全文获取类型
收费全文 | 106381篇 |
免费 | 5816篇 |
国内免费 | 778篇 |
专业分类
林业 | 7390篇 |
农学 | 4020篇 |
基础科学 | 832篇 |
14531篇 | |
综合类 | 17693篇 |
农作物 | 5406篇 |
水产渔业 | 6097篇 |
畜牧兽医 | 47172篇 |
园艺 | 2316篇 |
植物保护 | 7518篇 |
出版年
2021年 | 930篇 |
2020年 | 999篇 |
2019年 | 1121篇 |
2018年 | 4199篇 |
2017年 | 4366篇 |
2016年 | 2825篇 |
2015年 | 1702篇 |
2014年 | 1896篇 |
2013年 | 3477篇 |
2012年 | 4318篇 |
2011年 | 6074篇 |
2010年 | 4556篇 |
2009年 | 3595篇 |
2008年 | 4884篇 |
2007年 | 4981篇 |
2006年 | 3143篇 |
2005年 | 3152篇 |
2004年 | 2865篇 |
2003年 | 2926篇 |
2002年 | 2623篇 |
2001年 | 2701篇 |
2000年 | 2746篇 |
1999年 | 2123篇 |
1998年 | 848篇 |
1997年 | 757篇 |
1995年 | 791篇 |
1994年 | 699篇 |
1993年 | 703篇 |
1992年 | 1598篇 |
1991年 | 1779篇 |
1990年 | 1693篇 |
1989年 | 1636篇 |
1988年 | 1527篇 |
1987年 | 1564篇 |
1986年 | 1613篇 |
1985年 | 1437篇 |
1984年 | 1222篇 |
1983年 | 1040篇 |
1982年 | 692篇 |
1979年 | 1086篇 |
1978年 | 845篇 |
1976年 | 726篇 |
1975年 | 758篇 |
1974年 | 1024篇 |
1973年 | 1000篇 |
1972年 | 971篇 |
1971年 | 897篇 |
1970年 | 871篇 |
1969年 | 821篇 |
1967年 | 714篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
旨在调查川西北牦牛哺乳动物正呼肠孤病毒(MRV)的感染情况并分离病毒。采用RT-PCR方法,对采自川西北15个牧场的72份牦牛腹泻粪便样本和其中5个牧场的15份腹泻牦牛血清样本进行MRV检测,阳性样本进一步用分型PCR确定其血清型。结果显示,粪便样本中MRV检出率为20.83%(15/72),血清2型的比例为60%(9/15);血清样本中MRV检出率为40%(6/15),血清2型的比例为83.33%(5/6);未检测到其他血清型。成功地从腹泻粪便中分离到1株MRV血清2型毒株(TCID50为4×10-8.56·mL-1),并获得长度为23 587 bp的分离株全基因组,该分离株与中国猪源毒株的遗传关系最近;与GenBank中所有的MRV S1基因相比,该分离株有4个独特的氨基酸突变。本研究从牦牛中检测到MRV,并分离到1株牛源MRV血清2型毒株,为进一步研究MRV血清2型生物学特性奠定了基础。 相似文献
2.
3.
4.
Still Only One Earth. Progress in the 40 years since the First UN Conference on the Environment. By R.E. Hester & R.M. Harrison (eds). Published by Royal Society of Chemistry,Cambridge, 2015. vii + 285 pp. £67.50. Hardback (ISBN 978‐1‐78262‐076‐1).
下载免费PDF全文
R. L. Hough 《Soil Use and Management》2017,33(1):176-176
5.
Do cover crops change the lability of phosphorus in a clayey subtropical soil under different phosphate fertilizers? 下载免费PDF全文
A. P. B. Teles M. Rodrigues W. F. Bejarano Herrera A. Soltangheisi L. R. Sartor P. J. A. Withers P. S. Pavinato 《Soil Use and Management》2017,33(1):34-44
Plants have developed different mechanisms to absorb and solubilize phosphorus (P) in the soil, especially in environments with low P availability. This study evaluated the effects of different winter cover crops on soil P availability in a clayey subtropical (Hapludox) soil receiving soluble P fertilizer and a rock phosphate applied to the summer crop, under no‐tillage. The experiment was carried out over 3 yrs (2009–2011) with five different cover crop species: common vetch, fodder radish, ryegrass, black oat, white clover and fallow as control. The soil was sampled after the third year of cover crop cultivation and analysed for inorganic and organic P forms according to the well‐established Hedley fractionation procedure. Phosphate fertilizers promoted accumulation of both labile and nonlabile P pools in soil in the near surface layer, especially under rock phosphate. Fertilizer applications were not able to change P fractions in deeper layers, emphasizing that the Brazilian clayey soils are a sink of P from fertilizer and its mobility is almost nil. Although the cover crops recycled a great amount of P in tissue, in a short‐term evaluation (3 yrs) they only changed the content of moderately labile P in soil, indicating that long‐term studies are needed for more conclusive results. 相似文献
6.
Maria Antonia Machado Barbosa Kacilda Naomi Kuki Pedro Santos Peno Bengala Emilly dos Santos Pereira Angélica Fátima de Barros Sebastián Giraldo Montoya Leonardo Duarte Pimentel 《Journal of Agronomy and Crop Science》2020,206(2):263-276
Environmental conditions influence phenology and physiological processes of plants. It is common for maize and sorghum to be sown at two different periods: the first cropping (spring/summer) and the second cropping (autumn/winter). The phenological cycle of these crops varies greatly according to the planting season, and it is necessary to characterize the growth and development to facilitate the selection of the species best adapted to the environment. The aim of this study was to characterize phenological phases and physiological parameters in sorghum and maize plants as a function of environmental conditions from the first cropping and second cropping periods. Two parallel experiments were conducted with both crops. The phenological characterization was based on growth analyses (plant height, leaf area and photoassimilate partitioning) and gas exchange evaluations (net assimilation rate, stomatal conductance, transpiration and water-use efficiency). It was found that the vegetative stage (VS) for sorghum and maize plants was 7 and 21 days, respectively, longer when cultivated during the second cropping. In the first cropping, the plants were taller than in the second cropping, regardless of the crop. The stomatal conductance of sorghum plants fluctuated in the second cropping during the development period, while maize plants showed decreasing linear behaviour. Water-use efficiency in sorghum plants was higher during the second cropping compared with the first cropping. In maize plants, in the second cropping, the water-use efficiency showed a slight variation in relation to the first cropping. It was concluded that the environmental conditions as degree-days, temperature, photoperiod and pluvial precipitation influence the phenology and physiology of both crops during the first and the second cropping periods, specifically cycle duration, plant height, leaf area, net assimilation rate, stomatal conductance and water-use efficiency, indicating that both crops respond differentially to environmental changes during the growing season. 相似文献
7.
Mark D. Rawling Nicola Pontefract Ana Rodiles Ilektra Anagnostara Eric Leclercq Marion Schiavone Mathieu Castex Daniel L. Merrifield 《Journal of the World Aquaculture Society》2019,50(6):1108-1122
Fish were fed a single‐strain yeast fraction (SsYF; 2 g/kg) or a multistrain yeast fraction (MsYF; 0.8 g/kg) for 10 weeks. The results demonstrated significant (p ≤ 0.03) elevations in weight gain, specific growth rate, protein efficiency ratio, and feed conversion ratio in fish fed the yeast fraction‐supplemented diets. In the distal intestine, a significant elevation in microvilli density was observed after 5 and 10 weeks of dietary supplementation with MsYF and SsYF, respectively, compared to control fed fish (p < 0.001). A significant elevation (p = 0.02) in the perimeter ratio was observed in fish fed diets supplemented with the yeast fractions. After 10 weeks of feeding on the experimental diets, Rt‐qPCR demonstrated a significant downregulation (p < 0.05) in the stress response genes, heat‐shock protein 70 (hsp70) and proliferating cell nuclear antigen (pcna), in fish fed diets supplemented with the yeast fractions. Significant (p < 0.05) elevations in interleukin 1‐beta (il1β) and interleukin‐10 (il10) gene expression were observed in fish fed diets supplemented with the MsYF compared to the other dietary groups. These findings suggest that feeding an MsYF specifically at a lower incorporation rate < 1 g/kg, compared to a commercial SsYF at 2 g/kg, is effective in improving the intestinal health status and growth performance of European seabass. 相似文献
8.
10.