全文获取类型
收费全文 | 469篇 |
免费 | 7篇 |
国内免费 | 10篇 |
专业分类
林业 | 67篇 |
农学 | 17篇 |
基础科学 | 2篇 |
26篇 | |
综合类 | 284篇 |
农作物 | 21篇 |
水产渔业 | 4篇 |
畜牧兽医 | 25篇 |
园艺 | 37篇 |
植物保护 | 3篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 3篇 |
2021年 | 7篇 |
2020年 | 9篇 |
2019年 | 15篇 |
2018年 | 3篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2015年 | 23篇 |
2014年 | 23篇 |
2013年 | 25篇 |
2012年 | 42篇 |
2011年 | 54篇 |
2010年 | 37篇 |
2009年 | 53篇 |
2008年 | 43篇 |
2007年 | 40篇 |
2006年 | 23篇 |
2005年 | 11篇 |
2004年 | 11篇 |
2003年 | 8篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1985年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有486条查询结果,搜索用时 10 毫秒
101.
Kambiz Baghalian Ali Haghiry Mohammad Reza Naghavi Abodollah Mohammadi 《Scientia Horticulturae》2008,116(4):437-441
In arid and semi-arid regions, where water availability is a major limitation in crop production, using alternative water resources, such as saline water is one way to utilize lands. Chamomile (Matricaria recutita L.) as an annual medicinal herb may be considered as an economic substitute for field crops irrigated with fresh water since it has adaptability to wide range of climate and soil. A field examination was conducted during 2004–2005 using complete randomized block design with four replications in order to evaluate the effects of saline irrigation water on morphological characters, mineral content, oil quantity (content, yield), oil composition and apigenin content of chamomile. In each plot, 0.6 g/m2 of seeds were grown in 4 rows. The irrigation water had five different salinity levels (0, 4, 8, 12 and 16 dS m−1). The investigated characters through cultivation were fresh weight of flower (g), dry weight of flower (g), dry weight of aerial stems (g), dry weight of root (g), oil yield (kg/h), oil content (%), oil quality and apigenin content (%). After harvesting, the content of minerals (Na+, Cl−, K+, Ca2+, Mg2+) were evaluated in aerial parts and roots of each plot. Mean comparisons for fresh flower weight in different treatments showed that fresh flower yield decreased with increasing salinity and it was higher in control compared to others. Analysis of variance showed that saline irrigation water had no significant effect on oil quantity (yield and content), oil quality (chemical composition) or apigenin content. Our results showed that chamomile is able to maintain all its medical properties, under saline condition and could be cultivated economically in such conditions. 相似文献
102.
对浙江风阳山自然保护区药用藓类植物资源进行了初步调查研究,结果表明:风阳山自然保护区共有药用藓类植物17种,隶属11科13属,约占全国药用苔藓植物总数的29%,并对保护区药用藓类植物的生境及药用功效作了初步分析,提出了合理性开发利用的思路。 相似文献
103.
104.
Allelopathic behaviour of three medicinal herbs viz. Rheum emodi, Saussaurea lappa and Potentilla fulgens, on some traditional food crops was examined. Germination of all the traditional food crops was reduced significantly under
aqueous extracts of S. lappa and P. fulgens but radicle and plumule growth of Amaranthus
caudatus and Eleusine coracana was reduced significantly under aqueous extracts of all three medicinal species. For marginal farmers sole medicinal plants
cultivation is not possible, therefore, medicinal plants based agroforestry is being propagated. 相似文献
105.
Sixty-six folk medicinal plants from E∂irdir (Turkey) are reported. Among them 56 species are wild and 10 species are cultivated plants. They are mostly used for kidney stones, ulcer, hemorrhoids, rheumatism, cold and as analgesic, diuretic and carminative. 相似文献
106.
海巴戟天的栽培及其利用 总被引:6,自引:0,他引:6
介绍了药用植物海巴戟天的自然分布、形态特征、栽培管理和病虫害的防治技术,报道了海巴戟天的 药用历史和现代医学研究结果以及产品开发现状,提出种植开发利用建议。 相似文献
107.
108.
109.
110.