Bragantia

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List of Papers (Total 294)

Conservação de sementes de algodoeiro deslintadas por diferentes métodos

Effects of four delinting methods on the germination and longevity of cottonseeds of the cultivar IAC 13-1, treated and non-treated with the fungicide PCNB 75% were studied. The seeds were stored in uncontrolled conditions at Campinas, State of São Paulo for a period of 21 months. Seeds delinted by gas and treated with fungicide maintained germination rates higher than 80 %, up...

Efeitos da adubação nitrogenada em cana-de-açúcar (cana-planta) em anos consecutivos de plantio. II: resultados de 1976/78 e conclusões finais (1974/78)

Eleven experiments were carried out in four types of soils in the State of São Paulo (Brazil) to study the effects of different levels and times of application of N on cane and sugar production per hectare and kilograms of sugar/ton of cane. The levels utilized were 60, 120 and 180 kg/ha of N (ammonium sulphate), and the times of application were: (a) total quantity at two months...

Variação da composição química de sementes de três cultivares de soja, durante o armazenamento

Chemical analyses were made on seeds of cultivars Santa-Rosa, IAC-1 and UFV-1 which were stored for 12 months under normal storage conditions. The percentage of ether extract and total sugar increased with time of storage, whereas, the percentage of polysaccharides, seed germination and vigor decreased.

Picadas de alimentação de Nezara viridula em cultivares e linhagens de soja de diferentes graus de suscetibilidade

The number of stylet sheaths of Nezara viridula (L., 1758) (Hemiptera: Pentatomidae) in 5 soybean (Glycine max (L.) Merrill) varieties was estimated under greenhouse conditions, at Campinas, State of São Paulo, Brazil. When estimated with naked eyes, the number of stylet sheaths was low in the varieties IAC 73/228 and IAC 77/656, high in the commercial varieties 'Hill' and 'Paran...

Variação do teor de prolina em folhas de feijão em função da disponibilidade de água no solo

The objective of this paper was to verify the accumulation of free proline in leaves of beans (Phaseolus vulgaris L.) when subjected to water stress. Leaves samples were taken at 11 and 15 days after starting the water stress and 4 days after irrigation to estimate the proline accumulation. The results obtained showed differences among bean cultivars in the proline content and...

Linhagem isogênica no feijoeiro para resistência ao fungo da antracnose

An isogenic dry bean line (Phaseolus vulgaris) was developed using Rosinha 1454-10 as recurrent parent susceptible to Colletotrichum lindemuthiamun and Cornell 49-242 as the donor one. Ten backcrosses to the recurrent parent were made. Seedlings in the F1 generation of each backcross and in the F2 and F3 of the 10th backcross were inoculated using a spore suspension containing...

Esverdeamento e brotação em cultivares alemães e holandeses de batata

Nineteen German and five Dutch potato varieties were observed in relation to greening and sprout growth development in the tubers. The Dutch varieties Jaerla and Bintje and the German varieties Atica, Emergo and Topi were less susceptible to greening, but all the others in the second reading, 10 days after light exposition, showed the skin green or very green. Jetta, Broca...

Avaliação da capacidade de troca de cátions em solos utilizando o método do tampão SMP

The cation exchange capacity (CEO of soil determined by the methods of IN calcium acetate at pH 7.0, IN amonium acetate at pH 7.0 and triethanolamine buffered barium chloride at pH 8.2 were compared with results obtained by the SMP buffer method to determine (H + Al) added to the sum of bases to calculate the CEC. The correlations between the results, obtained by the different...

Métodos de analise dos danos da lagarta da espiga¹, em médias de gerações envolvendo IAC Maya e Zapalote Chico

The line Zapalote Chico 2451 (ZC 2451) resistant to the corn earworm, Heliothis zea, the commercial synthetic Brazilian variety IAC Maya XII, the F1 and F2 obtained with their cross, and the two back crosses between the F1 and both parents, were planted in the field in a randomized block with 10 replications. The earworm damage done to the ears was graded utilizing the revised...

Preferência para alimentação de lagartas de Chlosyne lacinia saundersii Doubleday & Hewitson, 1849 em cultivares de girassol

The feeding preference of Chlosyne lacinia saundersii Doubleday & Hewitson, 1849 (Lepidoptera: Nymphalidae) in eighteen sunflower varieties was investigated in two experiments under field conditions, at Campinas, State of São Paulo, Brazil. Varietal differences were evaluated by visually estimating the percentage of foliar area eaten by the caterpillars. The results showed that...

Composição química de amêndoas fermentadas de cacau

During the manufacturing process 10-12% in weight of cacao beans, which consist of seed coat and embryo, are discarded. The above mentioned material has a potential for utilization as animal food and purine base source. Therefore the chemical composition was determined in each part of the beans (seed coat, embryo and cotyledons) after fermentation and drying. The principal...

Rendimento em celulose, densidade básica e dimensões das fibras em sorgo

A study was made with different genetic material of sorghum to determine cellulose yield; basic density and fiber dimension (length, width, lumen and cell wall thickness). The results showed that cellulose yield and basic density of the culms altered significantly among the material. The basic density was smaller after the sugar extraction with hot water. The fiber length (1.51mm...

Maracaí (IAC 17) e Xavantes (IAC 18): cultivares de trigo para o estado de São Paulo

The new cultivars Maracaí (IAC 17) and Xavantes (IAC 18) were selected in the wheat breeding program conducted at Instituto Agronômico. They were studied in the main wheat area of the State of São Paulo, compared with the commercial cultivars BH-1146 and IAC 5, in relation to yield, reactions to stem and leaf rusts and to bread quality. The results showed that the cultivar...

'Precoce de Itupeva

'Precoce de Itupeva' (IAC N 4474-5) and 'Branca de Guapiara' (IAC N 2374-8) are the two new low chilling nectarine selections adapted to the mild winter conditions prevailing in the State of São Paulo. They are the result of the nectarine breeding work started at the Instituto Agronômico, Campinas, State of São Paulo, Brazil, in 1970, with crosses between some local peach...

Ação do fungo Ceratocystis fimbriata Ell. & Halst., isolado de diversos hospedeiros, sobre mudas de cacaueiro

A greenhouse experiment was conducted to determine the pathogenicity of 15 different isolates of Ceratocystis fimbriata Ell. & Halst. in cocoa (Theobroma cacao L.) plants. The isolates were obtained from Cajanus cajans L., Acacia decurrens Willd, Crotalaria juncea L. and Mangifera indica L. Potted cocoa plants (10 months old) representing nine different hybrids were used: SCA 6 x...

Amido a partir de bambu

In bamboo culms of the species reported as Guadua flabellata were determined the contents of starch, fibrous fraction, parenchymatous fractions and water soluble fractions. The height and diameter of the bamboo culms were also determined. The results showed that the average content of extracted starch was 8.53% (over dry material). This content corresponds to about 59% of the...

Método de quadrados: tamanho da amostra em levantamentos de espumas de cigarrinhas-das-pastagens

To estimate the occurrence of spittle bug spumes by the quadrat method, the definition of the number and the size of quadrat to achieve a determined degree of precision is necessary. In five São Paulo State localities (Brazil) areas of one hectare growíng, Brachiaria decumbens (Stapf) were divided into 25 plots measuring 20m x 20m each one. In each of these plots, quadrats of two...

Melhoramento do algodoeiro no Estado de São Paulo: obtenção da variedade IAC 18

The origin and breeding of the cotton variety IAC 18, the involved procedures and numerical results are presented and discussed. The increasing occurrence of bacterial blight Xanthomonas campestres pv. malvacearum in cotton fields of the State of São Paulo, Brazil, motivated cotton breeders of the Agronomic Instituto at Campinas, to program the breeding of a bacterial-blight...

Hibridação interespecífica entre Gossmum hirsutum L. var. latifolium e G. Herbaceum L. var. africanum

Genetic variability was obtained by the authors for fiber strenght in cotton, through hybridization between the cultivated alotetraploid species Gossypium hirsutum L. var. latifolium Hutch. and the wild diploid species G. herbaceum L. africanum Hutch. The underlying methods and the hybrid's characteristics are reported and described. As a first step, the number of chromosomes in...

Um caso de translocação em um híbrido entre Zea mays L. e Z. mexicana (Schrad.) Kuntze

Aheterozygous translocation involving two non homologous chromosomes was observed in a hybrid between Zea mays L. and Z. mexicana (Schrad.) Kuntze. The cytological observations were made at the microspore phase. A cross-shaped synaptic figure formed by the translocated chromosomes was shown at pachytene as well as the chain configurations at diakinesis and ring shaped formations...

Competição de clones de mandioca selecionados para mesa e indústria

Forty cassava (Manihot esculenta Crantz) clones, derived froco several intervarietal crossings, were evaluated, concerning root yields and other characteristics, from 1981 to 1984. Originally, four trials were carried out at Campinas and other four trials in Pindamonhangaba, State of São Paulo, Brazil, in completely randomized block designs with four replications. Each trial had...

Variação na resistência à ferrugem e na composição do óleo essencial de dois clones de menta

Seedlings froco two clones of M. arvensis L var. piperascens Malinvaud were selected by olfative test to eliminate the plants with high pulegone content in the essencial oil; the selected plants were inoculated with spore suspension of Puccinia menthae Pers., and classified in three classes of susceptibility. The blooming plants were distilled and the obtained samples of...

Avaliação do teor de ureídeos em plantas de confrei

The objective of this study was to verify the contents of protein and non-protein nitrogen and ureides (allantoin and allantoic acid) in leaves and roots of comfrey plants (Symphytum officinale L.). The results showed that 12% of the nitrogen was non-protein nitrogen and 28% of which was from ureides. Non-protein nitrogen amounted to 54% of the total nitrogen of the roots, and 71...

Frutificação alternada em caqui cultivar Pomelo (IAC 6-22)

Pomelo, one of the main early persimmon selection developed in the breeding program of the Instituto Agronômico, Campinas, State of São Paulo, Brazil, tends to be alternate bearing, that is the trees tend to yield a high production in one year followed by a low or no production in the next year. This tendency continues in the suceessive years unless some external factor may...

Composição química de grãos de feijao-guandu cultivar kaki

Pigeon pea seeds, cv' Kaki either with light-yellow or orange testa pigments were analysed for protein, ether extract, total sugar and polysaccharides. Similar results were obtained for the two types of seeds. On the average the seeds had the following contents: protein - 23.11%; ether extract - 1.34%; total sugar - 9.46%; polysaccharides - 16.77%. The protein fraction had low...