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| Registros recuperados: 472 | |
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| Barros,Myrthes Apparecida Adâmoli de. |
| No presente trabalho focalizamos o discutido problema da origem ou formação das domácias, escolhendo, inicialmente, as principais variedades de Coffea arabica L.. Na revisão da literatura, procuramos nos cingir unicamente à bibliografia que trata do assunto em aprêço. Apreciando convenientemente o problema da origem, duas hipóteses foram aventadas pelos autores para explicar a formação das domácias: l.ª) causada por insetos ou por ácaros (LUNDSTRÖEM e outros). 2.ª) caráter hereditário (CHEVALIER). Ambas as hipóteses foram consideradas com o objetivo de aclararmos o problema e concluimos, com CHEVALIER, que se trata de um caráter hereditário. O material constou de sementes, e de ramos com fôlhas de várias idades de cafeeiros que vieram das coleções vivas do... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100014 |
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| Catani,R. A.; Pellegrino,D.. |
| This paper deals with a modification in the solubilization technique of natural phophates in the 2% citric acid solution. The proposed technique is as follows: 2,5 g of phosphatic material and 250 ml of 2% citric acid solution, in a 500 ml Erlenmeyer flask, are shaken for 30 minutes at 30-40 rpm. The phosphorus (P2O5) was determined by the usual method. The data obtained were compared with the conventional technique in which a Stohmann bottle is used. The natural phosphates used were: Phosphorita de Olinda (Pernambuco), Flórida Phosphate (USA) and Hiperphosphate (África). Statistical analysis was applied to the data and the following conclusions were arrived at: a) The precision is equivalent in both techniques. b) There is no significant variation between... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100022 |
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| Joly,S.. |
| Among 327 strains of Actinomycetes isolated in 1958 during the four seasons, 97,85 per cent had proteolytic activity. Most of the strains wete isolated in spring time. About the organic matter no conclusions were reached, because it was mantained constant with a average value of 4.099. So the different number of the strains was a consequence of the season. We can conclude that the Latosol red-yellow soil, from where these microorganisms were isolated, has a strong proteolytic capacity, since this reaction is very strong in a maximum limit of sixteen days during the spring season. Consequently, this soil has one of the most importante caracteristics of fertility. The role of the Actinomycetes in the soil is so important of the soil microflora. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100012 |
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| Nogueira,Iszaias Rangel. |
| The present paper shows that the sum of two binomial integrals, such as A ∫ x p (a + bx q)r dx + B ∫ x p (a + bx q)r dx, where A and B are real constants and p, q, r are rational numbers, can, in special cases, lead to elementary integrals, even if each by itself is not elementary. An example of the case considered is given by the integral ∫ x _____-___ 3 dx = 1/2 ∫ x-½ (x - 1)-⅓ dx - 6 √ x ³√(x - 1)4 = 1/3 ∫ x-½ (x - 1)-¾ dx On the rigth hand side of the last equality both integral are not elementary. But the use of integration by parts of one of them leads to the solution: ∫ x _____-___ 3 dx = x½ (x - 1)-⅓ + C. 6 √ x ³√(x - 1)4 |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100002 |
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| Accorsi,W. R.; Haag,H. P.; Mello,F. A. F. de; Brasil Sobrinho,M. O. C.. |
| The present work was carried out in order to study: (1) The symptoms of deficiency of macronutrients (N, P, K, Ca, Mg, S) in guava (Psidium guajava L.). (2) The modifications induced by those treatments in the histological make up of the leaves. Young guava plants were grown in nutrient solution two treatments being used, namely: complete solution (HOAGLAND and ARNON, 1950), deficient solution, in which a given element was ommitted. The main conclusions can be summaryzed as follows. a) Symptoms Clear cut symptoms of malnutrition were observed in the treatments: -N, -P, -Ca, -K, -Mg, and -S. The signal - stared respectively for deficient level. b) Histological effects Usually the characteristics of the chloroplasts were affected: loss of the green and... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100001 |
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| Zagatto,A. G.; Gomes,F. Pimentel. |
| The authors discuss from the economic point of view the use of a few functions intended to represent the yield y corresponding to a level xof the nutrient. They point out that under conditions of scarce capital what is actually most important is not to obtain the highest profit per hectare but the highest return per cruzeiro spent, so that we should maximize the function z = _R - C_ = _R_ - 1 , C C where R is the gross income and C the cost of production (fixed plus variable, both per hectare). Being C = M + rx, with r the unit price of the nutrient and Af the fixed cost of the crop, wo are led to the equation (M + rx)R' - rR = 0. With R = k + sx + tx², this gives a solution Xo = - Mt - √ M²t² - r t(Ms - Kr)- _____________________ rt on the other hand,... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100016 |
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| Lordello,Luiz Gonzaga E.. |
| In the State of S. Paulo, Brazil, squash plants (Cucurbita spp.) are attacked by the Javanese nematode (Meloidogyne javanica) and by M. incognita acrita. Squash belongs to that group of plants in which the root-knot nematodes break through the root surface, so that the egg-producing females protrude from the root, showing yellowish or brow nish egg masses attached to them. Washed roots show numerous small dark spots, each corresponding to an ootheca, which is adhering to a mature female. A curious abnormal female of M. i. acrita was obtained from a sample of squash roots. This female's body showed two globular parts, separated by a deep constriction. The convoluted ovaries were found to fill both portions of the body. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100030 |
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| Catani,R. A.; Pellegrino,D.. |
| Phosphate "fixation" is the convertion of soluble into insoluble phosphate in the soil. There are many factors conditioning phosphate fixation by soil such as reactions originating less soluble compounds (phosphates of iron, aluminum, calcium, magnesium, etc.), PO4-3 adsorption by the colloidal fraction of soils, PO4-3 absorption by the soil microflora, etc. Certain soils of the state of São Paulo (Brazil) are relatively rich in both iron and aluminum oxides. PO4-3 fixation, using P31 and P32 has been verified by researchers, specially with "Terra Roxa". The known methods for fixation evaluation are conventional as this depends on phosphate solution concentration, pH, time of contact between soil and solution, relation of sample weight to solution volume,... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100003 |
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| Santos,J. M.; Simão,S.; Petta,A.. |
| In the field of agrometeorological studies we are in need of the estimation of the solar radiation frequently. At the present study the authors have worked out some dat:t regarding the hours of sunshine during the months of August, September, October, November, December and January of 1957, 1958 and 1959. Based on such hours of sunshine in the Agrometeorological Station, located at the Escola Superior de Agricultura "Luiz de Queiroz" - U.S. P., in Piracicaba, the authors calculated the solar radiation received on a plane and horizontal surface, from the method proposed by Glover and Mc Culloch. With those results the authors estimated the percentual part of radiation that would be received on vertical wall facing north. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100026 |
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| Boock,O. J.; Lordello,Luiz Gonzaga E.. |
| The writers report results on the application of four fumigants (D. D., E. D. B.-40, C. B. P. and Vapam) for control of root-knot and meadow nematodes attacking potato in beds filled with soil artificially inoculated. The data obtained were as follows: a) as reported by previous authors, potato is sensitive to C.B.P., the toxical effects of which disapearing only about 6 and half months after application. On the other hand, C.B.P. proved to have a significative residual nematicidal value, protecting the seeds from root-knot nematodes for a period of two years; b) D. D., E. D. B., and Vapam were effective for controling root-knot but with no residual value, having to be used prior to each planting; c) at the rates used, no nematicide was effective to... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1960 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761960000100015 |
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| Registros recuperados: 472 | |
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