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| Registros recuperados: 268 | |
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| Medina,J. C.. |
| Sisal (Agave sisalana Perrine) accounts for about one half of the world's production of hard fibers. In spite os its economic importance pratically no research work has been carried out on this plant. Very little is known about the agronomic problems of its cultivation, while the physiological and genetic problems are nearly unknown. This is perhaps due to the fact that A. sisalana is a perennial plant with a life cycle of 5-8 years and the carrying out of field research work requires a great deal of time and is very expensive. This paper, the first of a series to be published on the agronomic problems of sisal cultivation, presents the data obtained from field trials on distance of planting and its relation to weight and number of leaves produced. The... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1948 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051948000100007 |
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| Stafleu, F.A.. |
| This publication is intended to be the first part of a taxonomic monograph of the family Vochysiaceae and deals with the genera Salvertia and Vochysia. Since Warming’s excellent treatise of the Brazilian species of this family in the Flora Brasiliensis (Vol. XIII, II,1875) a large number of new species has been described, especially from neighbouring countries, and much new material has been collected. The fact that the number of species of Vochysia has been doubled since Warming may give a raison d’être to this monograph. A large quantity of material was kindly put at my disposal by several herbaria. These herbaria are indicated in this monograph by the following abbreviations proposed by the Standing Committee for Urgent Taxonomic needs of the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/534751 |
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| Druce, P.C.. |
| The financial year which ended 30th June, 1946, was the third year in which a group of selected wheat growers kept complete records of their financial transactions in co-operation with and in Record Books provided by the Division of Marketing and Agricultural Economics. A report covering the records kept in the year 1944-45 has already been published in this "Review." |
| Tipo: Journal Article |
Palavras-chave: Agribusiness. |
| Ano: 1948 |
URL: http://purl.umn.edu/9028 |
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| Franco,C. M.. |
| It has been noticed in the greenhouse of the "Instituto Agronômico de Campinas" that many species of plants developed poorly when planted in seed beds that have been repeatedly used without change of soil. In many cases even the seeds would not germinate in such seed beds. Experiments have showed that the; lack of normal plant development in these beds is the result of the increase in soil salinity. This salinity may be due to additions of fertilizers or to salts introduced in the ordinary applications of water. It was found that the soil solution had an osmotic pressure of 13.5 athmospheres at the wilting point. The tests showed that common bean (Phaseolus vulgaris L.) plants were more susceptible to the soil salinity than were the soybean and the corn... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1948 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051948000100002 |
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| Franco,C. M.; Loomis,W. E.. |
| Moderate amounts of KH2PO4 (0.5 to 0.7 millimols) caused iron chlorosis of seedlings in solutions less acid than pH 5.5-6.0. The trouble could be avoided by omitting the phosphorus entirely and adding it separately after 2-4 days. Even with this modification the Knop type of solution (Hoagland, 2) caused persistent chlorosis in soybeans and broccoli. In the commonly used Shive solution (R5-C2) a large excess of KH2PO4 holds the pH of the solution between 4.5 and 5.0 and chlorosis is moderate to slight. The Shive solution contains 36 times as much phosphorus as the Hoagland and 6-week-old plants growing in it absorbed 15 times as much to make a slightly poorer growth. The addition of as little as 0.125 g per liter of NH4NO3 resulted in decidedly acid... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1948 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051948000100006 |
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| Bloembergen, S.. |
| Trees or shrubs, buds with many perules. Leaves decussate, petiolate, entire, palmate or pinnate, appearing simultaneously with the flowers or later, exstipulate. Inflorescence racemose, corymbose or spicate, terminal with 2-4 leaves, or rarely terminal or axillary without leaves. Monoecious or dioecious, flowers actinomorphic, ♂ and ♀, ovary in the ♂ fls more reduced than stamens in ♀ fls. Calyx and corolla 4-5-merous. Stamens 4-10, mostly 8, hypogynous or perigynous. Disc extraor intrastaminal. Ovary superior, 2-celled, laterally flattened, each cell with 2 ovules. Fruit a samara, splitting into 2, rarely 3, winged usually 1-seeded parts. Seed without endosperm, radicle elongate, cotyledons foliaceous, or thickened, plicate, involute or flat. Distr. Ca... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532578 |
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| Steenis, C.G.G.J. van. |
| Trailing shrubs or lianas without special organs for climbing, branches rarely flexuose; stem with wide vessels, raphides in the flowering parts; bark often with short linear lengthwise lenticels. Growth in flushes from terminal and axillary buds. Indumentum of stellate or simple hairs. Stipules minute, obsolete, or absent. Leaves simple, scattered, petiolate, serrate or callous-dentate, penninervous, midrib sulcate, veins in cross-bars, veinlets reticulate. Inflor. lateral, often on a common peduncle forked at the apex, cymose, often pseudo-umbellate; bracts 2, at the apex of the peduncle. Flowers mostly white, dioecious (or polygamous), 5(-4)- merous. Sepals distinctly imbricate (rarely valvate), free or subconnate at the base, persistent. Stamens (10-)... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532606 |
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| Steenis, C.G.G.J. van. |
| It seemed useful to correct some errors which have crept into the text of volume 4 as well as to add some additional data which came to our knowledge and are worth recording. Valuable help in general was rendered by Dr R. C. BAKHUIZEN VAN DEN BRINK Jr, for additions to the Burmanniaceae by Dr F. P. JONKER, for Chenopodiaceae by Dr C. A. BACKER, for Viburnum by Mr J. H. KERN, for Xyris by Dr P. VAN ROYEN, and for a grass by Dr P. JANSEN. Printing errors have only been corrected if they may give rise to confusion. The page numbers a and b denote respectively the left and right column. |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532699 |
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| Santos,S. Ribeiro dos; Fraga Jr.,C. G.. |
| This paper describes an experiment with factorial design and two levels of treatment, used in testing fertilizer applications for tobacco seed beds. The fertilizers employed were : Chilean nitrate, superphosphate, potassium chloride, and cotton seed meal. Tobacco plants were grown in ten liter clay pots containing a steam sterilized soil composed of equal parts* of thoroughly mixed sub-soil and surface washed sand. Each of the sixteen treatments tested was applied to six pots and these were divided into three replications of two pote each. Measurements of height and weight of the plants were taken about two months after the seed germinated. An analysis of the data obtained is presented and shows that under the conditions of the test, all fertilizer... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1948 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051948000100009 |
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| Backer, C.A.. |
| Annual or perennial herbs or undershrubs, sometimes fleshy. Leaves simple, entire or subentire, opposite, spread, or spuriously whorled, sometimes minute, stipulate or not. Stipules often small, scarious, fugacious. Flowers axillary, solitary, clustered or fascicled, cymose, pseudoracemose, or subumbellate, actinomorphic, usually ♀, often small and inconspicuous. Tepals 5, either free, imbricate in bud, herbaceous with scarious often white margins or entirely scarious, persistent, conniving before and after anthesis, or a distinctly gamophyllous, corolline or calycine 3—8-lobed perianth with usually persistent, herbaceous lobes imbricate or rarely valvate in bud. Stamens 1-~, perigynous or hypogynous, free or connate at the base, either singly or in... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532550 |
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| Castro,G. Paiva; Correia,F. A.. |
| Tests were made on samples of ramie fibers (Boehmeria nivea Hook., var. locally known as Murakami), obtained from three month old plants grown at Campinas, State of São Paulo. The harvested material was processed and the fibers were degummed and bleached by the methods described. The physical and chemical tests made on six samples of the fibers gave the following average results : PHYSICAL TESTS Length maximum.................................. 360 mm average .................................. 200 mm minimum .................................. 90 mm Width maximum ................................. 63 mm average................................... 32 mm minimum .................................. 16 mm Tensile Strength maximum .................................... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1948 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051948000100008 |
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| Backer, C.A.. |
| Herbs, rarely climbing or clambering shrubs. Leaves opposite or alternate, exstipulate, simple, entire or obsoletely dentate-serrate. Flowers ♀, unisexual, or partly difformed and neutral, in clusters, heads, racemes, spikes or panicles, solitary or clustered in the axil of persistent bracts, usually bibracteolate. Tepals 3-5, mostly free; bracts, bracteoles and tepals with scarious margins or entirely scarious; bracteoles falling off with the perianth or persistent; perianth usually enclosing the fruit and falling off with it, rarely persistent. Stamens as many as petals and opposed to them, rarely fewer; filaments free, or connate below, or almost entirely united in a cup or tube, with or without interposed dentiform, subulate, linear or short and broad... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532537 |
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| Stephensen, K.. |
| The material on which the present paper is based was collected in fresh- and brackish-water habitats on the islands of the Leeward Group, West Indies, in 1936 and 1937. For completeness sake specimens from brackish water and from some isolated salt-water habitats — already studied by the author (K. STEPHENSEN, 1933a and 1933b) — were included. It seems highly probable that the greater part of the species treated below are also represented in the litoral fauna of the open sea. The occurrence of the species on the various islands may be summarized as follows (see also Table 1.) |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/506030 |
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| Brieger,F. G.. |
| Na aplicação do X2-teste devemos distinguir dois casos : Á) Quando as classes de variáveis são caracterizadas por freqüências esperadas entre p = 0,1 e p = 0,9, podemos aplicar o X2-teste praticamente sem restrição. É talvez aconselhável, mas não absolutamente necessário limitar o teste aos casos nos quais a freqüência esperada é pelo menos igual a 5. e porisso incluimos na Táboa II os limites da variação de dois binômios ( 1/2 + 1/2)n ( 1/4 + 3/4)n para valo r es pequenos de N e nos três limites convencionais de precisão : ,5%, 1% e 0,1%. Neste caso, os valores dos X2 Índividuais têm apenas valor limitado e devemos sempre tomar em consideração principalmente o X2 total. O valor para cada X2 individual pode ser calculado porqualquer das expressôe... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1948 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761948000100002 |
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| Steenis, C.G.G.J. van. |
| Scandent shrubs (often erect in youth), without resin; branches sympodial with a series of circinate woody hooks in one plane. Leaves spread, simple, entire, often rosette-crowded, cuneiform, penninervous, reticulate-veined, glabrous, both surfaces minutely pitted, each pit with a peltate small hair secreting a waxlike substance; petiole articulated, scar on the twigs often saddle-shaped; stipules absent. Flowers ♀♂, actinomorphic small. Inflor. few or several times dichotomous or spike-like, often provided with said hooks and single reduced bract-like leaves, branches often recurved. Pedicels articulated. Bracts with a glandular-thickened base, margin fimbriate-membranous. Calyx tube short, at length adnate to the base of the ovary; lobes 5 inequal... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532536 |
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| Registros recuperados: 268 | |
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