全文获取类型
收费全文 | 339篇 |
免费 | 30篇 |
专业分类
林业 | 36篇 |
农学 | 9篇 |
基础科学 | 2篇 |
72篇 | |
综合类 | 2篇 |
农作物 | 14篇 |
水产渔业 | 64篇 |
畜牧兽医 | 96篇 |
园艺 | 21篇 |
植物保护 | 53篇 |
出版年
2024年 | 2篇 |
2023年 | 12篇 |
2022年 | 10篇 |
2021年 | 13篇 |
2020年 | 7篇 |
2019年 | 13篇 |
2018年 | 15篇 |
2017年 | 17篇 |
2016年 | 22篇 |
2015年 | 18篇 |
2014年 | 15篇 |
2013年 | 61篇 |
2012年 | 27篇 |
2011年 | 24篇 |
2010年 | 19篇 |
2009年 | 7篇 |
2008年 | 10篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 9篇 |
2001年 | 5篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1968年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有369条查询结果,搜索用时 18 毫秒
101.
Phyllonorycter apparella, a new record and a new pest of trembling aspen (Populus tremula) in Turkey
Phyllonorycter apparella (Herrich-Schäffer, 1855) (Lepidoptera: Gracillariidae) is a new record for the Turkish fauna and a new trembling aspen(Populus tremula L.) pest for Turkey. Its biology, damage and infestation ratio were studied in Sankami?. (Kars), Turkey, during 1996 and 1997.P. apparella has one generation a year. The developmental stages of the pest are described briefly. P.apparella hibernates in the adult stage. At the beginning of June, the adults appear. Females deposit their eggs on both leaf surfaces, generally one by one, 7–10 days after emerging. The early instars (sap-feeding larvae) start to mine mostly from the underside of leaves. Each mine has one larva, and each leaf may have up to 26 mines. The last instar (tissue-feeding larva) begins to pupate in the mine after mid August. The adults emerge from mid September to the beginning of October, and move to the trunks of old pine trees, where they hibernate in bark crevices. The infestation level may be as high as 90% of the leaves on some trees. 相似文献
102.
The effect of soil amended with stalks of sunflower (Helianthus annuus L.), alfalfa (Medicago sativa L.) and Hungarian vetch (Vicia pannonica Crantz) on onion bulb rot caused byFusarium oxysporum Schlecht. f.sp.cepae (Hanz.) Snyder Hansen andAspergillus niger v. Tieghem was tested in a soil naturally infested with the pathogens under field conditions. All treatments significantly
reduced bulb rot incidence. The fungal and antibacterial populations varied among all of the amended tested soils. Heterotrophic
fungal populations were more effective than heterotrophic bacterial populations in the suppression of disease. The highest
population of fungal microflora was found in plots amended with sunflower stalks. The carbon-to-nitrogen ratio and available
moisture content of amended soils have an indirect suppressive role on disease, by increasing the heterotrophic fungal population.
http://www.phytoparasitica.org posting June 18, 2002. 相似文献
103.
Data are presented on the occurrence of 43 species of the family Apionidae and two species of the family Nanophyidae in Turkey
based on the material obtained mainly by beating stone-fruit trees in NE Turkey. The identity and information about the three
species of Apionidae —Squamapion sp.cf.bifarium (Balfour-Browne),Protapion sp.cf.ruficrus (Germar),Catapion sp.cf.seniculus (Kirby) — must be revised. The faunistic data in the present paper on almost all species add to prior knowledge on their
distribution in Turkey.Hypophyes aphyllae (Peyerímhoff),Ceratapion kasbekianum (Gerstaecker),Squamapion ottonis (Wagner),S. samarense (Faust),S. phocopus (Eppelsheim),Taeniapion rufulum (Wencker),Pseudoprotapion astragali (Paykull),P. ergenense (Becker),Stenopterapion intermedium (Eppelsheim) andOxystoma fausti (Desbrochers) are reported for the first time in the Turkish fauna.
http://www.phytoparasitica.org posting Nov. 8, 2001. 相似文献
104.
The present study dealt with the functional responses of the parasitoid,Eretmocerus longipes Compere (Hym., Aphelinidae) to the densities of the whitefly,Aleurotuberculatus takahashi David et Subramaniam (Hom., Aleurodidae) at different temperatures under the laboratory conditions. The results showed that
when the initial densities ofA. takahashi-3rd instar were raised from 10 to 320 ind./leaf, the numbers of parasitized nymphs increased as well, ranging from 7.0 to
23.1 at 20°C, 9.8 to 42.9 at 25°C, 6.7 to 39.9 at 30°C, and 1.8 to 8.3 ind./leaf at 35°C, respectively. The Holling Disk Equation
was introduced to build up the models of functional responses. The response curves remained type II, although the numbers
of parasitized nymphs were significantly different under different temperatures. The suitable initial densities of the host
whitefly for parasitization were about 80 individuals per leaf. A negative relation was observed between the initial densities
of the whitefly and the parasitization rates by the parasitoid. An increase in the initial densities ofA. takahashi-3rd instars ranging from 10 to 320 ind./leaf resulted in a decrease in the parasitization rate byE. longipes ranging from 70.0% to 7.2% at 20°C, 98.0% to 13.4% at 25°C, 67.0% to 12.5% at 30°C and 18.0% to 2.6% at 35°C with a value
of 0.2877 was significantly smaller than that at 20°C with a vlaue of 1.3354, that at 25°C with a value of 1.6465 and that
at 30°C with a value of 1.1199, respectively (p<0.01). The handling time (Th) forE. longipes was 0.1521 at 35°C, significantly longer than 0.0510 at 20°C, 0.0289 at 25°C and 0.0320 at 30°C, respectively (p<0.01). The
maximum loading number (K) of the parasitized nymphs with a value of 34.5 ind./leaf at 25°C was similar to that with a value
of 31.2 ind./leaf at 30°C, about 1.8 times as high as that with a value of 19.6 ind./leaf at 20°C and 4 times more than that
with a value of 6.6 ind./leaf at 35°C. It was suggested that temperature affected the functional response by balancing searching
rate and handling time. The optimal temperature range for the functional responses ofE. longipes to the densities ofA. takahashi-3rd instar was 25° to 30°C. 相似文献
105.
Gülsün Özyurt Esmeray Kuley Boga A. Serhat Özkütük Mustafa Durmuş Yılmaz Uçar 《Journal Of Aquatic Food Product Technology》2019,28(3):314-328
The impacts of fermentation process with acid and lactic acid bacteria strains (Lactobacillus plantarum, Lactobacillus brevis, Pediococcus acidilactici, Enterococcus gallinarum, and Streptococcus spp.) on the biogenic amine formation of wet and spray-dried fish silage obtained from whole gibel carp (Carassius gibelio, freshwater discard), whole ponyfish (Equulites klunzingeri, seawater discard), and processing by-products of seabass (Dicentrarchus labrax) were investigated. The results showed that among biogenic amines, cadaverine, putrescine, spermidine, spermine, serotonin, dopamine, and agmatine were predominant in all groups. Significant differences (p < 0.05) in biogenic amine concentrations of wet and spray-dried fish silage were observed. Raw fish and wet silages contained histamine level lower than the allowable limit of 50mg/kg, indicating the use of raw fish material with low microbial counts. In addition, no histamine was detected in spray-dried fish silage, except for seabass by-products with a trace quantity of histamine (<0.04mg/100g). The starter culture used for silage preparation did not effectively retard formation of biogenic amines compared to acid silage. It can be concluded that there is potential use of fermented fish silage as a protein source and possibly as a probiotic ingredient for animal feed in both wet and dry form. 相似文献
106.
Measurement of serum biochemical parameters in response to metal exposures can be especially useful to help identify target
organs of toxicity as well as the general health status of animals. Oreochromis niloticus were exposed to 5.0 mg/L Zn, 1.0 mg/L Cd, and 5.0 mg/L Zn + 1.0 mg/L Cd mixture for 7 and 28 days, and alterations in serum
enzyme activities and ion levels were measured. Significant changes in all the biochemical parameters were found to be time
dependent. Following metal exposure, alkaline phosphatase activity was elevated at both exposure periods. No changes in activities
of lactate dehydrogenase and lipase were observed in response to single or combined Zn and Cd exposure at 7 days while they
increased at 28 days. Fish exposed to metals showed a decrease in cholinesterase activity at 7 days followed by a return to
control levels at the end of the exposure period. The individual and combined effects of metals caused a decline in levels
of Na+, Cl−, and Ca2+, especially at 28 days. K+ level increased at 7 days but it returned to control levels with increasing duration of exposure. This study indicated that
the alterations in serum parameters may be a result of the target tissue (i.e., liver, gill, and kidney) damage and dysfunction
induced by the metals and that these parameters can thus be used to assess the effects of metals on organisms. 相似文献
107.
Journal of Plant Diseases and Protection - The brown marmorated stink bug, Halyomorpha halys (Stål), is a pest of many annual and perennial agricultural products. The species is native to... 相似文献
108.
Melanagromyza sojae Zehntner (Hemiptera: Agromyzidae) is known as a pest of several leguminous plants, especially Glycine max, soybean, in several countries worldwide. As a result of an alert raised by soybean producers in the province of Adana, which has a large share of soybean production in Turkey, plant samples in which pupae were observed were collected from two soybean fields in Çukurova in the production season in 2018. The samples were kept in the laboratory and the emerging adults were identified morphologically as M. sojae. Observations made in soybean fields in Turkey are presented. A review of the situation for this pest and its control methods are is presented. This is the first report of M. sojae in Turkey. It is therefore recommended to perform a close monitoring of this pest to investigate more in detail the extent of the damage caused by this pest in soybean crops in Turkey, to identify its variety preferences, other other hosts, natural enemies and control methods to be used. 相似文献
109.
The aim of this study was to determine the spermatological characteristics in male L. abu during the spawning season. Semen was collected weekly by abdominal massage from 26 males in March. In collected semen, volume,
motility, duration of motility, concentration and pH were determined. In the L. abu sperm, volume (μl), motility (%), duration of motility (s), concentration (×109/ml), and pH values were found 45.76 ± 3.55, 54.25 ± 2.93, 330.15 ± 37.92, 4.27 ± 0.40 and 7.87 ± 0.05, respectively. A correlation
was found between semen volume and semen pH. Semen volume and the duration of sperm motility were higher in the 2nd and 3rd
sampling dates than in the 1st and 4th sampling dates (P < 0.05; P < 0.01, respectively). Neither sperm motility nor sperm concentration was affected by sampling dates. Major changes in semen
pH were observed in the 4th sampling date (P < 0.001). The Pearson correlation test presented significant relationships with the duration of motility, semen volume, and
motility. Semen pH values were significantly correlated with the sperm concentration and semen volume. Sperm concentration
was inversely correlated with semen volume. Sperm motility and duration significantly correlated with total weight. Total
length significantly correlated with the duration of motility and total weight. In conclusion, these characteristics represent
a valuable baseline dataset for establishing a semen quality standard and provide background information that may be useful
for assisted breeding programs in this species. 相似文献
110.