全文获取类型
收费全文 | 63214篇 |
免费 | 6249篇 |
国内免费 | 4303篇 |
专业分类
林业 | 3694篇 |
农学 | 3523篇 |
基础科学 | 2431篇 |
23228篇 | |
综合类 | 19352篇 |
农作物 | 1980篇 |
水产渔业 | 2934篇 |
畜牧兽医 | 8971篇 |
园艺 | 1142篇 |
植物保护 | 6511篇 |
出版年
2024年 | 505篇 |
2023年 | 1479篇 |
2022年 | 2047篇 |
2021年 | 2295篇 |
2020年 | 2683篇 |
2019年 | 3352篇 |
2018年 | 2700篇 |
2017年 | 3641篇 |
2016年 | 3915篇 |
2015年 | 2984篇 |
2014年 | 3378篇 |
2013年 | 4542篇 |
2012年 | 5542篇 |
2011年 | 4219篇 |
2010年 | 3415篇 |
2009年 | 3234篇 |
2008年 | 2938篇 |
2007年 | 3021篇 |
2006年 | 2665篇 |
2005年 | 2224篇 |
2004年 | 1824篇 |
2003年 | 1549篇 |
2002年 | 1234篇 |
2001年 | 1253篇 |
2000年 | 1136篇 |
1999年 | 828篇 |
1998年 | 668篇 |
1997年 | 646篇 |
1996年 | 561篇 |
1995年 | 598篇 |
1994年 | 535篇 |
1993年 | 430篇 |
1992年 | 401篇 |
1991年 | 347篇 |
1990年 | 252篇 |
1989年 | 225篇 |
1988年 | 141篇 |
1987年 | 118篇 |
1986年 | 62篇 |
1985年 | 29篇 |
1984年 | 17篇 |
1983年 | 16篇 |
1982年 | 20篇 |
1981年 | 12篇 |
1980年 | 24篇 |
1979年 | 18篇 |
1978年 | 8篇 |
1976年 | 9篇 |
1962年 | 7篇 |
1955年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
221.
通过对常用典型风机工作性能和结构特点的分析,结合林木病虫害风送施药防治的要求,提出针对不同高度林木风送施药防治病虫害设备在选用风机类型时的建议和原则。 相似文献
222.
Comparison between the urine dipstick and the pH‐meter to assess urine pH in sheep and dogs 下载免费PDF全文
223.
224.
Gupta RC Canerdy TD Lindley J Konemann M Minniear J Carroll BA Hendrick C Goad JT Rohde K Doss R Bagchi M Bagchi D 《Journal of animal physiology and animal nutrition》2012,96(5):770-777
The investigation was conducted on client-owned moderately arthritic dogs with two objectives: (i) to evaluate therapeutic efficacy of type-II collagen (UC-II) alone or in combination with glucosamine hydrochloride (GLU) and chondroitin sulphate (CHO), and (ii) to determine their tolerability and safety. Dogs in four groups (n = 7-10), were treated daily for a period of 150 days with placebo (Group-I), 10 mg active UC-II (Group-II), 2000 mg GLU + 1600 mg CHO (Group-III), and UC-II + GLU + CHO (Group-IV). On a monthly basis, dogs were evaluated for observational pain (overall pain, pain upon limb manipulation, and pain after physical exertion) using different numeric scales. Pain level was also measured objectively using piezoelectric sensor-based GFP for peak vertical force and impulse area. Dogs were also examined every month for physical, hepatic (ALP, ALT and bilirubin) and renal (BUN and creatinine) functions. Based on observations, significant (p < 0.05) reduction in pain was noted in Group-II, III, and IV dogs. Using GFP, significant increases in peak vertical force (N/kg body wt) and impulse area (N s/kg body wt), indicative of a decrease in arthritis associated pain, were observed in Group-II dogs only. None of the dogs in any group showed changes in physical, hepatic or renal functions. In conclusion, based on GFP data, moderately arthritic dogs treated with UC-II (10 mg) showed a marked reduction in arthritic pain with maximum improvement by day 150. UC-II, GLU and CHO operate through different mechanisms of action, and were well tolerated over a period of 150 days. 相似文献
225.
J Go I Marsh M Gabor V Saunders RL Reece J Frances C Boys LJ Gabor 《Australian veterinary journal》2012,90(12):513-514
Epizootic ulcerative syndrome was diagnosed, and the presence of Aphanomyces invadans confirmed, from an outbreak of clinical disease in wild‐caught bony bream (Nematalosa erebi) from the Darling River near Bourke, in New South Wales, Australia, during 2008. This confirms a significant extension of the agent beyond its historical range. 相似文献
226.
227.
I. Vloutoglou B. D. L. Fitt J. A. Lucas 《European journal of plant pathology / European Foundation for Plant Pathology》1995,101(6):639-653
Conidia ofAlternaria linicola produced on infected linseed crops were mainly dispersed by wind. The numbers of conidia in the air above linseed crops collected by a Burkard spore sampler were greatest between 1200 h and 1300 h, when the relative humidity was lowest. Although numbers of conidia collected decreased with increasing height within and above the crop canopy, air-borneA. linicola conidia were present up to 80 cm above the crop canopy. Conidia ofA. linicola were transported by wind up to at least 40 m downwind from an artificial line inoculum source, but their numbers decreased with increasing distance from the source. In 1991, 1992, and 1993, the dispersal ofA. linicola conidia above linseed crops followed a seasonal periodicity which was influenced by weather conditions and cultural practices. The greatest numbers of conidia were collected during July, August and early September and coincided with periods favourable for sporulation and with an increase in the incidence of the disease in the senescent crop. Air-borneA. linicola conidia produced on point or line inoculum sources (naturally infected linseed stem debris) were responsible for the spread of the disease in linseed crops. In 1992 and 1993, the disease was first detected downwind from the sources, but by the end of the growing seasons, it had spread in all directions and up to 20 m and 60 m from the sources, respectively. Disease gradients were initially steep near the inoculum sources but they became flatter with time due to the secondary spread of the disease. 相似文献
228.
229.
《Soil biology & biochemistry》2011,43(6):1285-1291
Two common plant species of temperate wet grasslands, Carex acuta and Glyceria maxima, were tested for their preferences in the uptake of different nitrogen (N) sources (amino acid, ammonium, nitrate) and their ability to compete for these sources with soil microorganisms. The experiment was a one-day incubation study with plants growing in soil obtained from the field, which was supplied with a solution containing the three N sources, one at a time labeled with 15N. The bulk of the N demand of both species was covered by nitrate-N, which was the dominant N form in the soil at the time of the experiment. Ammonium-N was taken up less strongly, and organic N formed only a negligible part of their nutrition. The assimilated inorganic N was preferentially transported to apical meristem of the youngest leaf, while organic N remained mostly in the roots. The fast-growing Glyceria took up more N and was a better competitor vis-à-vis soil microbes for rarer N forms than Carex. However, both plants were poor competitors for N vis-à-vis soil microbes, irrespective of the N form. Microbes took up nitrate ca. five times faster and organic N more than a hundred times faster than plants. Correspondingly, the calculated turnover time of microbial N was 17 days, compared to 40 days for N in plant roots. A significant amount of added 15N was found at non-exchangeable sites in the soil, which points to the importance of microbial N transformation and abiotic N fixation for N retention in soil. In summary, the preferential assimilation of inorganic N by the wetland plants studied here and their poor ability to compete for N with soil microbes over the short term agree with the results of studies carried out with other species from temperate grasslands. 相似文献
230.
The impacts of tillage and cropping sequences on soil organic matter and nutrients have been frequently reported to affect the uppermost soil layers, but there is little published information concerning effects at greater depth. This article reports results on the distribution of soil organic carbon (SOC), active carbon (AC), N, Olsen‐P and extractable K within 100 cm in short (4 yr) and long (16 yr) term experiments under different tillage systems. Short (TT4) and long (TT16) traditional tillage are compared with conservation tillage, reduced (RT16) and non‐tillage (NT4). The results show more accumulation of SOC in the near‐surface under RT16 and NT4 in both experiments compared with traditional tillage. Moreover, greater C content occurs to 40 cm depth in the long‐term experiment. The results demonstrate the importance of time on C accumulation, not only in near‐surface layers but also at greater depths. Active C is an indicator of the increase in soil quality in the long‐term experiment. This trend is only apparent for the first 10 cm in the short‐term experiment. Patterns in N, Olsen‐P and extractable K are similar to that of SOC. However, only extractable K is significantly greater in soil under conservation tillage (RT16 and NT4) after short and long periods. Potassium availability is a good indicator of the changes caused by tillage. Our results indicate that studies of soils at depth could be very useful in long‐term experiments to demonstrate the effect of conservation tillage on C and nutrient distribution. 相似文献