|
|
|
| Registros recuperados: 17.702 | |
|
| |
|
| |
|
|
| Makambe, Godswill; Namara, Regassa E.; Hagos, Fitsum; Awulachew, Seleshi Bekele; Ayana, Mekonnen; Bossio, Deborah A.. |
| Agriculture is the most significant contributor to Ethiopia’s economy. Most of the agricultural production is under rainfed conditions and thus extremely sensitive to rainfall variability. Irrigation development, including smallholder irrigation, is used by the Ethiopian Government to attempt to mitigate the effects of rainfall variability. In this study, we look at smallholder irrigation - modern and traditional irrigation systems. A detailed description of the cropping patterns is given. The stochastic frontier production function approach is used to estimate technical inefficiency, and constraints to production are analyzed. Since the traditional system is found to be efficient but on a lower production frontier, the study shows that significant gains... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Rainfed farming; Irrigated farming; Efficiency; Irrigation schemes; Small scale systems; Cropping patterns; Crop production; Economic aspects; Statistical analysis; Agricultural and Food Policy; Crop Production/Industries; Production Economics. |
| Ano: 2011 |
URL: http://purl.umn.edu/118298 |
| |
|
|
| Makombe, Godswill; Namara, Regassa E.; Hagos, Fitsum; Awulachew, Seleshi Bekele; Ayana, Mekonnen; Bossio, Deborah A.. |
| Agriculture is the most significant contributor to Ethiopia’s economy. Most of the agricultural production is under rainfed conditions and thus extremely sensitive to rainfall variability. Irrigation development, including smallholder irrigation, is used by the Ethiopian Government to attempt to mitigate the effects of rainfall variability. In this study, we look at smallholder irrigation - modern and traditional irrigation systems. A detailed description of the cropping patterns is given. The stochastic frontier production function approach is used to estimate technical inefficiency, and constraints to production are analyzed. Since the traditional system is found to be efficient but on a lower production frontier, the study shows that significant gains... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Rainfed farming; Irrigated farming; Efficiency; Irrigation schemes; Small scale systems; Cropping patterns; Crop production; Economic aspects; Statistical analysis; Crop Production/Industries; Farm Management. |
| Ano: 2011 |
URL: http://purl.umn.edu/113012 |
| |
|
| |
|
|
| Siqueira,Marcos Vinicius Bohrer Monteiro; Borges,Aline; Valle,Teresa Losada; Veasey,Elizabeth Ann. |
| This study was carried out in order to assess the genetic diversity of 20 cassava (Manihot esculenta Crantz) genotypes with high phenotypic performance using microsatellite markers. Two groups were considered for this study: eleven varieties for industrial uses and nine for household consumption. By using nine microsatellite primers, high polymorphism was identified in all the loci analyzed, with values reaching 100%. On average, 3.4 alleles per locus were found, with 0.371 the value estimated for the observed heterozygosity and 0.555 for gene diversity for the entire set of varieties. The genetic variability found in both varieties, cultivated on a large-scale in the South Center region of Brazil, is wide enough to allow the choice of divergent parental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manihot esculenta; Genetic diversity; Germplasm; Microsatellites. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400003 |
| |
|
|
| Stuen, Snorre; Grøva, Lise; Granquist, Erik G; Sandstedt, Karin; Olesen, Ingrid; Steinshamn, Håvard. |
| Background: It has been questioned if the old native Norwegian sheep breed, Old Norse Sheep (also called Norwegian Feral Sheep), normally distributed on coastal areas where ticks are abundant, is more protected against tick-borne infections than other Norwegian breeds due to a continuously high selection pressure on pasture. The aim of the present study was to test this hypothesis in an experimental infection study. Methods: Five-months-old lambs of two Norwegian sheep breeds, Norwegian White (NW) sheep and Old Norse (ON) sheep, were experimentally infected with a 16S rRNA genetic variant of Anaplasma phagocytophilum (similar to GenBank accession number M73220). The experiment was repeated for two subsequent years, 2008 and 2009, with the use of 16... |
| Tipo: Journal paper |
Palavras-chave: Sheep and goats; Health and welfare. |
| Ano: 2011 |
URL: http://orgprints.org/19867/1/PAPER_III.pdf |
| |
|
|
| Passos,Flávio Dias; Magalhães,Frederico Thomaisino. |
| During identification of bivalve molluscs collected in Antarctica, a rich taxonomic bibliography was gathered, stimulating comparisons with the Brazilian malacofauna. We listed a total of 68 and 368 known shallow-water species (less than 200 m depth) from Antarctica and Brazil, respectively, in order to find species, families and superfamilies in common, and to investigate how these malacofaunas differ in regard to these representative groups and their life habits. There are 23 superfamilies absent in Antarctica, but present in Brazil with at least one species; the reverse does not occur, as all superfamilies known from Antarctica are also recorded from Brazil. The number of Brazilian species is higher, being composed of a mixture of taxa from different... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Checklist; Shallow waters; Brazilian fauna; Antarctic fauna. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000100014 |
| |
|
|
| Shaheed SM; Rohit JP; Madhan R; Selvakumar K. |
| Ethanol derived from non-edible biomass is renewable and a clean source of energy. It is independent of the food industry and it is economically feasible. The first generation biofuel or bioethanol is still not a very convenient source of energy as it prominently depends on the availability of grains. The main objective of this work is to develop an industrious efficient process to produce ethanol from lignocellulosic biomasses like wood and leaf in a lab scale. Two processes were compared. The first process involved an alkaline pre-treatment of the powdered biomass followed by dilute acid hydrolysis. The second process involved an alkaline treatment followed by direct hydrolysis of the biomass by use of a fungal species obtained from rotting wood.... |
| Tipo: Manuscript |
Palavras-chave: Biotechnology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6579/version/1 |
| |
|
| |
|
| |
|
| |
|
|
| Arpe, K.; Leroy, S.a.g.; Mikolajewicz, U.. |
| Model simulations of the last glacial maximum (21 +/- 2 ka) with the ECHAM3 T42 atmosphere-only, ECHAM5-MPIOM T31 atmosphere-ocean coupled and ECHAM5 T106 atmosphere-only models are compared. The topography, land-sea mask and glacier distribution for the ECHAM5 simulations were taken from the Paleoclimate Modelling Intercomparison Project Phase II (PMIP2) data set while for ECHAM3 they were taken from PMIP1. The ECHAM5-MPIOM T31 model produced its own sea surface temperatures (SST) while the ECHAM5 T106 simulations were forced at the boundaries by this coupled model SSTs corrected from their present-day biases and the ECHAM3 T42 model was forced with prescribed SSTs provided by Climate/Long-Range Investigation, Mapping, and Prediction project (CLIMAP). The... |
| Tipo: Text |
|
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00228/33888/32274.pdf |
| |
|
|
| Lopes,José; Korasaki,Vanesca; Catelli,Lizandra L; Marçal,Viviani V. M; Nunes,Maria Paula B. P. |
| The study was conducted at the Mata dos Godoy State Park in Londrina, state of Paraná, Brazil. Baited pitfall traps were installed in the forest, in adjacent abandoned pasture land, and on the borders between these two environments. Every two weeks, from June 1999 to May 2000, the traps were placed for 24 hours and the material was collected every 12 hours. The 4687 specimens of Scarabaeinae collected belong to 13 genera and 27 species. The most frequent species were Onthophagus catharinensis (Paulian, 1936) (22.1%), Onthophagus hirculus (Mannerhein, 1829) (20.1%), Dichotomius mormon (Ljungh, 1799) (13.1%), Sulcophanaeus menelas (Laporte, 1840) (12.8%), and Eurystemus parallelus (Dalman, 1824) (10.6%). The other species collected amounted to less than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coprophagous beetle; Ecological indicator; Forest fragment; Pitfall; Scarabaeidae. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000100011 |
| |
|
|
| Fracasso,Hélio Augusto Alves; Branco,Joaquim Olinto; Barbieri,Edison. |
| Despite being widely distributed in South America and having relatively large populations, little is known about the trophic ecology of the South American Tern (Sterna hirundinacea) and Cabot's Tern (Thalasseus acuflavidus). In Brazil, South American and Terns Cabot's breed in mixed colonies from the state of Espírito Santo to Santa Catarina. Here, we describe results of a study of the feeding ecology of these two species during the reproductive seasons of April to October of 2003, 2005 and 2006 from Cardos Island, Santa Catarina, Brazil. A total of 6248, 5140, and 4006 fishes were delivered to chicks or females by South American Terns; and 1157, 628 and 98 fish and or other prey items by Cabot's Terns during the breeding seasons of 2003, 2005, and 2006,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cabot's Terns; South American Terns; Feeding ecology; Prey; Foraging. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000300016 |
| |
|
| |
|
|
| Vanzetti, David; Setyoko, Nur Rakhman; Ngoc Que, Nguyen; Trewin, Ray. |
| Both Indonesia and Vietnam, as members of ASEAN, have negotiated a free trade agreement with China (ACFTA). ASEAN Member States can independently negotiate their tariff reductions. Both countries are generally aware of the opportunities access to the large Chinese market may present, but both are concerned to differing degrees about being flooded with Chinese imports, including agricultural products. As the time for implementation approaches, Indonesia has expressed a desire to renegotiate its tariff reduction schedules to protect sensitive sectors, including agriculture. By contrast, Vietnam, just over the border from China and with a history of informal trade, seems more accepting of the prospects. A global general equilibrium model, GTAP, is used to... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: International Relations/Trade. |
| Ano: 2011 |
URL: http://purl.umn.edu/101002 |
| |
|
|
| Hamann, T.; Smets, E.; Lens, F.. |
| Bark anatomy is an unappreciated discipline in plant systematics, despite its great potential to reveal systematically informative features. In this paper, main reasons for the lack of detailed bark anatomical data in many plant families are identified, including problems with sectioning, terminological issues, and difficulties in observation of dilated stems. We deal with these problems by focusing on two aspects: (1) compare, discuss and improve existing sectioning and maceration techniques using two species with soft and hard bark tissues; and (2) discuss the best way to collect stem bark samples. We hope that this paper will stimulate inclusion of bark anatomical data in future systematic studies. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bark anatomy; Light microscopy; Macerations; Plant systematics; Phloem; Sectioning; 42.54. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/421834 |
| |
|
| |
|
|
| Hathaway-Jenkins, L. J.; Sakrabani, R; Pearce, Bruce; Whitmore, A. P; Godwin, R. J.. |
| Organic farming and improvements to agricultural sustainability are often seen as synonymous. However, an extensive European review demonstrated that in practice this is not always true. This study aims to compare the status of soil and water properties between separate fields managed in either an organic or a conventional manner. Soil samples were collected from 16 pairs of farms, throughout England, with both arable and grass fields within each pair on similar soil type. Chemical (nutrients, pesticides, herbicides) and physical (aggregate stability, field capacity, shear strength, soil organic matter, infiltration rates) soil properties were measured in four main soil texture classes in organic and conventional fields. The physical soil properties varied... |
| Tipo: Journal paper |
Palavras-chave: Soil quality. |
| Ano: 2011 |
URL: http://orgprints.org/18705/1/Hathaway_Jenkins_2011_SUM_paper.pdf |
| |
| Registros recuperados: 17.702 | |
|
|
|
