全文获取类型
收费全文 | 25766篇 |
免费 | 1364篇 |
国内免费 | 19篇 |
专业分类
林业 | 942篇 |
农学 | 824篇 |
基础科学 | 181篇 |
3972篇 | |
综合类 | 3610篇 |
农作物 | 973篇 |
水产渔业 | 1393篇 |
畜牧兽医 | 13322篇 |
园艺 | 294篇 |
植物保护 | 1638篇 |
出版年
2020年 | 234篇 |
2019年 | 337篇 |
2018年 | 528篇 |
2017年 | 611篇 |
2016年 | 548篇 |
2015年 | 375篇 |
2014年 | 501篇 |
2013年 | 1085篇 |
2012年 | 850篇 |
2011年 | 1018篇 |
2010年 | 724篇 |
2009年 | 693篇 |
2008年 | 1000篇 |
2007年 | 941篇 |
2006年 | 833篇 |
2005年 | 746篇 |
2004年 | 649篇 |
2003年 | 712篇 |
2002年 | 610篇 |
2001年 | 803篇 |
2000年 | 791篇 |
1999年 | 624篇 |
1998年 | 266篇 |
1997年 | 277篇 |
1995年 | 256篇 |
1993年 | 230篇 |
1992年 | 423篇 |
1991年 | 519篇 |
1990年 | 435篇 |
1989年 | 413篇 |
1988年 | 400篇 |
1987年 | 409篇 |
1986年 | 364篇 |
1985年 | 389篇 |
1984年 | 339篇 |
1983年 | 289篇 |
1982年 | 243篇 |
1979年 | 383篇 |
1978年 | 290篇 |
1977年 | 291篇 |
1976年 | 300篇 |
1975年 | 317篇 |
1974年 | 332篇 |
1973年 | 302篇 |
1972年 | 290篇 |
1971年 | 245篇 |
1969年 | 289篇 |
1968年 | 269篇 |
1967年 | 326篇 |
1966年 | 304篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
A. N. Zelenov I. V. Kondykov N. V. Shelepina T. N. Suchkova N. N. Sulimova 《Russian Agricultural Sciences》2014,40(4):244-248
To produce biodegradable polymers and dietary food, the concept of the selection of pea plant for a high content of amylose in the starch of seeds was developed. The key parameters of the high-amylose varieties and specific indicators for selection were determined. The sources and donors of economically valuable signs were displayed, and the first in Russia variety of a new type—the Amior—was created. For dietetic therapy, the authors developed the recipes for the preparation of the functional grades of bread and macaroni with the addition of an enzyme-resistant starch. 相似文献
43.
E. I. Simonovich L. Yu. Goncharova E. I. Shimanskaya 《Russian Agricultural Sciences》2014,40(1):54-56
The positive effect of the application of different fertilizers on agrochemical indicators, enzyme activity of ordinary chernozem, and yield of coneflower purple plants was revealed. 相似文献
44.
45.
Malik Muniba Abid Munir Haider Muhammad Saleem Zhai Ying Khan Muhammad Azmat Ullah Pappu Hanu R. 《植物病害和植物保护杂志》2023,130(1):23-33
Journal of Plant Diseases and Protection - Mastreviruses are an emerging group of viruses transmitted by leafhoppers and infect both monocot and dicot plants. Chickpea chlorotic dwarf virus... 相似文献
46.
Iñigo Loureiro María Concepción Escorial María Cristina Chueca 《Pest management science》2023,79(6):2247-2254
BACKGROUND
Cultivated bread wheat (Triticum aestivum L.) spontaneously hybridizes with wild/weedy related Aegilops populations, but little is known about the actual rates at which this hybridization occurs under field conditions. It is very important to provide reliable empirical data on this phenomenon in order to assess the potential crop–wild introgression, especially in the context of conducting risk assessments for the commercialization of genetically modified (GM) wheat, as gene flow from wheat to Aegilops species could transfer into the wild species genes coding for traits such as resistance to herbicides, insects, diseases or environmental stresses.RESULTS
The spontaneous hybridization rates between wheat and A. geniculata and A. triuncialis, which are very abundant in the Mediterranean area, have been estimated for the first time in the northern part of the Meseta Central, the great central plateau which includes the largest area of wheat cultivation in Spain. Hybridization rates averaged 0.12% and 0.008% for A. geniculata and A. triuncialis, respectively. Hybrids were found in 26% of A. geniculata and 5% of A. triuncialis populations, at rates that can be ≤3.6% for A. geniculata and 0.24% for A. triuncialis.CONCLUSION
The detection of Aegilops spp.–wheat hybrids in Aegilops populations indicates that gene flow can occur, although wheat is considered a crop with a low-to-medium risk for transgene escape. These data on field hybridization rates are essential for GM wheat risk assessment purposes. © 2023 Society of Chemical Industry. 相似文献47.
Yuanbo Li Peng Zhang Mingshu Li Noman Shakoor Muhammad Adeel Pingfan Zhou Manlin Guo Yaqi Jiang Weichen Zhao BenZhen Lou Yukui Rui 《Pest management science》2023,79(1):21-36
Nanotechnology is a young branch of the discipline generated by nanomaterials. Its development has greatly contributed to technological progress and product innovation in the field of agriculture. The antimicrobial properties of nanoparticles (NPs) can be used to develop nanopesticides for plant protection. Plant diseases caused by bacterial and fungal infestations are the main types of crop diseases. Once infected, they will seriously threaten crop growth, reduce yield and quality, and affect food safety, posing a health risk to humans. We reviewed the application of metal-based nanoparticles in inhibiting plant pathogenic bacteria and fungi, and discuss the antibacterial mechanisms of metal-based nanoparticles from two aspects: the direct interaction between nanoparticles and pathogens, and the indirect effects of inducing plant resilience to disease. © 2022 Society of Chemical Industry. 相似文献
48.
Clinical,histopathological and immunohistochemical characterization of a novel equine ocular disorder: heterochromic iridocyclitis with secondary keratitis in adult horses 下载免费PDF全文
49.
50.
The effect of including genomic relationships in the estimation of genetic parameters of functional traits in pigs 下载免费PDF全文
T. Aasmundstad I. Andersen‐Ranberg Ø. Nordbø T. Meuwissen O. Vangen E. Grindflek 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2015,132(5):386-391
The term functionality in animal breeding is used for traits that increase the efficiency of production by lowering the input cost, such as animal health and leg weakness related to longevity. The main objective of the study was to investigate the impact of genomic information, in a multivariate variance component analysis, on some of these traits. In addition, the effect of the inclusion was studied by testing the model's prediction ability based on best linear unbiased estimates for fixed and random effects. The material in this study consists of phenotypes from 76 683 animals, of which 4933 animals are genotyped. The heritabilities for front leg conformation, stayability, osteochondrosis and arched back, estimated using the traditional pedigree, were found to be between 0.12 and 0.29. When using the combined genomic and pedigree relationship matrix, the heritabilities were between 0.14 and 0.36. The results show that the combined relationship matrix can be used for the estimation of (co)variance components, and that the predictive ability of the model in this study marginally increases with the inclusion of genomic information. 相似文献