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| Registros recuperados: 98.244 | |
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| Normanha,Edgard S.; Boock,Olavo J.. |
| In the present work were studied several varieties of manihot of the Ubatuba area on the north coast of the State of São Paulo. The experiments were carried out at the Experiment Station of that locality with a view to compare the production of roots and meal of each variety with that of the variety "Vassourinha", introduced in that district in 1938 by the Division of Roots and Tubers of the Instituto Agronômico. Said variety ("Vassourinha") is the most cultivated all over the State of São Paulo. Results have shown that among the eleven varieties studied the following exceeded the others as regards production of roots and meal: N.° 1 ("Vassourinha") and N.° 120 ("Santa"). Comparing these two one with another, it was found that N.° 1 surpassed N.° 120, not... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942001200004 |
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| Graner,E. A.. |
| The inheritance of two characters in Manihot utilissima Pohl were studied. It was found that the leaves with narrow lobes V (Fig. 1) are dominant over leaves with large lobes v (Fig. 2) and that the brown coloration of the roots M (Fig. 5) is dominant over white m (Fig. 6). These two characters segregate independently, according to the dates recorded in tables III and IV. The phenotypic expression of the form of the leaves is largely dependent from the environment, the leaves with narrow lobes being replaced by leaves with large lobes in plants transported to a shady place under big trees. (Figs. 3 and 4). Thus reduction of light causes a change of dominance. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000100002 |
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| Krug,C. A.; Mendes,P. Teixeira. |
| In the introduction to this article data are presented to show the growing economic importance of the cultivation of Ricinus in Brasil and particularly in the State of São Paulo. Following general statements regarding the botany, the origin and the geographic distribution of this genus, the investigations are outlined which are carried out by the Divisions of Genetics and Oil Plants of the Instituto Agronômico of the State of São Paulo, Brasil, to improve this important crop plant. Summarising, these investigations deal with the following subjects : a) Organisation of a large collection of types ; b) Investigations concerning the variability of the genus Ricinus c) Genetic analysis; d) Regional variety trials ; e) Improvement of the best varieties by... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000500001 |
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| Krug,C. A.; Carvalho,Alcides. |
| Em artigos anteriores (1, 2) os autores demonstraram que a cor amarela dos frutos e a coloração bronzeada das folhas novas são, em Coffea arabica L, controladas, cada uma, por um único par de fatores genéticos (respectivamente xc xc e Br Br). Os híbridos F1 no primeiro caso com plantas de frutos vermelhos, e no segundo com plantas de folhas novas verdes, demonstraram tratar-se de casos em que há dominância incompleta nesta geração, os frutos híbridos possuindo uma coloração vermelho clara e as folhas novas se apresentando com uma tonalidade bronze clara. Como algumas das hibridações realizadas envolviam, ao mesmo tempo, os dois caracteres em questão, apresentou-se a oportunidade para constatar se havia ou não independência entre os dois pares de fatores... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000600002 |
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| Costa,A. S.; Forster,R.. |
| The present paper deals with the virus disease of the tobacco plant recently described by Kramer & Silberschmidt (12) under the name "faixa das nervuras" (veinbanding). New host plants are added to the list of suscepts, as follows : Nicotiana repanda Willd., JV. angustifolia (*), N. Gossey Domin, N. Sanderae Hort. ex. W. Watson, N. glutinosa L., N. longiflora Cav., N. paniculata L., Lycopersicon esculentum Mill., L. pimpinellifolium Mill., and Cyphomandra betacea Sendt. Datura stramonium L., already studied by Kramer & Silberschmidt (12) and Nicotiana glauca Grah., Nicandra physaloides Gaertn., Solanum nodiflorum (**), S. nigrum L., Lactuca sativa L., Brassica oleracea L., Vigna sinensis Endl. var. Black., and Dolichos lablab L., var.... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000200002 |
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| Paiva Neto,J. E. de. |
| The present work is a study of Vageler's formula y =x.S/ x+y.S for the determination of the final value of the reaction of the cation change in the sorptive complex of the soil. The author took the changeable H+ of the soil as a cation to be examined. Samples studied by the author belong to a chain (a series of soil profiles with 5 horizons each) taken from the original red soil ("terra roxa") of the Ribeirão-Preto Experiment Station. In these samples, as a rule, H+ changed could be considered = T - S, because the Al changed, as far as it existed, was traced in very low percentage, as can be seen in table I. For the determination of T - S, the author used a solution of (CH3COO)2Ca N/l (normal calcium acetate). As a mean of extraction, the percolation of... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000900003 |
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| Krug,C. A.; Mendes,P. Teixeira. |
| Ninety six varieties of Ricinus communis, L. were studied as for their growth habit, height, length and number of internodes from the base of the plant to its first inflorescence, types of branching, color of branches and various characters of leaves, inflorescences, fruit clusters, fruits and seeds ; earliness ; yielding capacity and porcentage of oil in the seeds. The description of several of the quantitative characters is supplemented by numerical data, which are also presented graphically. The extreme variability of Ricinus offers excellent opportunities not only for genetical studies but also for breeding new and better varieties for cultivation. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000500002 |
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| Krug,C. A.; Carvalho,Alcides. |
| No presente artigo os autores apresentam os resultados da análise genética referentes à hereditariedade das cores verde, bronze claro e bronze escuro das folhas novas de Coffea arabica L. Baseados em extensos dados de autofecundação, hibridação (F1 e F2) e back-crosses conclue-se que apenas um par de fatores alelomorfos Br-br é responsável pelo aparecimento daquelas cores, br br constituindo o tipo verde, Br br o bronze claro e Br Br o bronze escuro; a coloração bronze escuro é, pois, incompletamente dominante sobre o verde, o Fi entre estes tipos se apresentando de uma tonalidade bronze-clara. No grupo dos bronze-escuros (homozigotos) existe certa variabilidade na expressão máxima da coloração o que, em parte, é atribuido à presença de fatores genéticos... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000600001 |
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| Jensen,Henry Wilhelm. |
| 1. New chromosome numbers have been determined tor the following species from material collected in various counties of North Carolina, U . S . A. Thalictrum clavatum n = 7 Th. dioicum n = 14 Th. polygamum n = 42 Th. coriaceum n = 70 Ilex decidua n = 20 I. monticola n = 20 I. vomitoria n = 20 I. opaca n = 18 I. verticillata n = 11. New chromosome numbers have been determined tor the following species from material collected in various counties of North Carolina, U.S.A. Thalictrum clavatum n = 7 Th. dioicum n = 14 Th. polygamum n = 42 Th. coriaceum n = 70 Ilex decidua n = 20 I. monticola n = 20 I. vomitoria n = 20 I. opaca n = 18 I. verticillata n = 18 2. The genus Thalictrum has been rather well investigated cytologically but the genus Ilex has not yet... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1943 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051943000800002 |
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| Ramos,Ismar; Morais,Mário Vieira de. |
| 1. Comparam-se os resultados de produção de linhagens de algodão provenientes das variedades Delfos 719 e Stoneville 2B com a variedade comercial I. A. 7387 (testemunha), na Estação Experimental de Ribeirão Preto durante 5 anos (1937/38 a 1941/42). 2. Observou-se grande variação anual de produção durante este período de experiências, com predominância de anos de produções inferiores. 3. Verificou-se que o número de capulhos formados é correlacionado com a quantidade e distribuição das chuvas no período de florescimento do algodoeiro, sendo que o excesso de chuvas nessa época é fator preponderante para redução da safra, provavelmente por causar aumento do "shedding". 4. Em 1937/38 uma mistura de linhagens Delfos produziu estatisticamente mais que a... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1943 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051943001200001 |
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| Bacchi,Osvaldo. |
| In order to study the susceptibility of the various stocks with regard to the new disease "tristeza" ("sadness"), a quick and acurate identification of the stock is required. In orchards this cannot be done in most cases as stocks do not always exhibit sprouts and on account of erroneus information frequently given by owners. We have tested the colorimetric identification, already employed in other countries. This identification is based on the differences of color obtained in the watery extract cf the bark taken from the trunk or from the root, when treated by special reagents. The results obtained are somewhat different from those described by the authors of the method. This is perhaps due to variation in environmental conditions. Only the Almen and... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1943 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051943000700003 |
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| Medina,J. C.. |
| Sisal (Agave sisalana Perrine) growing in various localities of the State of São Paulo is often heavely damaged by "leaf basal necrose", whose symptoms are identical with the "leaf foot disease" reported from Java, East Africa and Belgian Congo. The affected leaves show in the initial stages small spots of black, slightly shrivelled tissue on the lower part of the leaf. These gradually spread out. During the later stages the affected leaves bent over at this point. Only approximately mature leaves of plants between 18 to 30 months old are affected. This disturbance was first observed in Anapolis, Araraquara and Campinas. It was thought to be due to K deficiency in the soil. In order to prove this a small fertilizer experiment was established at Campinas... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1943 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051943000400002 |
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| Krug,C. A.; Viégas,G. P.; Paoliéri,L.. |
| Na presente publicação apresentam-se os detalhes de 10 anos de trabalhos realizados pela Secção de Genética do Instituto Agronômico com a finalidade de criar variedades híbridas de milho. Discorre-se sôbre a natureza do material básico utilizado, discutindo-se a seguir os vários métodos em uso visando o isolamento e a seleção de linhagens puras, métodos de hibridação e de estudos de híbridos. No capítulo principal apresentam-se, ano por ano, os detalhes dos serviços executados, acrescentando-se alguns comentários sôbre os resultados obtidos. Para o isolamento de linhagens pela autofecundação foram utilizadas até agora 17 variedades e também alguns híbridos e tipos diversos, realizando-se neste período mais de 26.000 autofecundações artificiais. Procurou-se... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1943 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051943001100001 |
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| Gutmans,M.. |
| Physico-chemical and mineralogical studies of the soils of the São Paulo State by the Soil Division of The Agronomical Institute proved the existence of different violet soils in South-Brasil and its origin from basaltic rocks. The Brasilian denomination "terra roxa" is already many times translated to "red soil", which is inexact, because the colour "roxa" corresponds to "violet" in English. We must insist on the perfection of Brasilian expression, which gives the shortest and the best characteristic of the true violet soil, derived through the decomposition of basalts and diabases in the São Paulo State. The term "red soil" originated much confusion, because there are in this state many "red soils" of different origins, but the true violet soil is quite... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1943 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051943000900001 |
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| Brieger,F. G.. |
| 1) It may seem rather strange that, in spite of the efforts of a considerable number of scientists, the problem of the origin of indian corn or maize still has remained an open question. There are no fossil remains or archaeological relics except those which are quite identical with types still existing. (Fig. 1). The main difficulty in finding the wild ancestor- which may still exist - results from the fact that it has been somewhat difficult to decide what it should be like and also where to look for it. 2) There is no need to discuss the literature since an excellent review has recently been published by MANGELSDORF and REEVES (1939). It may be sufficient to state that there are basically two hypotheses, that of ST. HILAIRE (1829) who considered... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1944 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761944000100011 |
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| Registros recuperados: 98.244 | |
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