全文获取类型
收费全文 | 563篇 |
免费 | 19篇 |
国内免费 | 1篇 |
专业分类
林业 | 32篇 |
农学 | 49篇 |
基础科学 | 7篇 |
118篇 | |
综合类 | 21篇 |
农作物 | 45篇 |
水产渔业 | 31篇 |
畜牧兽医 | 211篇 |
园艺 | 13篇 |
植物保护 | 56篇 |
出版年
2023年 | 5篇 |
2022年 | 16篇 |
2021年 | 24篇 |
2020年 | 21篇 |
2019年 | 21篇 |
2018年 | 36篇 |
2017年 | 33篇 |
2016年 | 26篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 54篇 |
2012年 | 23篇 |
2011年 | 42篇 |
2010年 | 16篇 |
2009年 | 13篇 |
2008年 | 21篇 |
2007年 | 25篇 |
2006年 | 13篇 |
2005年 | 9篇 |
2004年 | 13篇 |
2003年 | 14篇 |
2002年 | 7篇 |
2001年 | 13篇 |
2000年 | 9篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1990年 | 8篇 |
1989年 | 4篇 |
1988年 | 12篇 |
1987年 | 6篇 |
1986年 | 10篇 |
1985年 | 4篇 |
1984年 | 7篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1974年 | 2篇 |
1972年 | 4篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1965年 | 1篇 |
排序方式: 共有583条查询结果,搜索用时 15 毫秒
91.
92.
93.
BACKGROUND:Studies for nine years in southern Spain on the olive moth, Prays oleae Bern., have tested the possibility of altering oviposition behaviour on newly formed olive fruits by means of a single ethylene application. RESULTS: A single spraying of ethylene on the olive trees at the beginning of fruiting significantly decreased the olive moth egg populations and consequent the olive fruit fall. At the same time, no negative effect was found in the activity of natural oophagous predators of the olive moth. CONCLUSIONS: The ethylene treatments against P. oleae yielded substantial economical benefits each year (a mean of euro526 ha(-1)), benefits that fluctuated depending on the olive crop and on the annual fruit fall caused by this major pest. 相似文献
94.
Ibrahim Mtolera 《Communications in Soil Science and Plant Analysis》2018,49(18):2327-2337
Nutrients losses through leaching are the main problem facing coastal saline soil. Effective microorganisms (EM) and Gypsum (G) at the application rate of 5%G and 10%G by weight were used as soil amendments. The pot experiment aimed to improve the leaching of nitrate (NO3), ammonium (NH4) and total nitrogen (TN) on the coastal saline soil. The EM+ 5%G treatment effectively reduced the content of NO3 and NH4 in the leachate by 86.59% and 68.18%, respectively. EM treatment reduced the leaching of NO3 and NH4 by 70.86% and 62.12% and EM+ 10%G reduced NO3 and NH4 by 11.80% and 50.76%, respectively. Moreover, the content of TN in leachate was reduced up to 13.23%, 5.80%, and 2.67% in response to EM, EM+ 5%G, and EM+ 10%G, respectively, compared to the control. These results indicate that EM combined with G as soil amendments can reduce leaching of nutrients and further support the regulation of a coastal saline soil pH and EC. 相似文献
95.
Ashton Lim Suelee Sharifah Nur Munirah Syed Hasan Faradiella Mohd Kusin Ferdaus Mohamat Yusuff Zelina Zaiton Ibrahim 《Water, air, and soil pollution》2017,228(4):158
Phytoremediation using vetiver grass (Vetiveria zizanioides) has been regarded as an effective technique for removing contaminants in polluted water. This study was conducted to assess the removal efficiency of heavy metals (Cu, Fe, Mn, Pb, Zn) using vetiver grass (VG) at different root lengths and densities and to determine metals uptake rate by plant parts (root and shoot) between treatments (low and high concentration). Removal efficiency for heavy metals in water by VG is ranked in the order of Fe>Pb>Cu>Mn>Zn. Results showed that VG was effective in removing all the heavy metals, but removals greatly depend on root length, plant density and metal concentration. Longer root length and higher density showed greater removals of heavy metals due to increased surface area for metal absorption by plant roots. Results also demonstrated significant difference of heavy metals uptake in plant parts at different concentrations indicating that root has high tolerance towards elevated concentration of heavy metals. However, the effects were less significant in plant shoot suggesting that metals uptake were generally higher in root than in shoot. The findings have shown potential of VG in phytoremediation for heavy metals removal in water thus providing significant implication for treatment of metal-contaminated water. 相似文献
96.
Imanurfatiehah?Ibrahim Anis?Salwa?Mohd?KhairuddinEmail author Mohamad?Sofian?Abu Talip Hamzah?Arof Rubiyah?Yusof 《Wood Science and Technology》2017,51(2):431-444
An automated wood texture recognition system of 48 tropical wood species is presented. For each wood species, 100 macroscopic texture images are captured from different timber logs where 70 images are used for training while 30 images are used for testing. In this work, a fuzzy pre-classifier is used to complement a set of support vector machines (SVM) to manage the large wood database and classify the wood species efficiently. Given a test image, a set of texture pore features is extracted from the image and used as inputs to a fuzzy pre-classifier which assigns it to one of the four broad categories. Then, another set of texture features is extracted from the image and used with the SVM dedicated to the selected category to further classify the test image to a particular wood species. The advantage of dividing the database into four smaller databases is that when a new wood species is added into the system, only the SVM classifier of one of the four databases needs to be retrained instead of those of the entire database. This shortens the training time and emulates the experts’ reasoning when expanding the wood database. The results show that the proposed model is more robust as the size of wood database is increased. 相似文献
97.
Abdelmalik I. Khalafalla Marzook M. Al Eknah Mahmoud Abdelaziz Ibrahim M. Ghoneim 《Tropical animal health and production》2017,49(5):967-974
Dromedary camels complaining from conception failure or abortion were investigated and their herders interviewed in Al Ahsa province, Kingdom of Saudi Arabia (KSA) during 2013 and 2015. The most important reproductive disorder according to the responders is uterine infection (60.2%) followed by obesity (22.3%) then physiological conditions (hormonal disturbances; 7.8%), adhesions (3.9%) and repeat breeders (2.9%). Of the camel herders, 78.6% reported previous occurrence of abortion in their herds and 46% reported abortion cases in the last season (2015/2016), while 21.4% reported no history of abortion. Most of the responders (97.1%) do not call a veterinarian for cases of abortion in their herds and 53.4% do not discard aborted materials. The majority of the herders (76.7%) deny that handling aborted materials or touching vaginal fluids can result in human infection, or replied they do not know. Uterine swab samples were collected and tested by PCR for seven potential pathogens and sera tested for antibodies against bovine viral diarrhea virus (BVDV) and Brucella. Five pathogens were identified in infected uterine samples, namely Coxiella burnetii (36%), Campylobacter spp. (27%), Brucella spp. (17%), Salmonella spp. (13%), and Chlamydia spp. (7%). Sero-prevalence of Brucella and BVDV was 8.2 and 29.1% in overall sera, respectively, and varies with regard to the region. The findings of the present study demonstrate that reproductive disorders dominated by uterine infections and abortions are widespread in dromedary camels in KSA. 相似文献
98.
Ahmad Ibrahim kudi Caleb Ayuba Anka Muktar Salihu Tekki Ishaya S. 《Tropical animal health and production》2017,49(3):659-662
Tropical Animal Health and Production - 相似文献
99.
Khalid M. Fararh Adel K. Ibrahim Yakot A. Elsonosy 《Research in veterinary science》2010,88(3):400-404
The aim of this study was to examine the effect of glycemic control using thymoquinone (TQ) on energy metabolism related enzymes in leukocytes of streptozotocin (STZ)-induced diabetic rats. The treatment of both TQ and insulin commenced 4 weeks after induction of diabetes. Plasma glucose, cholesterol and triglycerides levels were significantly reduced after TQ treatment, whereas immunoreactive insulin (IRI) showed significant increase. The activities of malate dehydrogenase (MDH) in cytosolic and mitochondrial fractions of peripheral blood leukocytes were significantly higher in rats treated with TQ and insulin as compared to that in diabetic controls. On the other hand the activities of lactic dehydrogenase (LDH) showed no significant changes between groups. ML ratio (cytosolic MDH/LDH specific activity ratio) was restored to those in the control rats. The results of this study demonstrate that TQ significantly increased insulin level and the activities of cytosolic and mitochondrial MDH in leukocytes of STZ-diabetic rats. 相似文献
100.
Abubakar Baba Misau Joseph Kayode Ipinjolu Ibrahim Magawata Abubakar Yunusa 《农业科学与技术》2013,(11):857-869
A research was conducted to assess the effects of three different drying techniques, namely open sun drying (OSD), solar dryers (SD) and solar tent dryers (STD). Data on physical characteristics such as weight, total length and standard length were recorded and proximate composition of the fish sample Clarias gariepinus (Burchell, 1822) was carried out before, during and after drying to assess changes on physical characteristics and nutrient composition at different level. After drying, the samples were subjected to storage for eight weeks. The result obtained shows that there was no significant (P 〉 0.01) difference in the drying weight of the fish samples between the direct SD and the STD. However, for the total and standard length there was significant (P 〈 0.01) difference in the drying techniques, but no significant difference (P 〉 0.05) in the drying period. There was no significant (P 〉 0.05) difference on the physical parameters, storage period, proximate composition of both direct SD and STD and the drying period, respectively. Therefore, direct SD can be substituted with the STD without altering the quality of the product. 相似文献