全文获取类型
收费全文 | 8648篇 |
免费 | 540篇 |
国内免费 | 778篇 |
专业分类
林业 | 211篇 |
农学 | 576篇 |
基础科学 | 1110篇 |
1578篇 | |
综合类 | 5558篇 |
农作物 | 252篇 |
水产渔业 | 95篇 |
畜牧兽医 | 193篇 |
园艺 | 110篇 |
植物保护 | 283篇 |
出版年
2024年 | 65篇 |
2023年 | 192篇 |
2022年 | 226篇 |
2021年 | 209篇 |
2020年 | 240篇 |
2019年 | 269篇 |
2018年 | 161篇 |
2017年 | 249篇 |
2016年 | 341篇 |
2015年 | 336篇 |
2014年 | 521篇 |
2013年 | 548篇 |
2012年 | 777篇 |
2011年 | 850篇 |
2010年 | 623篇 |
2009年 | 537篇 |
2008年 | 501篇 |
2007年 | 617篇 |
2006年 | 528篇 |
2005年 | 472篇 |
2004年 | 326篇 |
2003年 | 284篇 |
2002年 | 206篇 |
2001年 | 185篇 |
2000年 | 182篇 |
1999年 | 127篇 |
1998年 | 81篇 |
1997年 | 76篇 |
1996年 | 39篇 |
1995年 | 46篇 |
1994年 | 28篇 |
1993年 | 36篇 |
1992年 | 15篇 |
1991年 | 19篇 |
1990年 | 19篇 |
1989年 | 13篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1985年 | 2篇 |
排序方式: 共有9966条查询结果,搜索用时 15 毫秒
31.
美国农业保护性耕作技术的启示 总被引:1,自引:0,他引:1
为了学习与引进先进的保护性耕作技术,阐述了美国保护性耕作的起源,说明了传统耕作给农业生产带来的毁灭性的打击,并通过以免耕为主的保护性耕作的论述,进一步说明了黑龙江省耕作制度改革的必要性。同时通过美国先进耕作制度的论述,提出了黑龙江省发展保护性耕作制度的必要性和具体措施。 相似文献
32.
根据农业院校高等数学教学体会进行了系统总结和思考,并对当前农业院校高等数学教学遇到的问题提出了改进建议。 相似文献
33.
2015年越来越多的行业运用"互联网+"为行业创造更多的价值,笔者基于休闲观光农业的现状,从服务形式、游客参与度、营销方式、文化内涵、评价体系方面分析了休闲观光农业行业发展和营销推广中存在的问题,提出利用"互联网+"的技术和手段解决这些问题的方法和措施。 相似文献
34.
35.
36.
Can additional N fertiliser ameliorate the elevated CO2‐induced depression in grain and tissue N concentrations of wheat on a high soil N background?
下载免费PDF全文
![点击此处可从《Journal of Agronomy and Crop Science》网站下载免费的PDF全文](/ch/ext_images/free.gif)
M. Tausz R. M. Norton S. Tausz‐Posch M. Löw S. Seneweera G. O'Leary R. Armstrong G. J. Fitzgerald 《Journal of Agronomy and Crop Science》2017,203(6):574-583
Elevated CO2 stimulates crop yields but leads to lower tissue and grain nitrogen concentrations [N], raising concerns about grain quality in cereals. To test whether N fertiliser application above optimum growth requirements can alleviate the decline in tissue [N], wheat was grown in a Free Air CO2 Enrichment facility in a low‐rainfall cropping system on high soil N. Crops were grown with and without addition of 50–60 kg N/ha in 12 growing environments created by supplemental irrigation and two sowing dates over 3 years. Elevated CO2 increased yield and biomass (on average by 25%) and decreased biomass [N] (3%–9%) and grain [N] (5%). Nitrogen uptake was greater (20%) in crops grown under elevated CO2. Additional N supply had no effect on yield and biomass, confirming high soil N. Small increases in [N] with N addition were insufficient to offset declines in grain [N] under elevated CO2. Instead, N application increased the [N] in straw and decreased N harvest index. The results suggest that conventional addition of N does not mitigate grain [N] depression under elevated CO2, and lend support to hypotheses that link decreases in crop [N] with biochemical limitations rather than N supply. 相似文献
37.
Nutrient availability and corn growth in a poultry litter biochar‐amended loam soil in a greenhouse experiment
下载免费PDF全文
![点击此处可从《Soil Use and Management》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Nutrient‐rich biochar produced from animal wastes, such as poultry litter, may increase plant growth and nutrient uptake although the role of direct and indirect mechanisms, such as stimulation of the activity of mycorrhizal fungi and plant infection, remains unclear. The effects of poultry litter biochar in combination with fertilizer on mycorrhizal infection, soil nutrient availability and corn (Zea mays L.) growth were investigated by growing corn in a loam soil in a greenhouse with biochar (0, 5 and 10 Mg/ha) and nitrogen (N) and phosphorus (P) fertilizer (0, half and full rates). Biochar did not affect microbial biomass C or N, mycorrhizal infection, or alkaline phosphomonoesterase activities, but acid phosphomonoesterase activities, water‐soluble P, Mehlich‐3 Mg, plant height, aboveground and root biomass, and root diameter were greater with 10 Mg/ha than with no biochar. Root length, volume, root tips and surface area were greatest in the fully fertilized soil receiving 10 Mg/ha biochar compared to all other treatments. The 10 Mg/ha biochar application may have improved plant access to soil nutrients by promoting plant growth and root structural features, rather than by enhancing mycorrhizal infection rates. 相似文献
38.
39.
Drought Tolerance and Water Use of Cereal Crops: A Focus on Sorghum as a Food Security Crop in Sub‐Saharan Africa
下载免费PDF全文
![点击此处可从《Journal of Agronomy and Crop Science》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Sub‐Saharan Africa (SSA) faces twin challenges of water stress and food insecurity – challenges that are already pressing and are projected to grow. Sub‐Saharan Africa comprises 43 % arid and semi‐arid area, which is projected to increase due to climate change. Small‐scale, rainfed agriculture is the main livelihood source in arid and semi‐arid areas of SSA. Because rainfed agriculture constitutes more than 95 % of agricultural land use, water scarcity is a major limitation to production. Crop production, specifically staple cereal crop production, will have to adapt to water scarcity and improved water productivity (output per water input) to meet food requirements. We propose inclusion and promotion of drought‐tolerant cereal crops in arid and semi‐arid agro‐ecological zones of SSA where water scarcity is a major limitation to cereal production. Sorghum uniquely fits production in such regions, due to high and stable water‐use efficiency, drought and heat tolerance, high germplasm variability, comparative nutritional value and existing food value chain in SSA. However, sorghum is socio‐economically and geographically underutilized in parts of SSA. Sorghum inclusion and/or promotion in arid and semi‐arid areas of SSA, especially among subsistence farmers, will improve water productivity and food security. 相似文献
40.