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A MODEL OF YIELD VARIABILITY AND PRICE EFFECT AgEcon
Hildreth, Clifford; Kislev, Yoav.
Tipo: Working or Discussion Paper Palavras-chave: Crop Production/Industries.
Ano: 1980 URL: http://purl.umn.edu/13755
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A model to define operational irrigation frequency for maximum yield of crops. Repositório Alice
MILLAR, A. A.; CHOUDHURY, E. N..
Se describe un modelo para definir la frecuencia operacional de riego para obtener maxima produccion de los cultivos. El modelo usa como informacion basica la respuesta de la planta e las condiciones de humedad en el suelo, caracteristicas de retencion y movimiento del agua en el suelo, evapotranspiracion y demanda atmosferica. Se presentan los resultados de la aplicacion del modelo en cultivos de tomate y frijol, en un suelo franco arenoso. Se discute el uso de la informacion mundial de la relacion entre rendimiento de los cultivos y el potencial matricial de agua en el suelo.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Frequencia; Bean; Tomato; Balanço Hídrico; Feijão; Irrigação; Tomate; Frequency; Irrigation; Water balance.
Ano: 1980 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/132547
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A neoclassical analysis of macroeconomic policy Buscador Latinoamericano
Beenstock, Michael.
Tipo: Text Palavras-chave: MERCADO; BIENES; DINERO.
Ano: 1980 URL: http://www.flacso.org.ec/biblio/shared/biblio_view.php?bibid=14541&tab=opac&oai:flacso.org.ec:14541
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A new cavernicolous freshwater crab from New Guinea (Crustacea Decapoda) Naturalis
Holthuis, L.B..
Through the kindness of Mr. Philip Chapman of Culford, Bury St. Edmunds, Suffolk, it was made possible for me to examine a male and a female of a species of cavernicolous crab from the Western Highlands of Papua New Guinea, collected there by Mr. N. Plumley. The species proved to be new to science and its description is given below. A recent revision of the New Guinea freshwater crabs (Bott, 1974) listed 13 certain and 3 dubious species from the island. These 13 species belong to 3 genera (Rouxana Bott, 1969: 5 species; Geelvinkia Bott, 1974: 3 species; and Holthuisana Bott, 1969: 5 species). The first two genera and the nominate subgenus of the third are confined to New Guinea. All three genera belong to the family Sundathelphusidae Bott, 1969. The new...
Tipo: Article / Letter to the editor Palavras-chave: 42.74.
Ano: 1980 URL: http://www.repository.naturalis.nl/record/318439
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A new fruit bat of the genus Myonycteris Matschie, 1899, from eastern Kenya and Tanzania (Mammalia, Megachiroptera) Naturalis
Bergmans, W..
Myonycteris relicta n. sp. is described from the Shimba Hills in southeast Kenya and from the Usambara Mountains in northeast Tanzania. The species is larger than the only other known African mainland species of the genus, Myonycteris torquata (Dobson, 1878), from the Central and West African rain forests and, if compared to M. torquata and the only other species in the genus, M. brachycephala (Bocage, 1889) from São Tomé, has a relatively longer rostrum, a more deflected cranial axis, and further differs in number, shape and position of its teeth. The new species provides new arguments for the relationship between the genera Myonycteris Matschie, 1899, and Lissonycteris Andersen, 1912. It is believed that Myonycteris relicta may be a forest species and as...
Tipo: Article / Letter to the editor Palavras-chave: 42.84.
Ano: 1980 URL: http://www.repository.naturalis.nl/record/319404
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A new genus and species of bopyrid isopod infesting alpheid shrimps of the genus Synalpheus in the western Atlantic Ocean Naturalis
Bourdon, R.; Markham, J.C..
Bopyrione synalphei, new genus, new species, a parasite of Synalpheus goodei Coutière in the northeastern Gulf of Mexico, S. bousfieldi Chace, S. pectiniger Coutière and Synalpheus spp. in Haiti and Synalpheus sp. in Curaçao, is described. A member of the bopyrid subfamily Bopyrinae, whose diagnosis is slightly amended to accommodate it, it is closely allied to the genera Bopyroides Stimpson and Bopyrina Kossmann. Reexamination of the holotype of Bopyroides woodmasoni Chopra, 1923, a parasite of Synalpheus neomeris (de Man) in the Andaman Islands, indicates that it is also assignable to Bopyrione.
Tipo: Article / Letter to the editor Palavras-chave: 42.74.
Ano: 1980 URL: http://www.repository.naturalis.nl/record/319251
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A new genus and two new species of the family Paradoxosomatidae from Australia (Diplopoda, Polydesmida) Naturalis
Jeekel, C.A.W..
Description of a new genus, Streptocladosoma, with two new species S. dissimile and S. albovittatum, both from Queensland. The genus belongs to the tribe Australiosomatini, and is remarkable on account of the complicated structure of the gonopods, which seem to represent the most highly evolved type as yet reported in the tribe.
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/505583
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A new record and a redescription of <i>Brania subterranea</i> (Polychaeta, Syllidae): Léopold III Biological Station, Laing Island. Contribution n° 18 = Une nouvelle station et une rédescription de <i>Brania subterranea </i>(Polychaeta, Syllidae): Station Biologique Léopold III, Ile de Laing. Contribution n° 18 OMA
Govaere, J.C.R..
<i>Brania subterranea</i> (Hartmann-Schroeder, 1956), recorded for the first time from the West Pacific coasts, is studied by scanning electron microscopy. A well developed nuchal organ with cilia bearing disk-like enlargements could be demonstrated. The entrance of the pharynx carries ten papillae and a circlet of ordinary cilia. The fine structure of the simple and compound bristles and also their distribution in correlation with the length of the specimens is given in detail.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brania subterranea IW; West Pacific.
Ano: 1980 URL: http://www.vliz.be/imisdocs/publications/271869.pdf
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A new species of Arenaria (Caryophyllaceae) from the western Himalaya Naturalis
Majumdar, N.C..
The article contains a discussion regarding the different identity of the specimens J. F. Duthie 3858 in the Kew (K), and the Calcutta (CAL) and Poona (BSI) herbaria. The specimens at CAL and BSI represent a new species of Arenaria, which is described here.
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/525215
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A new species of Echinogammarus from Northern Spain, Echinogammarus pseudoaquilifer nov. spec. (Crustacea, Amphipoda) Naturalis
Platvoet, Dirk; Pinkster, Sjouk.
New material of the genus Echinogammarus belonging to the berilloni-group was collected in the western Pyrenees and north-western Spain. In material from spring regions and caves a new species was found, which in general appearance seems to be intermediate between E. berilloni s.s. and E. aquilifer. A comparative description of the new species is given along with some notes on the ecology of Echinogammarus berilloni.
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/505377
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A new species of Euchirella (fam. Aetideidae) from the "Dana"-collections (Copepoda, Calanoida) Naturalis
Vaupel-Klein, J.C. von.
SUMMARY Euchirella paulinae spec. nov. is described and illustrated in extenso ; various structures are outlined in detail for the first time. The external morphology of the new species is discussed with reference to the other species of the genus. Some brief remarks are made about the anatomical terminology of the mouthparts of Copepoda, and on the necessity to always describe new species really scrutinously. INTRODUCTION In the course of a revision of the aetideid genera Euchirella Giesbrecht, 1888 and Pseudochirella G. O. Sars, 1920, an undescribed species of Euchirella was found in the material originating from the Danish "Dana" Expedition 1928-30. The new species will be reported upon separately in the present paper. Its tentative relationships with...
Tipo: Article / Letter to the editor Palavras-chave: 42.74.
Ano: 1980 URL: http://www.repository.naturalis.nl/record/318845
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A new species of Paraphelaria (Auriculariales) from Borneo Naturalis
Jülich, W..
Fructificatio erecta, cylindracea, apice simplici vel plus minusve ramoso, usque ad 15 x 1-2 mm, brunnea. Systema hypharum monomiticum. Hyphae luteae vel brunneae, leviter tenui-tunicatae, 2.5—4.5 µm in diam., efibulatae. Cystidia desunt. Basidia (phragmobasidia) hyalina, 30-36 x 4-5 µm, tetraspora. Sporae hyalinae, plus minusve allantoideae, tenui-tunicatae, leaves, 12-14 x 4-4.5 µm, inamyloideae. Typus: ‘W. Jülich 78/2541, Borneo, Sarawak, Gunong Mulu National Park, 19 III 1978 (L).
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/532120
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A new species of the family Platyrhacidae from Guadeloupe, West Indies (Diplopoda, Polydesmida) Naturalis
Jeekel, C.A.W..
Description of Proaspis sahlii nov. spec. from Guadeloupe. The new species, which is the third platyrhacid recorded from the West Indies, is compared with its congener Proaspis aitia Loomis, 1941, from Hispaniola, and Nanorrhacus luciae (Pocock, 1894) from St. Lucia.
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/505376
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A new Symplocos (Symplocaceae) from Sumatra Naturalis
Nooteboom, H.P..
Symplocos ramulis valde tomentosis foliis spiraliter dispositis coriaceis subtus glabris vel tomenti vestigiis instructis ellipticis 13 ad 17 cm longis, 4.5 ad 7.5 cm latis, venis primariis 12 ad 17 paribus subtus valde prominentibus in venam intramarginalem convenientibus base cuneata ad rotundata margine valde recurvato apice leviter acuminato petiolo 1 ad 2cm longo. Inflorescentia breve spicata axe bracteis bracteolisque persistentibus tomentosa. Ovarium 1.5 ad 2.5 mm longum calyceque 1.5 ad 2.5 mm alto tomentosum. Corollam staminesque non visi. Discus pilosus. Fructus ellipsoideus ad cylindricus c. 15 mm longus, c. 7 mm latus endocarpio unicellulato cristis 10 instructo. Typus: W.J.J.O. de Wilde & B.E.E. de Wilde-Duyfjes 16040 (L, iso: BO, K),...
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/525064
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A Note on a One-sided, Chebychev-type Inequality AgEcon
Berck, Peter; Hihn, Jairus M..
Tipo: Working or Discussion Paper Palavras-chave: Economics; Statistics.
Ano: 1980 URL: http://purl.umn.edu/37701
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A NOTE ON BIAS IN THE ESTIMATED EFFECTS OF BEEF IMPORTS ON U.S. MEAT PRICES AgEcon
Ryan, Timothy J..
The impact of beef imports on United States meat prices is a highly emotional and controversial issue. Congressmen representing urban districts, and to a lesser extent the Administration, look towards beef imports as a way of containing rapid increases in meat prices. Congressmen and Senators from beef-producing States regard beef imports as a direct attack on the U.S. beef-producing industry. These differing views are being reconciled through Congress considering amendments to the Meat Import Law (Public Law 88-482). The impacts and the amendments are of vital interest to Australia because about 25 per cent of Australia's beef production is sold on the lucrative U.S. market. In this note it is argued that, in general, the reported impacts on U.S. meat...
Tipo: Journal Article Palavras-chave: International Relations/Trade; Marketing.
Ano: 1980 URL: http://purl.umn.edu/23065
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A note on Heterophylly and Branching patterns in the Amyema complex (Loranthaceae) Naturalis
Kuijt, Job.
Attention is drawn to the unusual distribution of flowers and inflorescences in a number of species, and to certain peculiarities of branching and phyllotaxy. The latter are explained by a heterophylly which so far has escaped notice, involving the formation and early disappearance of a pair of minute intercalary cataphylls. A similar branching pattern and flower distribution is evident in Helicanthes.
Tipo: Article / Letter to the editor
Ano: 1980 URL: http://www.repository.naturalis.nl/record/525190
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A NOTE ON THE BOX-COX TRANSFORMATION UNDER HETEROSKEDASTICITY AgEcon
Blaylock, James R.; Salathe, Larry E.; Green, Richard D..
The Box-Cox transformation (BCT) has been frequently used as both a flexible functional form and as a decision device to distinguish among alternative model specifications. Most researchers have failed to recognize that the BCT when applied to the dependent variable can compensate for heteroskedasticity. This paper investigates a new procedure which estimates both the BCT parameters and the analytic form of heteroskedasticity. Results from the new procedure are compared to estimates obtained from the traditional method of estimating BCT models. Comparisons indicate that proper specification of the error variance can influence the magnitude of BCT parameters and alter the results of hypothesis testing.
Tipo: Journal Article Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980 URL: http://purl.umn.edu/32394
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A numerical-model of the m2-tide in the gulf of st-lawrence ArchiMer
Pingree, Rd; Griffiths, Dk.
Tipo: Text
Ano: 1980 URL: http://archimer.ifremer.fr/doc/00121/23264/21093.pdf
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A ocorrência, diagnose e correção da deficiência de zinco na cultura de arroz de sequeiro. Infoteca-e
BARBOSA FILHO, M. P.; FAGERIA, N. K..
As plantas de arroz de sequeiro são sensíveis a deficiência de zinco e, como tem sido intensificado o plantio dessa cultura em solos pobres neste elemento, pode-se considerar o zinco como um dos fatores limitante da produção de arroz.
Tipo: Circular Técnica (INFOTECA-E) Palavras-chave: Arroz; Oryza sativa; Sequeiro; Zinco; Deficiência; Correção; Solos; Cerrado.
Ano: 1980 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/192291
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