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Search Results: 1 - 10 of 18191 matches for " allium cepa l "
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Desempenho de cultivares de cebola nos sistemas organico e convencional em Minas Gerais
Rodrigues, Gabriel Belfort;Nakada, Pamela G;Silva, Derly JH da;Dantas, Gustavo G;Santos, Ricardo RH;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000200017
Abstract: the performance of sixteen onion cultivars grown in the organic and conventional systems was evaluated in vi?osa, minas gerais state, brazil, from april to december 2003. the following onion cultivars were evaluated: 'texas early grano', 'baia periforme', 'alfa tropical', 'texas yellow grano', 'jubileu', 'crioula do alto vale', 'encino', 'régia', 'tropical valley', 'serrana', 'bella crioula', 'ipa-6', 'bola precoce' and the hybrids 'granex', 'mercedes' and 'baia dura'. two experiments were carried out, one in an area of conventional cultivation and another in an organic area, in a randomized block design with four replicates (20 plants per plot). the following characteristics were evaluated: yield, bulbing, bulb weight, bulb weight loss and soluble solids. four cultivars ('texas early grano', 'régia', 'mercedes' and 'encino') showed highest bulb weight loss, ranging from 5.58% to 6.81% after 30 days of harvest; other cultivars showed bulb weight loss ranging from 1,99% (cv. serrana) to 4,71% (cv. granex). nine cultivars had higher yield in the conventional system (cvs. alfa tropical, serrana, bola precoce, baia dura, baia periforme, bella crioula, tropical valley, jubileu and crioula do alto vale) compared to the organic system. cvs. 'baia dura', 'bola precoce' and 'tropical valley' grown in the conventional system had higher yields and showed potential for industrialization, mainly because of bulb quality, higher bulb average weight and soluble solids content.
Características de qualidade de cebola múltipla durante armazenamento sob condi??o ambiental n?o controlada
Maia, Maria C. C;Pedrosa, Josué F;Torres Filho, José;Negreiros, Maria Z. de;Bezerra Neto, Francisco;
Horticultura Brasileira , 2000, DOI: 10.1590/S0102-05362000000100014
Abstract: bulb quality characteristics from multiplier onion half-sib families were evaluated during postharvest storage under natural ambient conditions. for this purpose, one experiment was conducted under laboratory conditions. the experiment was carried out in a completely randomized design with 14 treatments (families) and three replications. soluble solid and dry matter contents were significantly influenced by storage period. maximum weight loss was 21.7% within five weeks.
Controle da mancha acinzentada da cebola e seu impacto sobre a qualidade de mudas
Wordell Filho, Jo?o Américo;Stadnik, Marciel J;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000400008
Abstract: this work studied the effect of mineral and organic fertilization, fungicides, foliar fertilizers and plant extracts on the severity of onion leaf blight caused by botrytis squamosa and onseedling quality. field experiment was carried out at epagri's experimental station in ituporanga-sc from may to july 2005. in a split-plot design with four replicates the following treatments (factor a) were tested: a) control; b) fungicide ciprodinil (75 g a.i./100 l); c) potassium fosfite (00-30-20, 250 ml./100 l); d) foliar fertilizer (03-00-16, 400 ml/100 l); e) bordeaux mixture (0.3%); f) bordeaux mixture/potassium fosfite; g) extract of the alga ulva fasciata (0.2%, dry weight: volume); h) field horsetail (equisetum arwense) extract (0.26%) and i) urtiga dioica extract (0.47%). seedling beds were established under mineral or organic fertilization (factor b). leaf necrosis area (%) was weekly evaluated and used to calculate the area under disease progress curve (audpc). fertilizer type did not affect the development of leaf blight, but the mineral fertilizer increased both plant height and pseudostem diameter. while plant extracts were not effective, the application of fungicide, potassium fosfite, foliar fertilizer (03-00-16), bordeaux mixture alone or combined with fosfite, significantly reduced leaf blight.
Acúmulo de macronutrientes pela cebola 'Optima' estabelecida por semeadura direta
P?rto, Diego R de Q;Cecílio Filho, Arthur Bernardes;May, André;Barbosa, José Carlos;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000400015
Abstract: the objective of this research was to quantify under field conditions, the accumulation of macronutrients by onion 'optima', in cultures established by direct sowing. the experiment was carried out at rio doce farm between the municipal districts of itobi and s?o josé do rio pardo, s?o paulo state, brazil. samples were taken at the 30, 50, 70, 90, 110, 130 and 150 days after sowing (das), for dry mass determination and accumulation of n, p, k, ca, mg and s. the maximum estimated accumulation of shoot and bulb were of 5.70 g plant-1 (2.394.0 kg ha-1) and 13.17 g plant-1 (5.531.4 kg ha-1), respectively, at 150 das. at the end of the cycle, the average contribution of shoot and bulb were about 30% and 70%, respectively. the nutrients n, p, k and s, were accumulated preferably in the bulb; while ca and mg, in the aerial part. the nutrients in decreasing order of accumulation verified for the onion 'optima' were: k > n > ca > s > mg > p. for a population of 420.000 plants ha-1 and a productivity of 72 t ha-1, and considering the observed values, it was verified that the onion 'optima' hybrid exported by bulb 35.0; 5.3; 68.9; 25.8; 5.6 e 21.9 kg ha-1, respectively, of n, p, k, ca, mg and s.
Produtividade e massa fresca de bulbos de cebola sob densidades de plantio no Vale do S?o Francisco
Resende, Geraldo M de;Costa, Nivaldo Duarte;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000200022
Abstract: with the objective of evaluating the effect of different planting spacings on yield characteristics and bulb weight loss, an experiment was carried out from september 1999 to march 2000, in petrolina, pernambuco state, brazil, in a randomized complete block design, in a 2 x 3 factorial scheme, with four replications. the cultivar texas grano 502 prr was planted at 0.10 and 0.15 m row spacings and at 0.10; 0.15 and 0.30 m plant spacings. for commercial yield, it was verified that the row spacing of 0,10 m showed highest yield (37.8 t ha-1) comparatively to the row spacing of 0,15 m (34.4 t ha-1) with linear reductions with the increase in plant spacing. the fresh mass of bulbs increased linearly as the spacings between rows and between plants increased. larger percentages of small and medium bulbs were obtained with the narrowest spacings. as spacing between plants increased, a larger loss of onion bulb mass was found.
épocas de colheita de umbelas e comprimento da haste floral no rendimento e no potencial fisiológico de sementes de cebola
Reghin, Marie Y.;Dalla Pria, Maristella;Otto, Rosana F.;Vinne, Jhony van der;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000200024
Abstract: the paraná state (brazil) contributes significantly to the brazilian onion production. however, this state imports all needed onion seeds. the effect of umbel's harvest period, and harvesting with or without the seed stalk were evaluated. treatments resulted from the combination of three harvesting periods (with green capsules, at the beginning of capsule opening and with 10% opened capsules), combined with umbels on 15 cm long stalks or without stalks, arranged in a factorial scheme 3x2. the experimental design was a randomized blocks, with four replications. the bulbs of crioula cultivar proceeded from epagri, santa catarina state, and were planted on july/2002, in imbituva, paraná state, under protected cultivation. at flowering, four umbels per plot were marked to future use in the evaluations. the number of total of fertile flowers (capsules) and unfertile flowers were counted on each harvested umbel. seeds were detached from capsules and the number of seeds per capsule obtained, besides the yield per umbel, weight of 100 seeds, germination and vigor of the seeds. harvesting umbels with the seed stalk had no effect on the seed yield and on seed physiological potential. the harvesting period presented significant effect on the amount and quality of the harvested seeds. the best harvesting period was at the beginning of capsule opening or when 10% of capsules were opened, resulting in higher number of seeds/umbel, higher seed yield/umbel and higher seed weight per capsule. the average yield was 2.9 g/umbel besides higher vigor (90.25%) and germinability (85.25%). harvesting at the beginning of capsule opening helps to avoid the lost of seeds by thresh or diseases.
Vernaliza??o em bulbos e efeito no rendimento e potencial fisiológico de sementes de cebola
Reghin, Marie Y.;Otto, Rosana F.;Olinik, Jean Ricardo;Jacoby, Carlos Felipe S.;Oliveira, Rafael P. de;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000200026
Abstract: the paraná state (brazil) significantly contributes to the supply of onions in brazil. however, the seed yield activity is far below that desired, giving rise to a need for research in this area. this experiment was conducted in ponta grossa county to evaluate the effect of vernalization periods on different sized bulbs on seed yield and physiological potential of onion seeds, cv. crioula. the experimental design was of randomized blocks with four replications; the treatments followed a factorial scheme 4x2, with four vernalization periods at 50c (control, 25; 35 and 45 days) and two sizes of bulbs (t1 with 6,9 cm of diameter) and t2 (4,8 cm).the vernalization contributed to an increase of seed yield. the longer the treatment period, the higher the percentage of umbels, number of seed stalks, total number of capsules and capsules with seeds. these components contributed to higher seed yield per umbel, both in number and weight, the periods of 35 and 45 days being the most favorable. however, on the seed yield per plant, the period of 45 days prevailed. the seed physiological potential was not affected by the treatment. germination was higher than 80,0% on the first test counting and higher than 90,0% in the last count, independent of treatment. bigger bulbs (t1) produced greater number of flower stalks and larger amounts of fertilized flowers. these two parameters contributed to a higher seed yield per plant when compared to t2.
Efeitos de doses de nitrogênio e potássio e densidade populacional sobre a classifica??o de bulbos de cebola
May, André;Cecílio Filho, Arthur B;Porto, Diego R Queirós;Vargas, Pablo F;Barbosa, José Carlos;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000300015
Abstract: the effect of nitrogen and potassium fertilizer doses and planting densities were evaluated in bulb classification of two onion cultivars. the treatments were arranged in factorial 2 x 4 x 4 x 4, respectively correspondent by cultivars (optima and superex), nitrogen (0; 50; 150 and 150 kg ha-1 of n), potassium (0; 75; 150 and 225 kg ha-1 of k2o) and planting density (60; 76; 92 and 108 plants m-2). the experimental design was of randomized blocks, with four replications the fertilizers ammonium nitrate and potassium chloride were employed to provide n and k, respectively. the nitrogen and potassium application reduced to near to zero the incidence of non-comercial bulbs in both cultivars. the largest percentage of bulbs measuring 50 to 70 mm was reached with 60 plants m-2 and application of 150 kg ha-1 of n, mainly for cv. superex. cultivar superex presented the largest quantity of double bulbs, with the application of 150 kg ha-1 of n (17% of the total bulbs produced) and plant population of 60 plants m-2 (22% of the total bulbs).
Produtividade de híbridos de cebola em fun??o da popula??o de plantas e da fertiliza??o nitrogenada e potássica
May, André;Cecílio Filho, Arthur Bernardes;Porto, Diego Resende de Queirós;Vargas, Pablo Forlan;Barbosa, José Carlos;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000100011
Abstract: an experiment was carried out in sao jose do rio pardo, the onion producing area in s?o paulo state, brazil,from march 07 to august 08, 2004. the objective of the research was to evaluate the effects of nitrogen and potassium fertilizer rates on yield of two onion cultivars, growing in different plant populations. the experimental design was in blocks with four replications in a 2x4x4x4 factorial cheme: cultivars (optima and superex), nitrogen (0; 50; 100 and 150 kg ha-1 of n), potassium (0; 75; 150 and 225 kg ha-1 of k2o) and plant population (60; 76; 92 and 108 pl m-2). the effects of n and k doses on yield were cultivar dependent. average individual bulb mass increased with decreasing plant population and increasing nitrogen doses application. to reach 90% of the maximum expected crop yield of 71 t ha-1 for 'superex' and 64,8 t ha-1 for 'optima', nitrogen doses of 125 and 105 kg ha-1 should be applied, respectively, without potassium fertilization.
Crescimento da cebola em fun??o de doses de nitrogênio, potássio e da popula??o de plantas em semeadura direta
Cecílio Filho, Arthur Bernardes;May, André;Porto, Diego RQ;Barbosa, José Carlos;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000100010
Abstract: the effects of nitrogen and potassium fertilizer doses were evaluated on the growth of two onion cultivars, grown in different plant populations. the experiment was carried out in s?o josé do rio pardo in an onion production area in s?o paulo state, brazil, from 03/07 to 08/08/04. the experimental design was of blocks with four replications in a 2x4x4x4 factorial cheme: cultivars (hybrids optima and superex), nitrogen (0; 50; 100 and 150 kg ha-1 n), potassium (0; 75; 150 and 225 kg ha-1 k2o) and plant populations (60; 76; 92 and 108 plants m2). there was significant effect on the factors separately. at the end of the cycle, the cv. optima presented larger quantities of dry matter in the aerial parts (apdm) and in the bulbs (bdm). the application of nitrogen promoted significant increments in apdm and bdm. the influence of k on apdm was not as expressive as in relation to that observed for the nitrogen, but similarly to this, it increased the accumulation of bdm. the increase of the population of plants reduced the apdm and consequently the bdm. the equations of accumulation of apdm and of bdm, of both cultivars, obtained as the response to the doses of n and k and population of plants, didn't differ from each other.
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