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Search Results: 1 - 10 of 179266 matches for " Dalmo Lopes de; "
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Forma??o de ramos adventícios a partir de espinhos em limoeiro 'Volkameriano' tratados com ácido giberélico
Maia, Emanuel;Siqueira, Dalmo Lopes de;Fernandes, Ant?nio Resende;
Bragantia , 2009, DOI: 10.1590/S0006-87052009000100019
Abstract: gibberellins affect a several of development processes of plants. the formation of axillary buds and their development upon the gibberellic acid (ga) application on plants deficient in its synthesis are known. however the formation of adventitious branches from thorns in citrus still were not reported. thus, the objective of this work was to report for the first time the formation of adventitious branches from thorns of young "volkamericano" lemon plants after treatment with ga3.
Indu??o floral de limeiras ácidas 'Tahiti' submetidas a baixas temperaturas
Santos, Dierlei dos;Siqueira, Dalmo Lopes de;Cecon, Paulo Roberto;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011000300006
Abstract: the research was realized to quantify the need for accumulation hours under low temperatures to the acid lime 'tahiti' flowering, without water application and beyond evaluating gas exchange and chlorophyll a fluorescence under low temperature and light. the experiment was conducted in vi?osa-mg, brazil, with plants from acid lime 'tahiti' grafted on rangpur lime grown in pots of 12 liters. the design was completely randomized with seven treatments and four replicates with one plant per plot. from 02/01/2008 until 04/30/2008, four plants were taken from each growth chamber (cc) (temperatures: 16/12°c (day/night); air humidity: 70%; photoperiod: 10 hours; photosynthetic photon flux density: 100μmol m-2 s-1) to 15 days and taken to a greenhouse (cv) without environmental control, totaling seven dates of transfer. exposure of plants to low temperatures, under controlled conditions, does not cause significant changes in the characteristics of chlorophyll a fluorescence, but caused 80% of reduction in gas exchange. this reduction does not hurt the flowering plants. plants exposed to no-induced conditions only issued vegetative shoots, while those submitted to lower temperatures, the greater was the exposure time, the greater was the number of flowers sent.
Produ??o, florescimento e frutifica??o de tangerineira 'Ponc?' submetida à aplica??o de ácido giberélico
Maia, Emanuel;Siqueira, Dalmo Lopes de;Cecon, Paulo Roberto;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010005000025
Abstract: the florescence and the production of tangerines are influenced by the last production. so, the inhibition of an excessive florescence can avoid a great production and the exhaustion of the plant reserves, contributing to a more uniform production every year. the objective of this work was to evaluate the effect of the reduction of the florescence in ponkan mandarin trees upon the production of fruits in two consecutive productions. the results demonstrated that the gibberellic acid application reduced the flower production and increased the percentage of fruit production in relation to the year with an excessive flowering. the application of the gibberellic acid around 90-150 days before the full flowering period can contribute to the reduction of the effect of the production alternance.
Doses de uréia no crescimento de porta-enxertos de citros produzidos em recipientes
Esposti, Marlon Dutra Degli;Siqueira, Dalmo Lopes de;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000100037
Abstract: the objective of this study was to determinate urea dose to be applied on citrus rootstocks, and evaluation of the rootstock growths in containers. the factorial scheme (2x5) + (2x5) in a experimental design of randomized blocks was used with three replications, to evaluate four rootstocks, and five urea doses varying from 0 to 772 mg dm-3 in substrate. the following characteristics were evaluated: leaves number, leaf area, weight of the leaf fresh and dry matter, stem weight, and roots weights. some differences occurred among the studied rootstock species in relation to the appraised growth characteristics. the rootstocks 'cravo' and 'volkameriano' showed the largest heights and stem diameters, reaching first the grafting point, therefore were considered more vigorous than both mandarin trees in this cropping system. the rootstocks 'cravo' and 'volkameriano' demanded less amount of n than the mandarin trees, since the n doses (mg dm-3 substrate) providing the highest height were 453 to lemon trees ' cravo', 431 to ' volkameriano', 624 to mandarin tree ' cleópatra', and 610 to mandarin tree' sunki'. the largest diameter was reached with doses of 455, 433, 543 and 546 to the lemon trees ' cravo' and ' volkameriano' and the mandarin plants ' cleópatra' and ' sunki'.
Teores de macronutrientes em mudas de aceroleira (Malpighia emarginata DC.) em fun??o da composi??o do substrato
Lima, Rosiane de Lourdes Silva de;Siqueira, Dalmo Lopes de;Weber, Olmar Baller;Cecon, Paulo Roberto;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000600010
Abstract: the composition of substrates with different sources of organic matter is considered as a key factor to obtain seedlings of good quality. then, this study aimed to evaluate the best source and the best quantity of organic matter that should be used in order to produce barbados cherry (malpighia emarginata dc.) seedlings of good quality. a factorial arrangement of four (20:80, 40:60, 60:40 and 80:20% of organic matter:earth) by four (earthworm compost, burnt rice husk, powdered coconut husk and carnauba straw) levels was used and it was designed in randomized blocks with four replicates. the nitrogen, phosphorus, potassium and calcium content of the leaves and stems were quantified in the dry tissue. the results showed that the proportion 80% of earthworm compost:20% of earth allowed good development of the plants and sufficient accumulation of n, p, k and ca. burnt rice husk, powdered coconut husk and carnauba straw have not generated seedlings of good quality.
Comprimento de estacas e parte do ramo na forma??o de mudas de aceroleira
Lima, Rosiane de Lourdes Silva de;Siqueira, Dalmo Lopes de;Weber, Olmar Baller;Cazetta, Jairo Osvaldo;
Revista Brasileira de Fruticultura , 2006, DOI: 10.1590/S0100-29452006000100024
Abstract: the rhizogenic capacitity, sprouting and vigor of cuttings from barbados cherry (malpighia emarginata d.c) were evaluated in greenhouse conditions at the embrapa - national center for research of tropical agroindustry, fortaleza-ce, from november 2000 to january 2001, aiming to identify the best branch part and size for cuttings preparation. the experiment was conducted in a completely randomized design, in a 3x3 factorial scheme, corresponding to three positions on the branch (apical, median and basal) and three length (10, 15 and 20 cm), with three replications composed by 10 cuttings each, and cultured on tubets of 288 cm3, filled wich a misture of organic matter (vermicompost) and carbonized rice husks (3:2 volumetric proportion), and cultivated in a greenhouse with intermittent mist. after 60 days were evaluated the percentage of surviving cuttings, rooted cuttings, roots and aerial part dry matter, number of leaves, not developed meristems, and number of new branches per cutting. results indicated that vegetative propagation by cuttings of barbados cherry is a feasible method, by using cuttings with 10 cm length, taken from the middle positions of the branch, and cultured under greenhouse conditions and intermittent mist.
Rooting of indian berry stem cuttings influenced by the substrate in dibble tubes/ Enraizamento de estacas caulinares de acerola em fun o da composi o do substrato
Rosiane de Lourdes Silva de Lima,Dalmo Lopes de Siqueira,Olmar Baller Weber,Dalva Maria Bueno
Semina : Ciências Agrárias , 2005,
Abstract: The production of nursery is one of the most important steps in fruit crop systems. The rooting of semihardwood cuttings is largely influenced by the substrate composition, container, matrix genotype and physiological stage. The aim of this work was to evaluate the effect of different substratum composition on growth of berry plant genotypes propagated by stem cutting in dibble tubes condition under na intermittent nebulization system in green house, during 60 days. A block factorial design (4x2) comprising four organic sources e two berry genotypes was established. The organic sources of humus (vermicompost), carbonized rice hulls, ripe coir dust and leave dust from carnaúba (Copernicia cerifera) were mixed with na arenic Hapludult (1:1 proportions, v/v) to rooting and growth of P-91 and P-26 berry genotypes in tubules condition. Rooting percentage, dry mass of roots (g), number of leaves (NF) and dry mass of aerial part (g) were measured. The soil and humus mixture was suitable for rooting of semihardwood cuttings and was reflected on the number of leaves and aerial dry mass accumulation. The berry genotype P-26 presented potential for cutting process. A produ o de mudas de espécies frutíferas é uma das mais importantes etapas do sistema produtivo. A forma o de mudas por enraizamento de estacas é influenciada em grande parte pela composi o do substrato, genótipo, recipiente e estádio fisiológica da planta matriz. Este trabalho objetivou avaliar os efeitos de diferentes substratos nas variáveis de crescimento de progênies de aceroleira obtidas por estaquia, em tubetes, sob condi es de nebuliza o intermitente em casa de vegeta o, durante 60 dias. Utilizou-se o delineamento de blocos casualizados em esquema fatorial de 4x2, (quatro fontes de matéria organica e dois genótipos). As fontes organicas de húmus, casca de arroz carbonizada, pó de casca de coco e bagana de carnaubeira foram misturadas ao Argissolo Vermelho-Amarelo distrófico (PVAd) (propor o 1:1) para o enraizamento dos genótipos P-91 e P-26. Foram mensurados a porcentagem de enraizamento, a massa das raízes secas (g), o número de médio de folhas e a parte aérea seca (g) das estacas. A mistura de húmus e solo propiciou condi es adequadas para enraizamento de estacas e o crescimento das mudas, com reflexos no número de folhas e na massa seca da parte aérea. A progênie 26 apresentou potencial para a produ o de mudas por estaquia.
Micropropaga??o das bananeiras 'Prata-An?' e 'FHIA 01' a partir de explantes de plantas tratadas com paclobutrazol
Souza, Djalmary de Souza e;Siqueira, Dalmo Lopes de;Cecon, Paulo Roberto;Santos, Dierlei dos;
Revista Brasileira de Fruticultura , 2010, DOI: 10.1590/S0100-29452010005000059
Abstract: with the objective of evaluating development in vitro of explants of the banana trees 'prata an?' and 'fhia 01' originated from adult plants treated with paclobutrazol (pbz), this experiment was conducted at the laboratory of tissue and cells culture, pomology section, dft/ufv. factorial outline 2 x 5 was used, corresponding to the two cultivars ('prata an?' and 'fhia 01') and five doses of pbz (0.0, 0.5, 1.0, 1.5 and 2.0 g i.a. plant-1), arranged in an entirely random design, with different number of replicates. it was evaluated on the aerial part: the rate of sprouting, height and diameter, number of leaves, fresh and dry mass and intensity of the green color; and root system: percentage of rooting, number of roots, length of the largest root, fresh and dry mass, and mass of the roots:mass of the aerial part relation. the height of the aerial part started to be reduced from the dose of 1.13 g i.a. plant-1 in both cultivars. the diameter was not altered with the increase of the doses, but in the explants of the 'prata an?' it was observed larger diameters compared to 'fhia 01'. the number of leaves, the dry and fresh weight did not suffer alterations among the different doses, nor between cultivars. the intensity of the green color increased linearly with the increase of the dose in both cultivars. starting from the dose 1.07 g i.a. plant-1 the rate of sprouting for 'prata an?' was inhibited, while there was an enhancement of the rate for 'fhia 01' starting at dose of 0.85 g i.a. plant-1. there was significant interaction for the percentage of rooting, with lower values for the cultivar 'prata ana' (64.71%) compared to 'fhia 01' (95.83%) for the higher dose. it was not observed effect of the doses of pbz about the percentage of rooting of the explants of the cultivar 'prata an?', while for 'fhia 01' there was linear increase with the dose elevation, with the largest rooting value of 95.18%. the other characteristics there was linear increase with the increment of p
Crescimento dos frutos de laranjeira 'Salustiana' situados em ramos anelados com diversas rela??es de folhas/frutos
Siqueira, Dalmo Lopes de;Guardiola, José Luiz;Souza, Emanuel Fernando Maia de;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000200008
Abstract: the relationship between the foliar area and the fruit growth is an important theme because affects the tree productivity and fruits quality. in this work was evaluated the effect of the foliar area on the growth of the salustiana's sweet orange fruits. girdled shoots of 12 months were used with a single terminal fruit and several leaves-fruit ratios. it was evaluated, weekly, the fruit growth and the leaves starch contents during 42 days. the fruit growth, evaluated in the stage ii, depended on the available leaf area per fruit, provided that 30 leaves were enough to guarantee its growth. the starch reserves in the leaves depended on the available leaf area per fruit and they reduced with the increase in the diameter and dry and fresh weight of the fruits.
Efeito do estresse salino na absor??o de nutrientes em mangueira
Lucena, Cicero Cartaxo de;Siqueira, Dalmo Lopes de;Martinez, Hermínia Emilia Prieto;Cecon, Paulo Roberto;
Revista Brasileira de Fruticultura , 2012, DOI: 10.1590/S0100-29452012000100039
Abstract: the effect of salt stress on the dry mass, absorption and transport of nutrients was evaluated in mango cultivars 'haden', 'palmer', 'tommy atkins', and 'ubá' grafted on rootstock 'imbu'. plants were grown in modified hoagland solution in aired static hydroponic system containing 0, 15, 30, and 45 mmol l-1 nacl. the dry mass of the roots, the stem of the rootstock and the stem of the scion as the dry mass of the leaves has decreasing at concentrations from 15 mmol l-1 nacl. there was a significant reduction of n, p, k+, ca+2 and mg+2 in the leaves of cultivars 'haden', 'palmer' and 'ubá' respectively. cultivar 'tommy atkins' showed no change in the content of n, p, k+ and ca+2 in the leaves. the levels of n, p, k+, ca+2 and mg+2 decreased with the increase of the nacl in the root system of all cultivars. the external concentration of the ion na+ has occupied the site of absorption of k+ and mg+2 and the ion cl- acted at the absorption site of n and p by inhibiting their absorption due to competitive mechanisms.
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