Bragantia

http://www.scielo.br/scielo.php?script=sci_issues&pid=0006-8705&lng=pt&nrm=iso

List of Papers (Total 294)

O pessegueiro no sistema de pomar compacto: VI. Frutificação efetiva e raleio químico em seleções IAC

This paper reports the fruit set potential and effects of 12% urea on fruit drop in peach and nectarine selections in meadow orchard (5,000 plants per hectare). The experimental plot was located at the Estação Experimental of Monte Alegre do Sul (22°41'S. and 46°43'W.) of the Instituto Agronômico (IAC), State of São Paulo, Brazil, which has a record of 40 hours per year with...

Correlações fenotípica, genética aditiva e ambiental em cenoura

Since development of commercial varieties involves simultaneous selection for various traits, previous knowledge of their interrelationships may also be fundamental to the breeder as the strategies to be adopted. The objective of this research was to estimate phenotypic, additive genetic and environmental correlations for a number of traits of agronomic interest in carrot (Daucus...

Sistema radicular e nutrição da soja em função da compactação do solo

Soil tillage can originate compacted layers in the soil subsurface. This compaction reduces root growth, plant development and eventually soybean yields. This study examined the effects of subsurface compaction on soybean root growth and morphology as related to plant growth and mineral nutrition. Soybean plants cv. Primavera were grown up to 37 days from seedling emergence in...

Comportamento agronômico e avaliação tecnológica dos cultivares de trigo IAC 120 (Curumi), IAC 286 (Takaoka) e IAC 289 (Marruá) para o estado de São Paulo

The wheat cultivars IAC 120 (Curumi), IAC 286 (Takaoka) and IAC 289 (Marruá) were evaluated in relation to (1) grain yield; (2) reactions to the causal agents of leaf and stem rusts (under field and greenhouse conditions); and (3) reactions to the causal agent of leaf spot. The experiments were performed in limed and acid soils, in upland and under sprinkler irrigation, in...

Adubação mineral e orgânica do cafeeiro

The effect of manure and mineral fertilizers with nitrogen, phosphorus and potassium on coffee yield, was evaluated with a 24 factorial experiment, Bourbon Vermelho variety, conducted on a Latosolic B "Terra Roxa" at Ribeirão Preto, and on a Red Yellow Podzolic at Mococa, State of Sao Paulo, Brazil regions. Twelve years of grain productions were analised in three periods of four...

Estabilidade da produção de genótipos de algodoeiro em face da ocorrência de doenças e nematóides

Yield stability of four cotton (Gossypium hirsutum L.) genotypes was studied following the Eberhart & Russel method, based on 13 experiments carried out at growing areas of the State of São Paulo and Goiás, Brazil, in the 1992/93 season. In some of these trials, one or more of the following adversities were present: Fusarium wilt (Fusarium oxysporum f. vasinfectum (Atk.) Snyder...

Aspectos da organografia e anatomia foliar do amendoim: genótipos so-53 e so-909

Leaf morphological studies were made in two genotypes of peanut (Arachis hypogaea L.) of the Valencia group, complementing informations included in previous papers. Peanuts are an important worldwide cultivated crop which has it center of origin in Brazil. No research is known involving studies with the organography and anatomy of the Brazilian genotypes. The genotype SO-53...

Evidência isoenzímica sobre a origem interespecífica do café Piatã

Years ago it was found in a field of Coffea arabica (2n = 44) a coffee tree different from any other known so far. Initially it was thought to be an autotetraploid either of C. liberica (2n = 22) or of C. dewevrei (2n = 22). Morphological and cytological studies of this tree and its progeny, designated by the prefix C387 of the Department of Genetics, IAC and named Piat...

Avaliação da adsorção de boro em solos sob vinhedos na Serra Gaúcha

Boron adsorption was evaluated in soils under vineyards of cv. Concord, in the Serra Gaúcha viticultural region of State of Rio Grande do Sul, Brazil. In 1991, an experiment was carried out with eight soil samples. Different concentrations of boron were added in order to obtain the equilibrium concentration. The maximum boron adsorption for each soil was evaluated using Langmuir...

Nova fórmula para exprimir a maturidade da fibra de algodão pelo método do fibrógrafo modelo 430

A new equation for expressing cotton fiber maturity was adapted to the Fibrograph model 430 method. The new equation express the values of maturity obtained according to international standard scale used for the 18% caustic soda method.

Determinação do ponto de colheita e indução à abertura floral do crisântemo cultivar White Polaris em diferentes concentrações de sacarose

Flowers of spray chrysanthemum cv. White Polaris were cut at 4 stages and treated in pulsing solutions of distilled water plus 0 to 146.1 mol/m3 sucrose. The flowers were harvested in local commercial greenhouses, at various stages of development, and transported to the laboratory. The whole stem and inflorescences were immersed in tap water under the shade, during 3 hours. The...

Cultivares de arroz e idade de mudas para transplantio

This research work was carried out at Pindamonhangaba Experimental Station - Instituto Agronômico - State of São Paulo - Brazil, aiming to evaluate several transplanting seedling ages on subsequent rice development. In the 91/92 and 92/93 growing seasons six seedling ages (25, 32, 39, 46, 53 and 60 days after emergence) were tested in four rice cultivars (IAC-4440, IAC 100, IAC...

Avaliação da resistencia a ferrugem tropical em linhagens de milho

Four hundred and forty maize inbred lines, developed at Instituto Agronômico de Campinas, State of São Paulo, Brazil, derived from several populations, were evaluated, in field conditions, as to tropical rust resistance caused by Physopella zeae. Twenty two experiments were carried out in randomized complete block designs, with two replications each, during 93/94 summer season...

Identificação de parentais e híbridos entre Vitis vinifera e Vitis rotundifolia utilizando polimorfismo enzimático e marcador RAPD

Aiming to identify parents and hybrids among Vitis vinifera (bunch grapes) and Vitis rotundifolia (muscadine grapes) isozyme polymorphism and RAPD marker were used. GOT (glutamate oxaloacetate transaminase), IDH (isocitrate dehydrogenase) and PGI (phosphoglucoisomerase) systems could differentiate the muscadine, being identified five allozymes for GOT, two allozymes for LAP...

Avaliação agronômica e de qualidade tecnológica de genótipos de trigo com irrigação por aspersão no estado de São Paulo

From 1991 to 1993, sixteen wheat genotypes were evaluated in experiments carried out at the different wheat regions of the State of São Paulo, Brazil, under sprinkler irrigation. Grain yield, reactions to the causal agents of leaf rust, powdery mildew and leaf spots and the flour technological quality were evaluated. The genotype TUI"S" presented high productivity and good...

Seca-da-mangueira: XV. Resistência varietal a dois isolados de Ceratocystis fimbriata

The objective of this paper is the resistance evaluation of 15 mango varieties in relation to two isolates of the fungi Ceratocystis fimbriata Ell. & Halst.: the IAC FITO 4905 which is very pathogenic to the variety Jasmim and the IAC FITO 334-1 which is not patogenic to this variety. Field inoculations were made about 40 cm from the branch top, using eight years old trees and a...

Análise da fragmentação de fitomassa realizada por uma roçadora em área com predominância de capim-colonião

The intensity of fragmentation of biomass by a rotary shredder was analyzed according to the size of the cuttings. Prior to shredding, the mass of the green cover per meter square was recorded for 75 equally spaced 1m2 areas. After the operation, the lengths of 100 fragments of the cut material were taken from the same 75 1m2 area samples. Data was processed using descriptive...

Avaliação de clones de híbridos IAC de cana-de-açúcar, série 1985, na região de Jaú (SP)

Ten sugarcane clones obtained from crossings carried out in 1985 in Camamu, State of Bahia, were evaluated in a trial in the Jaú region, State of São Paulo, Brazil. The trial started in February, 1991 and used a complete randomized block design with six replications. Statistical analyses for cane and sugar yield (t/ha) and sugar content (pol % cane) were performed with four...

Resistência de linhagens avançadas de tomateiro a tospovírus

Tomato advanced lines, obtained in the IAC breeding program, were recently evaluated, under different Brazilian states producing areas to tospovirus reaction, fruit yield and soluble solid contents. In the growing season 95/96, IAC S4-3, IAC S4-4, IAC S4-13 and IAC S4-17, behaved as tospovirus resistant in Campinas, State of São Paulo, and Petrolina, State of Pernambuco; IAC S4...

Remoção de material erodido dos solos de pequenas bacias hidrográficas no Parque Estadual da Serra do Mar em Cubatão (SP)

The main aim of this research work has been to analyse the evolution of soil cover alteration at Serra do Mar State Park, Cubatão, State of São Paulo, Brazil. Through quantitative analyses, we have tried to identify the degrees of evolution and fragility of fifteen third order watersheds, aim at predicting and reducing the erosion process. The higher the relief ratios obtained...

Seleção precoce para a produtividade de grãos no feijoeiro

The objective of this study was to evaluate the efficiency of the early selection of common bean (Phaseolus vulgaris L.) grain yield. 192 families from the cross 'Carioca' (P1) x 'FT-Tarumã' (P2), which 64 from F2 generation and 128 from F2 of the backcrosses (64 of the BC1 and 64 of the BC2) were assessed. These families were conducted by within F2 family bulk breeding and...

Caracterização de germoplasma de soja e de feijão através de eletroforese de isoenzimas da semente

Seed isoenzymes of two soybean cultivars, IAC 6 and IAC 9, and two lines of the bean cultivar Goiano Precoce, one with smooth leaves and the other with wrinkled leaves, were studied through electrophoresis. The plants of soybean cultivars differed for the isoenzymes urease, acid phosphatase, malic dehydrogenase and leucine aminopeptidase. The results indicate that the two...

Avaliação do pH da rizosfera de genótipos de café em resposta à toxidez de alumínio no solo

This work was carried out in greenhouse aiming to evaluate the relationship between rhizosphere-pH and aluminum tolerance of five coffee genotypes, grown with or without soil liming. Coffee plants were grown in plastic boxes, with roots developing near the cover. After 90 days the lids were removed and a solid agar layer with pH indicator was placed on the surface of soil and...

TEMPERATURA DO AR NO INTERIOR DO CANAL DE CULTIVO E CRESCIMENTO DA ALFACE EM FUNÇÃO DO MATERIAL DE COBERTURA DA MESA DE CULTIVO HIDROPÔNICO - NFT

This work was performed to study the effect of different types of covering material on the air temperature inside the cultivation channel and on the growth of lettuce (Lactuca sativa L.), plants cv. Verônica using closed NFT-hydroponics system. Two types of cover material were used: black and white double-faced plastic sheet and Tetra-Pak™. Uncovered polypropylene tubes were used...

EFICACIA DE CUATRO EXTRACTANTES EN LA EVALUACIÓN DE LA DISPONIBILIDAD DE COBRE PARA MAÍZ Y SOJA

This study was conducted in a greenhouse with the purpose of comparing the efficiency of Mehlich-3, Mehlich-1, DTPA and AB-DTPA extractants in assessing Cu availability for maize and soybean. For the experiment with maize, 61 topsoil samples from different representative sites of São Paulo State were utilized, whereas for the soybean experiment 59 topsoil samples were employed...