Bragantia

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List of Papers (Total 294)

Calagem para a sucessao batata-triticale-milho usando calcários com diferentes teores de magnésio

The experiment started in 1981 on a Pachic Haplumbrept, Urutu soil unit of the Itararé Experimental Station, State of São. Paulo, Brazil. The treatments consisted of three limestones, with different magnesium contents (7.5, 16.0 and 21.7%0 of MgO) applied in amounts corresponding to 0, 3, 6, 9 and 12 t/ha. The three crops were grown in sequence. A significant response to liming...

Classes padrões de maturidade da fibra do algodoeiro na determinação pelo método do Fibrógrafo

Once the Fibrograph method to determine maturity in cotton fiber was adopted at the Instituto Agronômico (Campinas, State of São Paulo, Brazil), the need of specifïc standard limits for the several classes of maturity, based on this process, was recognized. In effect, despite of the observed correlation between the results obtained by this method and those revealed by the NaOH...

Redução da evaporação de gotículas contendo herbicida, com emprego de oxietileno docosanol

This experiment was conducted to test the use of oxiethylene docosanol (O.E.D.) to reduce the loss of water during the spray of contact herbicide (bentazone). The droplets were produced under controlled conditions of temperature, relative humidity and absence of wind. The loss of volume was calculated by measuring the reduction of droplet diameter after a fall of 4.2m. When the...

Crescimento diferencial de linhagens de milho em solução nutritiva com baixo nível de potássio

Two experiments were conducted in the Experimental Station of Campinas, Instituto Agronômico, State of São Paulo, Brazil, in 1983, under greenhouse conditions, in order to evaluate and select efficient corn (Zea mays L.) inbred lines in the uptake and use of potassium in nutrient solution. In a first trial, six lines were grow n with 20, 40, 60, 80 and 100 mg K/liter, up to...

Comportamento de híbridos de cebola nas condições de Monte Alegre do Sul, SP

A study was carried out at the Monte Alegre do Sul Experiment Station, State of São Paulo, Brazil (22°42'S), to evaluate five short day marketable onion (Album cepa L.) hybrids (Granex 33, Granex 429, Baia Ouro AG-55, Baia Ouro AG-55R and Baia Ouro AG-59) and five short day experimental onion hybrids (FMX-151, FMX-179, FMX-181, FMX-182 and FMX-183) from different origins. The...

Produção e tolerância à seca de cafeeiros

Progenies derived from crosses among India and Africa accessions and Catuai and Mundo Novo cultivars of Coffea arabica were evaluated as to yielding potential and drought tolerance, in two experiments located at the Experimental Center of the Instituto Agronômico, Campinas, State of São Paulo, Brazil. Yield data from 13 continuous harvests as well as from four-year-drought...

Avaliação da atividade da lipoxigenase em linhagens de soja

Seed of soybeans, Glycine max L. (Merrill), cultivar IAC-8 and lines A-5, low linolenic acid content, PI 408251, lacking L1 mutant, PI 86023, lacking L2 mutant, Tohoko nº 74, lacking L3 mutant, and F2 population from the crosses between IAC-8 and mutant lines (lacking L1, L2 and L3) were analysed for linolenic acid content, lipoxygenase activity and identification of mutant lines...

Competição de adubos fosfatados no algodoeiro, em ensaio de longa duração

After four years of consecutive applications of fertilizer mixtures containing P with or without S, in a long term trial conducted with cotton, on an acid and low-fertility Dusky Red Latosol, velvet bean (Stizolobium atterrimum Piper & Tracy) was cultivated and limestone enough to attain the soil pH around 6.2, was applied. During the next five years, from 1978 to 1983, IAC 18...

Resistência de soja a insetos: VIII. IAC 78-2318, linhagem com resistência múltipla

The performance of the soybean line IAC 78-2318 in relation to oviposition and colonization by the whitefly Bemisia tabaci (Genn.) and to defoliation by caterpillars and chrysomelidae was studied in comparison to other varieties. At Campinas, State of São Paulo - Brazil, in greenhouse, the cultivars Santa Rosa, Paraná, BR-1, Bossier, IAC 8 and IAC 12, and the lines IAC 73-228...

Produção conjunta de fibras celulósicas e etanol a partir do bambu

In this study with Bambusa vulgaris Schrad, a new process of bamboo utilization was established to produce cellulosic fibers for papermaking and ethanol. The yields of ethanol and cellulosic fibers were determined in function of culm age (1, 3 and 5 years) and portion of sampling in each culm (base, middle and top). The yields of cellulosic fibers, ethanol and compounds like...

Mutante somático sem sementes em videira 'Niagara Rosada

A somatic mutation occurred in 1982 in the Niagara Red, the main table grape cultivars in the State of São Paulo, Brazil, is reported. The mutant shows the same berry color as the original one but its physical dimensions were drastically reduced: bunch weight (237%) and berry weight (218%); bunch length and width (33 and 70%) and berry length and width (58 and 43%). The...

Melhoramento do trigo: XVII. comportamento de linhagens de origem mexicana no estado de São Paulo

Twenty three Mexican inbred lines and the cultivars IAC-24 and Anahuac were evaluated in field experiments carried out at Monte Alegre do Sul and Tatuí Experimental Stations and at Maracaí during the period of 1984 to 1986. Grain yield, number of days from emergence to flowering and from emergence to maturation, plant height, percentage of layed plants, head length, number of...

Melhoramento do trigo: XXII. Comportamento de linhagens originárias de trigos de inverno e de primavera no Estado de São Paulo

Twenty four inbred lines and the cultivars Alondra-S-46 were compared in trials carried out at different locations of the State of São Paulo, Brazil, on upland and with sprinkler irrigation, taking into account grain yield, yield components and disease resistance. The response of the genotypes for two race mixtures of stem rust and for three race mixtures of leaf rust was studied...

Possibilidade de seleção recorrente para aumento do teor de óleo em soja com a utilização da macho-esterilidade genética e da espectroscopia de ressonância nuclear magnética

The seed oil content of male sterile plants and their progenies was analised by a NMR spectroscope to study the possibility of recurrent selection to improve the oil content. The seeds derived from a composite named "IAC-1" with genetic male sterility and large variability with respect to oil content. The repeatability coefficient (r) for oil content of each seed of the male...

Triticale: avaliação de linhagens em diferentes regiões paulistas

Twenty four triticale inbred lines and the wheat cultivar IAC-21 were evaluated in field experiments carried out at different locations of the State of São Paulo, Brazil, during the years of 1986 and 1987. Grain yield, plant height, number of days from emergence to flowering, percentage of layed plants, weight of 100 grains, resistance to leaf rust (Puccinia graminis sp. tritici...

Densidade global de solos medida com anel volumétrico e por cachimbagem de terra fina seca ao ar

In soil testing laboratories, soil samples for chemical analysis are usually measured by volume, using appropriate measuring spoons. It is tacitly assumed that such measurements would reflect amounts of soil existing in the same volume under field conditions. This hypothesis was tested, using 12 soil samples of the A and B horizons of six soil profiles. Bulk density in the field...

Anacraga citrinopsis Dyar (Lepidoptera: Dalceridae) em mamoneira no estado de São Paulo

Larvae of A. citrinopsis Dyar were found feeding on leaves of castor-bean plants (Ricinus communis L.) on plantations at Caiuá, Tupi Paulista, Junqueirópolis, Ouro Verde, Marabá Paulista and Cândido Rodrigues, in the State of São Paulo, Brazil. The larvae feed on the lower surface of leaves, were they form cocoon and pupate later on. Only at Junqueirópolis the infestation was...

Herança da pigmentação com antocianina em Crotalaria juncea L.

In order to obtain information about gene markers, crosses were made between contrasting lines in relation to the pigmentation of hipocotyl, base of the flower wing and seed coat. Paternal, F1, F2 generations and backcross to recessive female parent were cultivated in the greenhouse. The inheritance was monogenic. The presence of anthocyanin pigment was dominant in relation to...

Concentrações de 6-benzilaminopurina no desenvolvimento in vitro de embriões de pêssegos e nectarinas precoces

Embryos of early peach and nectarine were cultured on Murashige and Skoog medium containing 3%sacarose,0.6%agar and(in mg/liter) 1 thiamin, 0.5 nicotinic acid, 100 inositol, 250 glycin, 500 glutamin, 250 asparagin, 0.1 giberelic acid, and BAP at concentrations of 0, 5, 10, 15 and 20µM. The frequency of growth was as high as 100% when BAP was included in the medium. The best...

Organogênese floral do pessegueiro in vitro

Meristems of 'Tropical' peach (Prunus persica L. Batsch) were collected on October 30th, November 30th and December 30th of 1986 and in January 30th and February 28th of 1987. These meristems were thereafter cultured in vitro. Those collected until November 30th, produced vegetative buds and normal peach vitroplants. Different results were obtained with the meristems collected in...

Relação entre diferentes caracteres de plantas jovens de seringueira

This study was undertaken aiming to determine the existence of linear correlations, based on simple regression studies for a better improvement of young rubber tree (Hevea spp.) breeding and selection. The characters studied were: yield of dry rubber per tapping by Hamaker-Morris-Mann test tapping (P), mean gurth (CC), bark thickness (EC), number of latex vessel rings (NA...

Redução de nitrato em plantas jovens de café cultivadas em diferentes níveis de luz e de nitrogênio

The effect of levels of light and nitrogen on the activity of the enzyme nitrate reductase and its relationship with the availability of sugars and nitrate was studied in leaves of coffee plants (Coffea arabica L. cv. Catual). Ten month old plants were grown on pots containing a mixture of soil and compost, and were kept at full or 50% sunlight. Half of the plants of each light...

Erosividade da chuva: sua distribuição e relação com as perdas de solo em Campinas (SP)

The rainfall erosion potential for individual storms was evaluated for Campinas, State of São Paulo, Brazil. The erosion potential of a rainstorm is the product of the rainfall energy and the maximum 30-minute intensity of the storm. Over a 22-year period the average annual erosion index computed was 6,738 MJ.mm/.ha.h.year (values ranged from 3,444 to 13,830). Monthly and...

Omissão de macronutrientes em rami

Ramie plants (Boehmeria nivea Gaud.) were cultivated in rinsed sand, under greenhouse conditions, in pots irrigated with destilled water, complete nutrient solution and nutrient solutions with absence of one macronutrient each time (N, P, K, Ca, Mg and S). After three months, the plants showed typical symptoms of deficiency associated to low content of each nutrient in the leaves...

Identificação de espécies de citros mediante polimorfismo enzimático

The genetic diversity of citrus cultivars was studied by polyacrylamide gel electrophoresis on sweet orange (C. sinensis); tangerines (C. clementine, C. sunki, C. reshni, C. reticulata); Palestine lime (C. Iimettioides); West Indian lime (C. aurantifolia); Rangpur lime (C. limonia), Sour orange (C. aurantium) and Poncirus trifoliata. Citrus leaf extracts were analysed for...