全文获取类型
收费全文 | 258篇 |
免费 | 28篇 |
国内免费 | 1篇 |
专业分类
林业 | 29篇 |
农学 | 15篇 |
基础科学 | 1篇 |
117篇 | |
综合类 | 18篇 |
农作物 | 6篇 |
水产渔业 | 16篇 |
畜牧兽医 | 68篇 |
园艺 | 4篇 |
植物保护 | 13篇 |
出版年
2023年 | 6篇 |
2021年 | 10篇 |
2020年 | 14篇 |
2019年 | 10篇 |
2018年 | 5篇 |
2017年 | 9篇 |
2016年 | 7篇 |
2015年 | 8篇 |
2014年 | 16篇 |
2013年 | 19篇 |
2012年 | 21篇 |
2011年 | 15篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 17篇 |
2007年 | 14篇 |
2006年 | 9篇 |
2005年 | 13篇 |
2004年 | 7篇 |
2003年 | 10篇 |
2002年 | 8篇 |
2001年 | 9篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1995年 | 7篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1976年 | 4篇 |
1974年 | 1篇 |
1965年 | 2篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1932年 | 2篇 |
排序方式: 共有287条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
Reinbacher Lara Bacher Sven Praprotnik Eva Grabenweger Giselher 《Journal of Soils and Sediments》2021,21(6):2357-2368
Journal of Soils and Sediments - The successful implementation of a plant protection product depends on its effectiveness against a target species and its safety for the environment. Risk... 相似文献
56.
ABSTRACT Fusarium fungi, including F. culmorum, cause seedling blight, foot rot, and head blight diseases of cereals, resulting in yield loss. In a screen for potential disease control organisms and agents, Pseudomonas fluorescens strains MKB 100 and MKB 249, P. frederiksbergensis strain 202, Pseudomonas sp. strain MKB 158, and chitosan all significantly reduced the extent of both wheat coleoptile growth retardation and wheat and barley seedling blight caused by F. culmorum (by 53 to 91%). Trichodiene synthase is a Fusarium enzyme necessary for trichothecene mycotoxin biosynthesis; expression of the gene encoding this enzyme in wheat was 33% lower in stem base tissue coinoculated with Pseudomonas sp. strain MKB 158 and F. culmorum than in wheat treated with bacterial culture medium and F. culmorum. When wheat and barley were grown in soil amended with either chitosan, P. fluorescens strain MKB 249, Pseudomonas sp. strain MKB 158, or culture filtrates of these bacteria, the level of disease symptoms on F. culmorum-inoculated stem base tissue (at 12 days post- F. culmorum inoculation) was >/=31% less than the level on F. culmorum-inoculated plants grown in culture medium-amended soil. It seems likely that at least part of the biocontrol activity of these bacteria and chitosan may be due to the induction of systemic disease resistance in host plants. Also, in coinoculation studies, Pseudomonas sp. strain MKB 158 induced the expression of a wheat class III plant peroxidase gene (a pathogenesis-related gene). 相似文献
57.
Evaluation of the in vitro efficacy of hemodialysis,hemoperfusion, and the combined approach on the removal of metaldehyde from canine plasma 下载免费PDF全文
58.
Sven Gjedde Sommer Erik Steen Jensen Jan Kofoed Schj⊘rring 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(1):21-24
Abstract Absorption of volatilized ammonia after application of slurry onto the soil surface (sand) between rows of a wheat crop was studied in two experiments. The slurry was labelled with 15N-NH4. During seven days the accumulated gaseous N loss from the slurry varied from 6.9 to 11.1 g N m?2. In April ammonia losses from slurry applied beneath a 5 cm high wheat crop were equal to losses from slurry applied to a fallow, but 2.2% of the lost atmospheric ammonia was taken up by the leaves. In May ammonia loss from slurry applied between the rows of a 43 cm high crop was reduced by 6% compared to the loss from fallow, because of a reduced transfer of ammonia from the slurry to the air. Of the emitted ammonia 3.3% was absorbed by the canopy. 相似文献
59.
Johan Stendahl Sven Snll Mats T. Olsson Peter Holmgren 《Forest Ecology and Management》2002,170(1-3):75-88
The relationship between soil properties and forest site quality was investigated. The site quality functions currently used fail in predicting variations within regions and the purpose of this study was to evaluate if the local accuracy in forest resource assessments could benefit from the use of geological and geochemical data. The investigation was conducted in mid-Sweden within two geological regions. The mineralogy of the parent material (C horizon) was estimated using a method for normative mineralogical assessment and the soil chemistry was determined for five soil horizons. The importance of individual minerals for site quality was different within the two geological regions. Functional relations were established between the properties in different soil horizons and site index. The functions between mineralogy and site index were improved by splitting the data according to the geologically different regions. The mineralogy explained 37–61% of the variation in site index, whereas the properties in the upper soil profile (O–B horizon) related more strongly to site index (18–80%). Stronger relations could be established in the mineralogically rich than in the mineralogically poor area. 相似文献
60.
Dornez E Gebruers K Cuyvers S Delcour JA Courtin CM 《Journal of agricultural and food chemistry》2007,55(17):7149-7155
The impact of varying levels of endoxylanase activity in wheat flour on arabinoxylan (AX) in mixed and rested dough was studied using eight industrially milled wheat flour fractions with varying endoxylanase activity levels. Analysis of the levels of reducing end xylose (RX) and solubilized AX (S-AX) formed during mixing and resting and their correlation with the endoxylanase activity in the flour milling fractions showed that solubilization of AX during the mixing phase is mainly due to mechanical forces, while solubilization of AX during resting is caused by endoxylanase activity. Moreover, solubilization of AX during the dough resting phase is more outspoken than that during the mixing phase. Besides endoxylanase activity, there were significant xylosidase and arabinofuranosidase activities during the dough resting phase. The results indicate that wheat flour-associated endoxylanases can alter part of the AX in dough, thereby changing their functionality in bread making and potentially affecting dough and end product properties. 相似文献