全文获取类型
收费全文 | 10261篇 |
免费 | 446篇 |
国内免费 | 885篇 |
专业分类
林业 | 1153篇 |
农学 | 759篇 |
基础科学 | 822篇 |
1441篇 | |
综合类 | 4510篇 |
农作物 | 775篇 |
水产渔业 | 564篇 |
畜牧兽医 | 862篇 |
园艺 | 452篇 |
植物保护 | 254篇 |
出版年
2024年 | 32篇 |
2023年 | 101篇 |
2022年 | 168篇 |
2021年 | 224篇 |
2020年 | 208篇 |
2019年 | 268篇 |
2018年 | 154篇 |
2017年 | 304篇 |
2016年 | 400篇 |
2015年 | 463篇 |
2014年 | 558篇 |
2013年 | 613篇 |
2012年 | 768篇 |
2011年 | 995篇 |
2010年 | 902篇 |
2009年 | 869篇 |
2008年 | 720篇 |
2007年 | 755篇 |
2006年 | 561篇 |
2005年 | 419篇 |
2004年 | 286篇 |
2003年 | 313篇 |
2002年 | 207篇 |
2001年 | 181篇 |
2000年 | 166篇 |
1999年 | 153篇 |
1998年 | 112篇 |
1997年 | 115篇 |
1996年 | 96篇 |
1995年 | 93篇 |
1994年 | 82篇 |
1993年 | 70篇 |
1992年 | 61篇 |
1991年 | 58篇 |
1990年 | 38篇 |
1989年 | 25篇 |
1988年 | 16篇 |
1987年 | 16篇 |
1986年 | 8篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1980年 | 5篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
81.
82.
Irrigation water disinfestation is an unexplored option for reducing Verticillium dahliae inoculum in water and consequently for more efficiently managing Verticillium wilts in Andalusia. We assessed Suppressive Efficacy (SE; water was infested and subsequently treated) and Preventive Efficacy (PE; previously treated water was subsequently inoculated) of OX-VIRIN®, OX-AGUA AL 25® and Deccoklor® in reducing water infestations by V. dahliae conidia. Five concentrations of each disinfestant, the lowest three being recommended by the manufacturer, were tested in vitro against six V. dahliae isolates. Validation assays were carried out in experiments under natural environmental conditions in spring. The four highest concentrations of OX-VIRIN® (0.8–51.2 mL L−1), the three highest of OX-AGUA AL 25® (46.4–417.5 μL L−1) and the two highest of Deccoklor® (0.375 and 3.75 mL L−1), showed an in vitro-efficacy (SE and PE) of 96.2, 80.0 and 100.0% after 30, 5 to 30 and 15 days respectively. Therefore, recommended concentrations for OX-VIRIN® and OX-AGUA AL 25® showed a greater in vitro-effectiveness than those recommended for Deccoklor®. Assays in natural environmental conditions proved that OX-VIRIN® at the recommended concentration of 3.2-mL L−1, applied every 28 days to water, was the most effective treatment (SE and PE), with a 100% reduction of the average relative viability after 56 days. Other chemical treatments showing high in vitro-efficacy, such as OX-VIRIN® at 0.8 mL L−1 and OX-AGUA AL 25® at 46.4 μL L−1 showed an SE of 99.9% after 14 and 28 days when applied every 28 and 14 days, respectively. However, PE of OX-AGUA AL 25® at 46.4 μL L−1 was only 59 and 38% after 28 and 14 days respectively, depending on the experiment. 相似文献
83.
84.
85.
钱玉光 《农业图书情报学刊》2011,23(5):183-185
通过问卷调查方式对苏北连云港地区灌云县农村小学生的阅读状况、阅读需求和服务进行专题调研,并对相关数据进行统计分析,试图从中探究农村小学生阅读的共性特征和存在的问题,为农村青少年阅读活动的进一步开展提供参考依据。 相似文献
86.
Said Ennahli Sorkel Kadir Houchang Khatamian David Scurlock Hafida Hanine 《International Journal of Fruit Science》2017,17(1):1-19
Simultaneous responses of American (Concord), European (Pinot Noir), and American-European hybrid (Traminette) cultivars to seasonal and diurnal variation in field environmental conditions were assessed to propose suitable cultivars for potential use for selection and breeding in grapevines in dry areas. ‘Pinot Noir’ had higher gas exchange parameters, higher water potential, and chlorophyll fluorescence, while ‘Concord’ had the lowest values in all three seasons and experienced moderate stress by the end of each season. The dry conditions in 2005 caused water potential to decline sharply compared to values recorded in 2004 and 2006. ‘Pinot Noir’ and ‘Traminette’ exhibited a mild stress, while ‘Concord’ exhibited a moderate stress in 2006. Photosynthetic rate decreased slightly during the summer with a slight recovery at the beginning of September, and did not differ across the seasons among cultivars. Stomatal conductance followed the same pattern. However, in both 2004 and 2005, stomatal conductance dropped sharply late in the season because of frequently occurring high temperatures that were greater than 32 °C. Maximum morning values of Fv/Fm were within the optimal range. The study suggests the presence of marginal photoinhibition during mid-summer in Concord cultivars, because no full recovery of photochemical efficiency early in the evening was observed. The European cultivar (Pinot Noir) and the American-European hybrid (Traminette) are more adapted to field conditions in Kansas than Concord cultivars. However, high cold-mortality of Pinot Noir due to high sensitivity to cold winter temperature makes the hybrid cultivars the most suitable cultivar for Midwest regions with relatively cold winters. 相似文献
87.
江西农业大学园林专业创新人才培养现状调研 总被引:6,自引:5,他引:1
结合多年的教学实践,以园林行业人才需求特点及江西农业大学当前教学现状为出发点,分别从专业课程体系设计的科学性、课程间安排的合理性、教学内容的与时俱进性、教学方式方法的先进性、教学效果、教学管理的协合性、就业与考试状况等7方面进行了问试和访谈调查,结果表明,江西农业大学在园林专业创新人才培养方面主要存在以下问题:教学管理模式与理念创新不够,课程安排欠合理,实践教学实效性不高,专业特色不显著,就业期望值偏高,教学模式与考核体系陈旧,教学内容缺乏更新。 相似文献
88.
为了探寻影响油茶高接换冠后枯桩的相关因素,为今后油茶高接换冠技术改良提供理论依据,调查研究了嫁接方法、接穗品种、砧木粗度、留截高度和嫁接方位等因素对油茶高接换冠后枯桩现象的影响。结果表明:5种因素对油茶枯桩程度影响极显著。其中,采用插皮腹接、砧木直径2~6 cm枯桩程度最低;采用‘华硕’和‘湘林XLJ14’其枯桩程度显著低于其它品种;留截高度越低枯桩程度越低;嫁接方位在外侧枯桩程度最低。偏相关分析结果表明,留截高度对油茶枯桩程度的影响最大;其次是嫁接方法、砧木直径和嫁接品种;而嫁接方位对油茶枯桩程度的影响最小。 相似文献
89.
Incubation success and habitat selection of shore‐spawning kokanee Oncorhynchus nerka: effects of water‐level regulation and habitat characteristics 下载免费PDF全文
Changes to water‐level regimes have been known to restructure fish assemblages and interfere with the population dynamics of both littoral and pelagic species. The effect of altered water‐level regimes on shore‐spawning kokanee Oncorhynchus nerka incubation success was evaluated using a comprehensive in situ study in Lake Pend Oreille, ID, USA. Survival was not related to substrate size composition or depth, indicating that shore‐spawning kokanee do not currently receive a substrate‐mediated survival benefit from higher winter water levels. Substrate composition also did not differ among isobaths in the nearshore area. On average, the odds of an egg surviving to the preemergent stage were more than three times greater for sites in downwelling areas than those lacking downwelling. This study revealed that shoreline spawning habitat is not as limited as previously thought. Downwelling areas appear to contribute substantially to shore‐spawning kokanee recruitment. This research illustrates the value of rigorous in situ studies both for testing potential mechanisms underlying population trends and providing insight into spawning habitat selection. 相似文献
90.