全文获取类型
收费全文 | 3285篇 |
免费 | 138篇 |
国内免费 | 3篇 |
专业分类
林业 | 236篇 |
农学 | 463篇 |
基础科学 | 87篇 |
851篇 | |
综合类 | 83篇 |
农作物 | 271篇 |
水产渔业 | 70篇 |
畜牧兽医 | 983篇 |
园艺 | 98篇 |
植物保护 | 284篇 |
出版年
2023年 | 23篇 |
2022年 | 38篇 |
2021年 | 51篇 |
2020年 | 86篇 |
2019年 | 87篇 |
2018年 | 119篇 |
2017年 | 136篇 |
2016年 | 108篇 |
2015年 | 83篇 |
2014年 | 94篇 |
2013年 | 296篇 |
2012年 | 140篇 |
2011年 | 157篇 |
2010年 | 125篇 |
2009年 | 113篇 |
2008年 | 112篇 |
2007年 | 138篇 |
2006年 | 143篇 |
2005年 | 110篇 |
2004年 | 71篇 |
2003年 | 77篇 |
2002年 | 72篇 |
2001年 | 57篇 |
2000年 | 51篇 |
1999年 | 53篇 |
1998年 | 41篇 |
1997年 | 43篇 |
1996年 | 34篇 |
1995年 | 34篇 |
1994年 | 29篇 |
1993年 | 28篇 |
1992年 | 30篇 |
1991年 | 36篇 |
1990年 | 31篇 |
1989年 | 38篇 |
1988年 | 45篇 |
1987年 | 34篇 |
1986年 | 29篇 |
1985年 | 24篇 |
1984年 | 25篇 |
1983年 | 26篇 |
1982年 | 22篇 |
1980年 | 34篇 |
1979年 | 37篇 |
1978年 | 20篇 |
1976年 | 20篇 |
1971年 | 20篇 |
1970年 | 37篇 |
1969年 | 24篇 |
1968年 | 23篇 |
排序方式: 共有3426条查询结果,搜索用时 0 毫秒
161.
Effect of Temperature on Bio-Kinetic Coefficients in UASB Treatment of Municipal Wastewater 总被引:1,自引:0,他引:1
Upflow anaerobic sludge blanket (UASB)reactors were used to treat municipal wastewater attemperatures of 6, 11, 15, 20 and 32 °C and athydraulic retention times (HRTs) ranging from 48 to 3 h overan operational period of approximately 860 days. The Monodmodel was used to evaluate substrate utilization. TheArrhenius model was used to calculate the activationenergies from which temperature coefficients weredetermined. It was found that the maximum specific substrateutilization rate constant (k) decreased from 0.387 d-1(at 32 °C) to 0.041 d-1 (at 6 °C). Thedecay rate constant (kd), yield coefficient (Yg),half velocity constant (Ks) and maximum specific growthrate (μm ) were also impacted by temperature in theUASB treatment of municipal wastewater. 相似文献
162.
Anjana Srivastava Kailash Singh Rawat Santosh Chandra Bhatt Deepa Rawat Prakash Chandra Srivastava 《Communications in Soil Science and Plant Analysis》2016,47(17):1961-1966
The aim of the study was to evaluate the degradation and persistence of 2-amino 4-chloro 6-methyl pyrimidine (AM), nitrification inhibitor at 1 and 2 µg g?1 application rates in soil. The extraction of AM was done by QuEChER’s (Quick, Easy. Cheap. Rugged and Safe) method and the quantitative analysis by high-performance liquid chromatography (HPLC). AM decreased with time at both the levels of application with the decline being faster in the beginning up to 7 d. Dissipation of AM occurred in a single phase with the persistence data fitting well to the first-order kinetics. Half-lives of AM were determined to be 14.33 and 16.7 d at 1 and 2 µg g–1 levels application rates. Since AM remains effective for an adequate period of time, it can be used for increasing efficiency of nitrogenous fertilizers in rice–wheat cropping systems as well as a safeguard for controlling environmental pollution in subtropical soils. 相似文献
163.
G. Girmay B. R. Singh H. Mitiku T. Borresen R. Lal 《Land Degradation \u0026amp; Development》2008,19(4):351-367
The effect of soil management and land use change are of interest to the sustainable land management for improving the environment and advancing food security in developing countries. Both anthropogenic changes and natural processes affect agriculture primarily by altering soil quality. This paper reviews and synthesizes the available literatures related to the influence of soil management and land use changes on soil carbon (C) stock in Ethiopia. The review shows that topsoil C stock declines approximately 0–63%, 0–23%, and 17–83% upon land use conversion from forest to crop land, to open grazing, and to plantation, respectively. An increase of 1–3% in soil C stock was observed within 10 years of converting open grazed land to protected enclosures. However, there was a little change in soil C stock below 20 cm depth. There is a large potential of increasing SOC pool with adoption of land restorative measures. Total potential of soil C sequestration with the adoption of restoration measures ranges 0·066–2·2 Tg C y−1 on rain‐fed cropland and 4·2–10·5 Tg C y−1 on rangeland. Given large area and diverse ecological conditions in Ethiopia, research data available in published literature are rather scanty. Therefore, researchable priorities identified in this review are important. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
164.
Tolerance to zinc (Zn) deficiency was examined for three wheat (Triticum aestivum L.) and three barley (Hordeum vulgare L.) varieties grown in chelator‐buffered nutrient solution. Four indices were chosen to characterize tolerance to Zn deficiency: (1) relative shoot weight at low compared to high Zn supply (“Zn efficiency index”), (2) relative shoot to root ratio at low compared to high Zn supply, (3) total shoot uptake of Zn under deficient conditions, and (4) shoot dry weight under deficient conditions. Barley and wheat exhibited different tolerance to Zn deficiency, with barley being consistently more tolerant than wheat as assessed by all four indices. The tolerance to Zn deficiency in the barley varieties was in the order Thule=Tyra>Kinnan, and that of wheat in the order Bastian=Avle>Vinjett. The less tolerant varieties of both species accumulated more P in the shoots than the more tolerant varieties. For all varieties, the concentrations of Mn, Fe, Cu, and P in shoot tissue were negatively correlated with Zn supply. This antagonism was more pronounced for Mn and P than for Cu and Fe. Accumulation of Cu in barley roots was extremely high under Zn‐deficient conditions, an effect not so clearly indicated in wheat. 相似文献
165.
Kapildeo N. Singh Rashmi Nandi P. Shanmugasundram S. Sadasivam Ning Huang D.S. Brar G.S. Khush 《Genetic Resources and Crop Evolution》1999,46(5):427-433
To assess diversification of indica rice, fingerprinting of 42 Indian rice varieties (Oryza sativa L) and one accession of O. brachyantha Chev. et Roehr. was taken up using amplified fragment length polymorphism (AFLP). Six primer combinations of PstI and MseI were used for this purpose. On denaturing polyacrylamide sequencing gel, on average 41 scorable AFLP bands were obtained of which 81% were polymorphic. Each variety revealed a distinct fingerprint. Data were scored on the basis of presence and absence of bands and cluster analysis was performed using Dice similarity coefficients. The resultant dendrogram showed four major clusters and traits. Some varieties especially landraces revealed more polymorphism and unique loci. Such study will be a valuable tool for proper choice of parents in mapping populations or breeding programs to produce heterotic several inexplicable minor clusters. Some varieties were grouped according to parentages of the cross while some were grouped according to physiological combinations apart from providing a characteristic fingerprint. 相似文献
166.
Influence of orthopedic reinforced gloves versus double standard gloves on contamination events during small animal orthopedic surgery
下载免费PDF全文
![点击此处可从《Veterinary surgery : VS》网站下载免费的PDF全文](/ch/ext_images/free.gif)
167.
The importance of reduced tillage in sustainable agriculture is well recognized. Reduced-tillage practices (which may or may
not involve retention of crop residues) and their effects differ from those of conventional tillage in several ways: soil
physical properties; shifts in host–weed competition; soil moisture availability (especially when sowing deeply or under stubble);
and the emergence of pathogen populations that survive on crop residues. There may be a need for genotypes suited to special
forms of mechanization (e.g. direct seeding into residues) and to agronomic conditions such as allelopathy, as well as specific
issues relating to problem soils. This article examines issues and breeding targets for researchers who seek to improve crops
for reduced-tillage systems. Most of the examples used pertain to wheat, but we also refer to other crops. Our primary claim
is that new breeding initiatives are needed to introgress favourable traits into wheat and other crops in areas where reduced
or zero-tillage is being adopted. Key traits include faster emergence, faster decomposition, and the ability to germinate
when deep seeded (so that crops compete with weeds and use available moisture more efficiently). Enhancement of resistance
to new pathogens and insect pests surviving on crop residues must also be given attention. In addition to focusing on new
traits, breeders need to assess germplasm and breeding populations under reduced tillage. Farmer participatory approaches
can also enhance the effectiveness of cultivar development and selection in environments where farmers’ links with technology
providers are weak. Finally, modern breeding tools may also play a substantial role in future efforts to develop adapted crop
genotypes for reduced tillage. 相似文献
168.
Tea (Camellia sinensis) clones with shorter periods of winter dormancy exhibit lower accumulation of reactive oxygen species 总被引:1,自引:0,他引:1
Tea (Camellia sinensis (L.) O. Kuntze) is a perennial crop grown throughout the world. During winter, tea undergoes a dormancy period when growth of apical buds almost ceases, severely reducing the commercial yield of tea. Low temperatures prevail during the period of winter dormancy, which alone or in combination with high solar irradiance have the potential to induce oxidative stress in plants. We studied six tea clones under field conditions to test whether a relationship exists between oxidative stress and winter dormancy. Data on the behavior of the enzymatic antioxidative system was collected for all clones during different phases of winter dormancy. There was a strong positive correlation among clones between accumulation of reactive oxygen species (ROS) and the length of the dormancy period. Clones having shorter dormancy periods exhibited higher induction of antioxidative enzymes. Results suggest that efficient scavenging of ROS is a desirable feature in tea because it leads to lower accumulations of ROS during winter months and is associated with reduced winter dormancy. 相似文献
169.
Paddy and Water Environment - The paddy straw was collected in the form of bales with three mechanical process CI (stubble shaver + rectangular baler), CII (stubble... 相似文献
170.
Seven sterols and triterpenoids have been isolated from H. ellipticum and tested for their antimicrobial activity. 相似文献