全文获取类型
收费全文 | 20160篇 |
免费 | 1143篇 |
国内免费 | 998篇 |
专业分类
林业 | 3389篇 |
农学 | 1850篇 |
基础科学 | 556篇 |
2492篇 | |
综合类 | 8444篇 |
农作物 | 1324篇 |
水产渔业 | 259篇 |
畜牧兽医 | 1240篇 |
园艺 | 953篇 |
植物保护 | 1794篇 |
出版年
2024年 | 49篇 |
2023年 | 292篇 |
2022年 | 482篇 |
2021年 | 575篇 |
2020年 | 623篇 |
2019年 | 687篇 |
2018年 | 506篇 |
2017年 | 738篇 |
2016年 | 889篇 |
2015年 | 670篇 |
2014年 | 902篇 |
2013年 | 1299篇 |
2012年 | 1685篇 |
2011年 | 1381篇 |
2010年 | 1169篇 |
2009年 | 1290篇 |
2008年 | 1166篇 |
2007年 | 1262篇 |
2006年 | 1048篇 |
2005年 | 868篇 |
2004年 | 740篇 |
2003年 | 561篇 |
2002年 | 456篇 |
2001年 | 403篇 |
2000年 | 356篇 |
1999年 | 290篇 |
1998年 | 246篇 |
1997年 | 201篇 |
1996年 | 180篇 |
1995年 | 211篇 |
1994年 | 172篇 |
1993年 | 159篇 |
1992年 | 148篇 |
1991年 | 146篇 |
1990年 | 132篇 |
1989年 | 95篇 |
1988年 | 71篇 |
1987年 | 58篇 |
1986年 | 31篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1955年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
AbstractThe effect of different rice-based crop rotation sequences on the population densities of Meloidogyne graminicola and on the yield of rice was evaluated in a microplot experiment under lowland rice field conditions. Ten treatments of cropping sequences were grown in four successive growing seasons: continuous growing of the susceptible rice cultivar Thihtatyin (rice-rice-rice-rice), four treatments of 1- season crop rotation sequences (rice-rice-chickpea-rice, rice-rice-black gram-rice, rice-rice-soybean-rice, rice-rice-cowpea-rice), and five treatments of 2-season crop rotation sequences (groundnut-rice-chickpea-rice, green gram-rice-black gram-rice, cowpea-rice-soybean-rice, sesame-rice-cowpea-rice, sunflower-rice-sesame-rice). Population densities of M. graminicola recovered from the rice plants and the nematode multiplication factors (Mf) in the soil in the continuous rice cropping sequence (rice-rice-rice-rice) was the highest among the ten cropping sequences. Lowest nematode Mf in the soil was observed in the 2-season crop rotation sequence sunflower-rice-sesame-rice and the highest was observed in the 1-season crop rotation sequence rice-rice-cowpea-rice among the nine crop rotation sequences. Highest rice yield was obtained in the 2-season crop rotation sequences green gram-rice-black gram-rice, sesame-rice-cowpea-rice and sunflower-rice-sesame-rice, which were about 2 times higher compared with the 1-season crop rotation sequences and about 3 times higher compared with the continuous rice cropping sequence. 相似文献
82.
83.
84.
85.
Daniele Grifoni Marco Napoli Francesco Sabatini Simone Orlandini Marco Mancini Gaetano Zipoli Anna Dalla Marta 《Journal of Agronomy and Crop Science》2019,205(4):422-432
A UV exclusion experiment was conducted on durum wheat (Triticum durum Desf. var. Claudio) grown in pots. Plants were grown under three different radiative treatments in greenhouses covered with plastic filters: Teflon, transparent to the entire region of natural UV‐visible sunlight (TEF); polyester, transparent above 312 nm (MYL, excluding UVB) and Lee, transparent above 400 nm (LEE, excluding both UVA and UVB). Analyses have been carried out to determine the concentration of photosynthetic pigments in leaves, UV‐absorbing compounds, nitrogen and carbon in leaves, culms and spikes and proteins and gluten in grains. In particular, plants grown under UV exclusion showed a reduction in protein and dry gluten content (consequently without variation in the ratio dry gluten/protein), but at the same time, a significant increase of gluten index, which is a parameter to define the quality of gluten, was observed. The results highlighted the influence played by UV radiation on some biochemical parameters, mainly UV‐absorbing compounds, leaf nitrogen and grain protein characteristics of durum wheat cultivated under Mediterranean conditions. In particular, natural level of UV in the Mediterranean improves the characteristics of durum wheat flour important for pasta production (high dry gluten level), while the UV exclusion could improve characteristics of flour important for bread production (high gluten index). 相似文献
86.
勐海县种茶、制茶、用茶历史悠久,古茶树资源丰富,但近年来随着古茶树茶叶价格不断攀升,古茶树死亡和树势衰退现象变得多发。笔者认为造成勐海县古茶树的死亡原因主要有古茶树生境遭受破坏,管理不规范,私下流转现象严重、造成林权管理和服务不到位,没有规范操作规程、导致采摘过度,茶园土壤营养缺乏等;提出修复古茶树生境,加强古茶树科学研究,细化古茶园管养技术措施、制定管理规程,运用测土配方施肥技术、改善土壤养分结构,加大水肥管理和病虫害防控知识宣传力度等实现古茶树资源可持续经营的对策。 相似文献
87.
Hillary Righini Ornella Francioso Michele Di Foggia Antera Martel Quintana Roberta Roberti 《Marine drugs》2020,18(12)
Phycobiliproteins (PBPs) are proteins of cyanobacteria and some algae such as rhodophytes. They have antimicrobial, antiviral, antitumor, antioxidative, and anti-inflammatory activity at the human level, but there is a lack of knowledge on their antifungal activity against plant pathogens. We studied the activity of PBPs extracted from Arthrospira platensis and Hydropuntia cornea against Botrytis cinerea, one of the most important worldwide plant-pathogenic fungi. PBPs were characterized by using FT-IR and FT-Raman in order to investigate their structures. Their spectra differed in the relative composition in the amide bands, which were particularly strong in A. platensis. PBP activity was tested on tomato fruits against gray mold disease, fungal growth, and spore germination at different concentrations (0.3, 0.6, 1.2, 2.4, and 4.8 mg/mL). Both PBPs reduced fruit gray mold disease. A linear dose–response relationship was observed for both PBPs against disease incidence and H. cornea against disease severity. Pathogen mycelial growth and spore germination were reduced significantly by both PBPs. In conclusion, PBPs have the potential for being also considered as natural compounds for the control of fungal plant pathogens in sustainable agriculture. 相似文献
88.
89.
茶树品种是茶产业发展的基础。改革开放40年来我国育成了大批的优良茶树品种,为产业发展发挥了重要作用。新《种子法》和《非主要农作物品种登记办法》要求茶树进行非主要农作物品种登记。本文介绍了非主要农作物品种登记的对象、条件、需提交材料和登记程序,重点讨论了茶树品种登记前要准备的具体材料,简单分析了2018-2019年已经完成登记的48个茶树品种的基本情况,并对未来茶树品种登记提出了3点建议。 相似文献
90.