全文获取类型
收费全文 | 114篇 |
免费 | 8篇 |
专业分类
林业 | 15篇 |
农学 | 7篇 |
29篇 | |
综合类 | 7篇 |
农作物 | 2篇 |
水产渔业 | 3篇 |
畜牧兽医 | 32篇 |
园艺 | 1篇 |
植物保护 | 26篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 4篇 |
2018年 | 9篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 9篇 |
2012年 | 6篇 |
2011年 | 7篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1997年 | 2篇 |
1991年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1967年 | 1篇 |
1893年 | 1篇 |
排序方式: 共有122条查询结果,搜索用时 15 毫秒
61.
Marcelo?C.?de?AlvesEmail author Fábio?M.?da?Silva Jair?Campos?Moraes Edson?A.?Pozza Marcelo?S.?de?Oliveira Júlio?C.?S.?Souza Luciana?S.?Alves 《Precision Agriculture》2011,12(1):18-31
The advent of geostatistics and geographical information systems has made it possible to analyze complex spatial patterns
of ecological phenomena over large areas in applied insect ecology and pest management. The objective of this study was to
use geostatistics to characterize the spatial structure and map the spatial variation of damage caused by the berry borer
(Hypothenemus hampei) and leaf miner (Leucoptera coffeella) in a coffee agroecosystem planted with the cultivar Catuai Vermelho IAC-99. Infestations of berry borer and leaf miner were
evaluated in fruits and leaves, respectively. The pests were monitored at 67 georeferenced points in an area of 6.6 ha in
2005, 2006 and 2007. Variograms estimated by the method of moments (MoM) and residual maximum likelihood REML were compared.
The latter were generally better in terms of the kriging error coefficients. Spherical variograms estimated by REML for berry
borer infestation in fruits had ranges of spatial dependence of 34.62–118.4 m and for the leaf miner they were 53.93–133.7 m.
For models fitted by weighted ordinary least squares (OLS) to the MoM experimental variogram, the ranges varied between 37.22
and 68.67 m for the berry borer and 100 and 155.4 m for leaf miner infestation. The variogram model parameters were used with
the data for ordinary kriging to map the spatial variation of coffee pests for different monitoring periods. If there was
no suitable variogram, inverse distance weighting was used to map the variation. The maps enabled visualization of the intensity
of infestation of the insect pests for the different periods evaluated. 相似文献
62.
Samira Santiago Librelon Fernanda Aparecida Castro Pereira Paula Furtado de Pádua Nathália Bottrel Maia Pereira Luanna de Barros Wanderley Gomes Rafael Pereira Lucas Fidelis Pereira Edson Ampélio Pozza Elaine Aparecida de Souza 《Plant pathology》2022,71(6):1431-1439
Angular leaf spot (ALS), an important disease of common bean (Phaseolus vulgaris), is caused by the fungus Pseudocercospora griseola. This pathogen has a wide genetic variability and, therefore, poses a challenge to integrated disease management. The use of resistant cultivars is difficult; hence, the application of fungicides has been a common practice in common bean cultivation. P. griseola strains were morphophysiologically characterized and their sensitivity to common fungicides used to control ALS was studied. The strains were evaluated for sporulation capacity and a representative sample of 34 strains was bioassayed to determine their sensitivity to commercial concentrations of five fungicides, namely pyraclostrobin, mancozeb, pyraclostrobin + metconazole, chlorothalonil and tebuconazole. Another sample of 29 strains was studied for conidial germination and dimensions. Sporulation capacity ranged from 0.88 to 27.67 × 104 conidia/ml and germination percentage ranged from 39% to 72%. The large differences among strains suggest a wide genetic variability among the strains. A wide variability in aggressiveness of P. griseola was observed, which has consequences for breeding programmes aimed at resistance. The behaviour of pathogen strains differed in every fungicide evaluated, even in a population that has not been under selection pressure in the field. These results confirm the need for further studies and may guide future research with this pathogen. 相似文献
63.
64.
65.
Edson Bertolini Julio García Alberto Yuste Antonio Olmos 《European journal of plant pathology / European Foundation for Plant Pathology》2010,128(3):283-287
Table grapes from one of the most important growing area in Spain (Vinalopó, Alicante) protected by the Designation of Origin
“Vinalopó bagged table grape”, were surveyed and analysed to determine the prevalence of the five viruses included in the
Spanish certification program: Arabis mosaic virus (ArMV), Grapevine fanleaf virus (GFLV), Grapevine fleck virus (GFkV), Grapevine leafroll associated virus-1 (GLRaV-1) and Grapevine leafroll associated virus-3 (GLRaV-3). Ninety five sampling points were selected and the position of grapevine plants georeferenced. Samples were collected
in two different vegetative periods and analyses were performed by ELISA and real-time RT-PCR. Purified RNA and immobilized
viral targets from plant extracts on nylon membranes were used in parallel assays as templates for PCR assays. In order to
analyse these five viral species by real-time RT-PCR, new specific primers and TaqMan probes were designed for detection of
ArMV and GFkV. Real time RT-PCR from purified RNA was more sensitive than spot version and ELISA tests. The most prevalent
virus was GFLV (95.8%) followed by GLRaV-3 (94.7%), GLRaV-1 (66.3%) and GFkV (65.3%). ArMV was not detected in any sample.
The high level of viral infections and the presence of mixed infections suggest that initial infected plant material and uncontrolled
traffic of propagation material have played an important role in the spread of viruses. 相似文献
66.
Wellington Bressan Jose Edson Fontes Figueiredo 《European journal of plant pathology / European Foundation for Plant Pathology》2008,120(3):311-316
Two isolates of Streptomyces spp. DAUFPE 11470 and DAUFPE 14632 were evaluated to determine the antagonist–pathogen inoculum concentration relationship
under greenhouse conditions. Pathogen and antagonist concentration, significantly (P < 0.05) affected development of Fusarium disease in maize with a significant interaction between pathogen and antagonist
concentration. Dose–response relationship also differed significantly (P < 0.05) between the two isolates, but both isolates demonstrated effective control of Fusarium disease, regardless of pathogen
concentration. The isolate DAUFPE 11470 provided the most effective control. The lowest value for disease incidence occurred
at low pathogen (103 chlamydospore g−1 soil) and high antagonist concentration (106 cfu ml−1) for both isolates. The disease incidence for control plants ranged from 19% to 76%. However, in relation to control the
lowest disease reduction occurred at low pathogen (103 chlamydospore g−1 soil) and high antagonist concentrations (106 cfu ml−1). These reductions were 10.6% and 13% for DAUFPE 14632 and DAUFPE 11470, respectively. The highest disease reductions, in
relation to control plants, occurred at high pathogen (106 chlamydospore g−1 soil) and antagonist (106 cfu ml−1) concentrations for both isolates. These values were 55% and 62.2% for DAUFPE 14632 and DAUFPE 11470, respectively. The chlamydospore
germination of Fusarium moniliforme was affected by glucose addition, antagonist isolates and type of inoculum. The lowest chlamydospore germination was observed
with bacterial suspensions of the isolates, for all glucose additions. The results suggested that both Streptomyces spp. isolates were effective at different doses as biocontrol agents against F. moniliforme. Also, there was evidence for at least two mechanisms of biocontrol and that apparently, both isolates showed the same mechanisms
of biocontrol action related to production of bioactive compounds and competition for carbon. Further studies will be developed
to improve the level and effectiveness of control by these isolates. 相似文献
67.
68.
Survival of seeds from perennial biomass species during commercial‐scale anaerobic digestion 下载免费PDF全文
K A Baute D E Robinson L L Van Eerd M Edson P H Sikkema B H Gilroyed 《Weed Research》2016,56(3):258-266
Tall perennial grass species can be utilised as bioenergy feedstocks, but some are considered invasive species. Using biomass from such species as feedstocks for anaerobic digestion (AD) may introduce the risk of disseminating viable seeds onto agricultural lands during digestate application. To evaluate this risk, we investigated the survival rates of perennial grass seeds obtained from biomass species during AD. After removal from the digester, seeds were germinated and stained with tetrazolium chloride to determine viability. During three experimental runs, batches of 100 seeds from four species were exposed to 0, 2, 6, 12, 24, 48, 72 and 168 h of mesophilic (38°C) AD within a commercial‐scale digester. Seed viability of Phalaris arundinacea, Phragmites australis, Panicum virgatum and Solanum lycopersicum was reduced by 95% (LT95) after 29, 52, 98 and 105 h of AD respectively. Commercial digesters that utilise perennial grasses as a feedstock typically have retention times ranging from 240 to 1480 h, which greatly exceeds the LT95 values found in this study. Anaerobic digestion resulted in the rapid death of seeds in all species tested, suggesting unwanted dissemination of perennial grass species via digestate application to agricultural land is unlikely. 相似文献
69.
70.
Urban sediment particle size and pollutants in Southern Brazil 总被引:1,自引:1,他引:0
Cristiano Poleto Edson C. Bortoluzzi Susanne M. Charlesworth Gustavo H. Merten 《Journal of Soils and Sediments》2009,9(4):317-327