specialization in a particular production system as well as the ability to contribute as part of a larger team that can address economic, bio-security, biological-waste, animal-welfare, food-safety, and public-health concerns. The need for different expertise from food systems specialists (indeed, shortages of all types of veterinary specialists), combined with global competition in education, is a call to action for the veterinary profession. This is an opportunity to revisit and reorganize the delivery of veterinary education, making use of new collaborative technologies for greater efficiency and effectiveness.  相似文献   
178.
Understanding existing levels of genetic diversity of sheep breeds facilitates in situ and ex situ conservation activities. A comprehensive evaluation of US sheep breeds has not been previously performed; therefore, we evaluated the genetic diversity among and within 28 US sheep breeds. Both major and minor breeds were included in the analysis and consisted of 666 animals from 222 producers located in 38 states. The level of within-breed genetic diversity was variable and not dependent upon status of a breed as a major or minor breed. Bayesian cluster analysis indicated the breeds were grouped more by physiological differences (meat vs. wool production) rather than geographic origin. Results suggest several actionable items to improve in situ and ex situ conservation. The results clearly identify breeds in need of increased in situ and ex situ management (e.g., Hog Island and Karakul) and allow several suggestions for in situ management of flocks. Conversely, several of the breeds appear genetically similar and therefore require less emphasis on collecting germplasm samples for the gene bank. Commercially important breeds (e.g., Rambouillet and Suffolk) were found to have substantial variation, which should enable breeders to proceed, unencumbered by genetic diversity concerns, with selection strategies that maximize profit.  相似文献   
179.
180.
Postlarvae or juveniles of Macrobrachium rosenbergii produced in Mauritius are sold at unit price to prawn farmers and are counted individually by hand. This process is time consuming, labour intensive, subject to error and may stress the juveniles; safe rapid electronic counting would be highly advantageous.The design of the hydraulic component of a successful counter prototype, Type A, is described. The counter has 10 parallel channels through which juveniles are carried in a water current. The detection of juveniles passing through these channels can be done photo-electrically. The counter accepts juveniles up to 15 mm in length (eye orbit to tip telson) and has the significant advantage that it can be constructed using only simple hand tools.Survival and growth rate tests, and microscopic examination for damage to appendages of juveniles were done on machine counted and hand counted juveniles. There was no reduction of growth or survival caused by passage through the counter by comparison with the hand counting method, and it is concluded that the counter is not detrimental to juvenile prawns.About 70% of all juveniles tested showed highly variable amounts of damage. The great majority of this damage appears to originate in the hatchery tanks, prior to the experimental treatments. Only in the case of antennules could the use of the counter be shown to increase damage significantly, i.e. from 25% to 38%, but this has no detectable effect on subsequent survival or growth.This appears to be the first counter made specifically for counting macroscopic crustacean juveniles, and via suitable scaling, adaptation to counting other species of crustaceans, fish larvae, etc., should be possible.  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