|
|
|
| Registros recuperados: 677 | |
|
| |
|
|
| Gallo,J. Romano; Hiroce,Rúter; Miranda,Luiz T. de. |
| Análises de folhas de milho (híbrido H-6999B) foram correlacionadas com as produções em 31 ensaios de adubação em diferentes localidades e solos do Estado de São Paulo. Num total de 24 ensaios para nitrogênio e 26 para o fósforo foram encontradas as correlações: nitrogênio, r = 0,51++, y = - 4,26 + 28,66 x; e fósforo, r =0,47++, y = 43,21 + 160,83 x. As correlações para nitrato não foram consistentes. A omissão de enxofre na presença de NPK resultou em decréscimo variável na produção e no teor de S-S0(4) nas folhas. Com base nos resultados foram estabelecidos os seguintes níveis limiares nas folhas: nitrogênio (N) = 2,90%; fósforo (P) = 0,230%; potássio (K), latossolo roxo = 1,70%; solos podzolizados com cascalho = 2,80%; outros solos = 2,10 a 2,70%. |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1968 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051968000100015 |
| |
|
|
| Williams, Robert J.; Baker, J.R.. |
| The use of response surface designs in preference to factorial designs in agriculture has become widely discussed and recommended. This paper simulates data for comparable response surface and factorial designs and uses this to demonstrate the similarities between the designs and their analyses and at the same time to point out some of the customary differences in their analyses. More particularly, it aims to show: (a) that for any design a reduction in the number of plots sown reduces the reliability of the results, and (b) that both a response surface design and a factorial design allow the calculation of estimated equations of response surfaces. |
| Tipo: Journal Article |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1968 |
URL: http://purl.umn.edu/9206 |
| |
|
|
| Doesburg Sr., P.H. van. |
| In 1883 J. M. F. Bigot described Speghina? macropoda after one female from "Birmania". Bigot used to place a question mark after the generic name when he was not sure that the described species did belong to the genus in question. The not forwardly produced oral margin, the presence of a facial tubercle, the spinose hind femora, and the wing-venation created a doubt about the correct use of the name Sphegina. He thought macropoda might need a new genus. De Meijere (1908) erected the new genus Spheginobaccha with Sphegina macropoda Bigot as type-species. He recorded one ♂ and one ♀ from Semarang, Java. He described both specimens and figured the wing. Though in many respects his female answered to Bigot's description of the female, De Meijere found also... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/319403 |
| |
|
|
| Molenaar, J.G. de. |
| As delimited by Polunin (1951), the Arctic is situated on the Northern hemisphere North of (1) a line 50 miles North of the coniferous forest line, (2) the Northern limit of microphanerophytic growth, or (3) the Nordenskjöld line, according to the formula V = 9-0,1K. According to this delimination the whole of Greenland belongs to the arctic region. Within the Arctic a subdivision in low- and high-arctic regions is usually recognized. Larsen (1960) marks this transition on the East coast of Greenland near Cape Dalton. Low-arctic East Greenland thus stretches from 60° to 69°30' N. lat. The Angmagssalik area in Southeast Greenland ranges from circa 65° to 67°20' N. lat. Between the Sermilik and the Kangerdlugssuatsiak fjords to the West and East, Denmark... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/534746 |
| |
|
|
| Catani,R.A.; Alcarde,J.C.; Furlani,F.R.. |
| A presença de uréia nas misturas de fertilizantes é, atualmente, muito comum em virtude do citado material apresentar elevado teor de nitrogênio (46% de N, aproximadamente), ao lado de outras características físico-químicas desejáveis. O presente trabalho relata a determinação da uréia em mistura de fertilizantes pelo método da urease. A uréia do extrato aquoso do fertilizante é convertida em amônia através da urease. A amônia é neutralizada por uma quantidade conhecida e em excesso de ácido sulfúrico. O excesso de ácido sulfúrico é determinado e a quantidade de uréia é calculada através do conhecimento do numero de equivalentes de ácido sulfúrico neutralizado pela amônia. A aplicação do método da urease em 4 misturas de fertilizantes contendo nitrogênio... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1968 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761968000100005 |
| |
|
|
| GLória,N.A.; Vitti,G.C.. |
| Neste trabalho são relatados estudos a respeito do método quelatométrico de determinação de sulfato, baseado na titulação do bário residual com solução de EDTA, após a precipitação do citado ânion na forma de sulfato de bário. Foram estudados aspectos relativos ao emprego de diferentes indicadores e passou-se a preconizar o uso de solução de púrpura de ftaleína a 0,2%. São descritos experimentos relativos à determinação de sulfato em soluções puras, observando-se o período de precipitação e a influência de diversos ânions. Finalmente, tendo por base os dados obtidos, é preconizada urna marcha analítica para determinação de enxôfre total e enxôfre-sulfato em material vegetal. Os resultados obtidos quando se empregou a técnica proposta na determinação de... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1968 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761968000100018 |
| |
|
|
| Feen, P.J. van der. |
| An occipito-parietal skull fragment of a male specimen of Odobenus antverpiensis (Rutten, 1907), from the mouth of the River Scheldt (Netherlands) is described and figured. The animal lived probably about the transition Scaldisian-Merxemian (Pliocene-Pleistocene). It lived in coastal marine surroundings rich in shell-bearing molluscs and is not necessarily an indication of cool conditions. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/504030 |
| |
|
| |
|
| |
|
|
| Jeekel, C.A.W.; Overbeek, H.. |
| During an excursion sponsored by the Entomological Department of the Zoölogisch Museum, Amsterdam, to the village of Vent, Inner Oetztal, Tirol, Austria, the authors and the other participants, W. Dekkers, W. N. Ellis, Mrs. A. C. Ellis-Adam, W. van Raamsdonk, and H. J. L. T. Stammeshaus, witnessed the interesting phenomenon of a migratory flight of syrphid flies. The migration was first noticed around 9.20 a.m. on August 9th, 1967, when the senior author in the valley of the river Venter Ache near Vent saw a great number of insects flying at high speed into one direction. Under the impression at first that it concerned a nuptial flight of a large ant species, a specimen was caught in the air. When this turned out to be a hover-fly, it was at once realized... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/505147 |
| |
|
|
| Rayner, A.C.. |
| The paper presents a model of the New Zealand Sheep Industry which predicts animal numbers in various sex/age categories. The explanatory variables used are the prices of the end products of the industry and time, to represent technological change. Prices are found to have a significant, though delayed, effect on farmers' stock decisions. Furthermore, the significance of time demonstrates improvements in some forms of animal husbandry. The relative failure of the model's latest predictions emphasizes the importance of irrational optimism in the industry. |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries. |
| Ano: 1968 |
URL: http://purl.umn.edu/22690 |
| |
|
|
| Lacourt, A.W.. |
| 1. This paper presents the taxonomy of the Bryozoa Phylactolaemata. The group is found to contain a number of series. The present classification reveals that a number of specific names are synonyms. 2. The evolution of the group is described on the basis of the development of the zoarium and the species-specific statoblasts. 3. The Phylactolaemata are to be considered as a group that have completed their evolution with the development of giant species with giant and specialized forms of statoblasts; this has been accompanied by a reduction in the number of tentacles. 4. The distribution of the species was assessed from the available data. The main concentration is found to occur in the southern hemisphere. 5. The distribution supports the conclusion that... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/317609 |
| |
|
| |
|
|
| Land, J. van der. |
| INTRODUCTION Two years ago I found two specimens of a curious animal in a sample of coral sand from Curaçao. It superficially resembled the larva of priapulids, animals that are restricted to cold water. The condition of the specimens did not permit of a description and I did not succeed in determining the group to which the species could possibly belong. Later I happened to see a paper by Remane (1963) in which he gives a simple figure of "a not yet described animal from the sandy bottom of the Red Sea". I immediately recognized it as a relative of the species from Curaçao. Upon request Professor Remane informed me that he had fixed some specimens, but that these were lost. He had not found more material of the species and he had not heard of these... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.71. |
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/318436 |
| |
|
|
| Gradstein, S.R.; Kern, J.H.. |
| Rhizoma caespitosum. Culmus erectus, triqueter, laevis, inferne foliatus, 15-30 cm altus. Folia culmo multo breviora, viridia vel cinereo-viridia, 1½-2½ mm lata, breviter acuminata, apice scaberula vel sublaevia, vaginis brunnescentibus; ligulae latiores quam longiores, obtusae vel subacutae. Bracteae foliaceae, inflorescentia breviores longioresve, superiores baud vel breviter vaginatae, inferiores vagina usque ad 1½ cm longa instructae; vaginae antice appendicula membranacea in sicco facile destructa provisae. Spiculae 3-4, terminalis ♂, cylindrica, 1½ cm longa, 2 mm lata, laterales ♀, in superiore parte culmi dispositae, oblongo-cylindricae, usque ad 1½ cm longae, 3-4 mm latae, densiflorae, suprema sessilis, inferiores subsessiles vel breviter... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/535076 |
| |
|
|
| Majumdar, N.C.. |
| Herba perennis, gracilis, caule repente valde furcato. Rami erecti vel suberecti, quadrangulares, e gemmis axillaribus emergentes, straminei, squamosi, simpliccs et infra glabrescentes, corymbose furcati et glandulari-pubescentes, sursum altitudine 10—20 cm attingentes. Folia simplicia, exstipulata, sessilia, ad basin connata, opposita, paribus sursum gradatim minoribus et in bracteas transeuntibus, lamina lineari-lanceolata vel elliptico-lanceolata, acuta vel ad basin paulum angustata, apice acuminata, integra, margine paulum incrassata et incurva, coriacea, utrinque glabra, infra pallida, 5—20(—25) x 2—5(—6) mm; nervi praeter medium nervum eminentem obscuri. Flores albi, 5—6 mm longi, ad nodos singulos in axilla folii unius solitarii, cymas terminales... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/524572 |
| |
|
|
| Marcus, Ernst. |
| Mrs. EVELINE DU BOIS-REYMOND MARCUS found the turbellarian described below, which belongs to the Umagillidae (Neorhabdocoela, Dalyellioida), in a vial of Dr. P. WAGENAAR HUMMELINCK’S collection of Caribbean polyclads. The species of Syndesmis are known to live in the body cavity and the intestine, especially the rectum, of sea-urchins, so that the present specimens might have been evacuated together with the faeces. The last revision of the Umagillidae (STUNKARD & CORLISS 1951) was followed by papers of WESTBLAD (1953), HICKMAN (1955, 1956), HICKMAN & OLSEN (1955), and HYMAN (1960). Their results suggest continuing the key of STUNKARD & CORLISS. AS the present species has a simple, not H-shaped, intestine, paired testes, and paired ovaries, the... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/506215 |
| |
|
|
| Hennipman, E.. |
| The identification of some thousands of ferns from New Guinea by the late Dr A. H. G. Alston (1940) resulted in the description of but comparatively few new species. His conclusion, that the fern flora of New Guinea ‘is now fairly well known’ may be right in a general way, but continuous collecting performed after his paper was published proved the existence of many more novelties. One of these is a new species of Todea, a representative of the Osmundaceae, a primitive family of ferns, which dates back to the Palaeozoicum (Hirmer, 1938). A recent study by Hewitson (1962) about the comparative morphology of the living Osmundaceae inspired me to make some remarks on the delimitation of the other recent genera. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/526003 |
| |
| Registros recuperados: 677 | |
|
|
|
