|
|
|
| Registros recuperados: 195 | |
|
| |
|
|
| Moraes,J. Mello; Almeida,J. R.; Coury,T.; Gomes,F. Pimentel; Valsechi,O.; Ranzani,G.; Kiehl,E. J.. |
| Considering the economic importance of the sugar industry among ourselves, the authors carried out a field experiment (Latin square) with Co 290 sugar cane, on a white sandy soil of Piracicaba, State of São Paulo, Brazil, applying NaCl in increasing rates (from 6.8 to 54.5 grams per plant), in order to study the effects of chlorides, on productivity and on the composition of juice. No toxic or stimulating effect was found, and there was no change in yield, in degree of purity of the juice, in general aspect of plants or in colour of leaves and culms. No difference was observed between potassium sulphate or chloride, as source of potash for sugar cane culture. Data collected and the literature cited suggest: (a) that the use of the variety Co 290 is... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100008 |
| |
|
|
| Gurgel,J. T. A.; Soubihe Sobrinho,J.; Malavolta,E.; Leme Júnior,J.. |
| In the present paper the authors deal with the content of ascorbic acid in guavas (Psidium guajava L.) and the methods of sampling used. Ascorbic acid was determined directly in the photoeletric colorimeter (EEL), after extraction with a 4 per cent solution of oxalic acid. Guavas from various parts of State of S.Paulo were used and the general mean found was around 100 mgm of ascorbic acid per 100 gm fresh weight of the material used for extraction. It was found that there is great variation in the ascorbic acid content according to the condition of the fruit: Ascorbic acid Condition content in Mean mgm/100 gm Green and hard 93,36 - 119,54 102,43 Small green 57,34 - 92,30 83,40 Firm ripe 71,28 - 115,98 90,32 Overripe 63,22 - 85,98 77,36 Of the diferent... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100019 |
| |
|
|
| Brieger,F. G.. |
| 1) Inicialmente foi dado um breve resumo dos métodos básicos do melhoramento no milho os quais podem ser reunidos em dois grupos principais: o processo do milho híbrido, com as suas variantes, e os processos dos sintéticos. Estes últimos podem ainda ser subdivididos em duas categorias: os sintéticos simples e os sintéticos balançados. Na obtenção dos sintéticos simples toma-se inicialmente em consideração a capacidade combinatória das linhagens a serem misturadas, e se executa em cada geração de sintético uma seleção massal de conservação. Nos balançados devemos acrescentar uma forte seleção, na fase preparatória, contra todos os híbridos que dão segregações mendelianas fortes demais. 2) No curso de um breve resumo histórico ficou evidente que a idéia de... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100031 |
| |
|
| |
|
| |
|
|
| Kerr,Warwick E.. |
| This paper deals with problems on population genetics in Hymenoptera and particularly in social Apidae. 1) The studies on populations of Hymenoptera were made according to the two basic types of reproduction: endogamy and panmixia. The populations of social Apinae have a mixed method of reproduction with higher percentage of panmixia and a lower of endogamy. This is shown by the following a) males can enter any hive in swarming time; b) males of Meliponini are expelled from hives which does not need them, and thus, are forced to look for some other place; c) Meliponini males were seen powdering themselves with pollen, thus becoming more acceptable in any other hive. The panmixia is not complete owing to the fact that the density of the breeding population... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100014 |
| |
|
| |
|
| |
|
|
| Gurgel,J. T. A.; Soubihe Sobº,J.. |
| 1 - This paper is a joined publication of the Dept. of Genetics, Escola Superior de Agricultura "Luiz de Queiroz", University of São Paulo, and Secção de Citricultura e Frutas Tropicais, Instituto Agronômico, de Campinas, and deal with the number of seed per fruit and the polyembryony in Citrus, with special reference to the pummelos (C. grandis). 2 - For C. pectinifera, hibrid limon x acid lime, C. histrix and Citrus sp. the mean of seeds per fruit is 5,8 - 17,3 - 30,2 -94,6; for 14 pummelos the average was 100 and the range of variation 11 to 185 seeds per fruit. For the four above mentioned Citrus the cotyledons were classified into 3 types: big (near 8 mm.), medium (near 6 mm) and small (near 4 mm) and for the pummelos there was only one size of... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100029 |
| |
|
| |
|
| |
|
|
| Lordello,Luiz Gonzaga E.. |
| This paper is a small contribution to the knowledge of some species of brazilian Ithomiidae (Lep., Rhop.). The Author, during the year 1950, had an oportunity to study the development of the following species: Mechanitis lysimnia Fabr. Mechanitis polymnia casabranca Hsch. Dircenna dero Hübn. Methona themisto (Hübn.) The three first species live, in Piracicaba (State of São Paulo, Brasil), on Solanum variabile Mart., damaging its leaves, Mechanitis polymnia casàbranca being a serious enemy of this medicinal plant. The Author presents some notes on the biological cycle of M. lysimnia, which confirm D'Almeida's observations. Methona themisto is an old pest of Brunfelsia hopeana Benth. In Argentine, according to Hayward's observations, it occurs on Brunfelsia... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100006 |
| |
|
| |
|
|
| Jardim,W. R.; Peixoto,A. M.. |
| In this note the A. A. relate the occurrence of a possible sub-lethal factor, on the Holstein-Friesian herd of Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba. The sire Horto was mated with his own mother, Brisa, and so, were obtained two calves, a male and a female, consecutively. Both the calves presented flexion and deviation of the fore legs. The sire's death has not alloved further observations. The study of these history cases excludes the mother's nutritional deficiency, as the cause of related phenomenon. In the consulted literature, VEIGA and MEAD et al. relate similar cases, although these are observed in other breeds of cattle The A. A. admit that cause of occurrence is a possible sublethal recessive factor, put in evidence by... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100017 |
| |
|
|
| Montenegro,Heitor W. S.; Krug,Helmut Paulo. |
| In order to study the action of herbicides - sodium salt, amine salt and ester of 2,4-D, TCA and 2,4,5-T a preliminary experiment for pre-emergence weed control was corried out, and the corresponding results are given in table I and II. The corn used in the experiments was of the flint type 1A 3531. The loam soil on which the experiment has been carried out is called "terra roxa". All treatments were highly significant when compared with the check plots, except the 2B one in the control of broad leaf weeds, and 4B in the control of grass weeds. Among these treatments there are no significant differences. But we note the following: (table I). a) treatments of higher concentrations were superior to lower ones. b) the treatments which gave the best control... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100016 |
| |
|
|
| Gomes,Frederico Pimentel; Malavolta,Eurípedes. |
| Statistical analyses of an experiment on wheat were carried out with the aid of Mitscherlich's law. The experiment was made in Ponta Grossa, Paraná, by the Ministry of Agriculture of Brasil. Lime, in the form of Ca(OH)2, was applied at the levels of 0, 2, 4, 6 and 8 metric tons per hectare. A 5 x 5 Latin square was used. Lime was applied in 1940 and wheat was cultivated in the same plots for several years. The following fertilizers were annually used for all plots: NaNO3 100 kilograms per hectare, Superphosphate 350 kilograms per hectare, K2S04 80 kilograms per hectare. The statistical analysis of the data collected in 1941, 1942, 1943, 1947 and 1948, carried out in accordance with the methods previously introduced by Pimentel Gomes and Malavolta (1949 a,... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100001 |
| |
|
|
| Bergamin,Armando. |
| Foram tomados 2 lotes de pintos Rhode Island Red de 40 dias de idade que foram submetidos, o lote A a uma alimentação com ração sem proteina de origem animal, na qual a farinha de carne foi substituida por igual quantidade de farelo de torta de sementes de algodão, e adicionada à mesma 2 quilos de excremento de vaca, colhido fresco, secado ao sol e triturado; o lote B, que serviu de testemunha continha os mesmos ingredientes, com exceção de excremento de vaca e da torta de algodão, em lugar da qual figurava a farinha de carne. Alimentadas durante 6 semanas as aves se comportaram de maneira idêntica, acusando as do lote A um aumento leve e progressivo do peso médio, embora sem diferença estatística. O excremento de vaca foi satisfatório e supriu as... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100025 |
| |
|
|
| Lordello,Luiz Gonzaga E.. |
| A short contribution to the Natural History of some Brazilian Frigillidae The following species of Brazilian Fringillidae are mentioned here, the first of which being more deeply studied: 1 - Oryzoborus angolensis angolensis (Linnaeus). 2 - Oryzoborus crassirostris maximiliani Cabanis. 3 - Cyanocompsa cyanea sterea Oberholser. 4 - Coryphospingus cucullatus rubescens (Swainson). About each one of the referred species, the Author gives native names, some datas and observations on its reproduction and behaviour under captivity, as well as on its natural alimentation. Some considerations about the geographical races of Oryzoborus angolensis: O. a. angolensis (Linnaeus) and 0. a. torridus (Scopoli) -are also made. Both the races occur in Brasil and, according... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100022 |
| |
|
|
| Torres,A. P.; Graner,E. A.. |
| The AA. have studied, in this paper, the correlation of egg production in yearling R. I. R. pullets and the difference between the pelvic bones, an between the pelvic bones and keel. The distances between those bones were measured by the fingers. It was suggested an index = spread of pelvic x spread of keel bone. These three data were compared with the last 30 days production and with the production to date - six months. Comparisons have been made with 285 pullets. The AA. have concluded: (a) there is a positive correlation between the spread of the pelvic bones and the last 30 days (r = + 0,23 and pr = + 0,16); (b) there is not correlation of the distance between the pelvic bories to the keel and the last 30 days (r = + 0,11 and pr = - 0,01; (c) there is... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100028 |
| |
| Registros recuperados: 195 | |
|
|
|
