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Search Results: 1 - 10 of 92706 matches for " José Nildo;Santos "
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Avalia??o de dez linhagens e seus híbridos de milho superdoce em um dialelo completo
Lemos, Margarida Agostinho;Gama, Elto Eugênio G.;Menezes, Dimas;Santos, Venézio Felipe dos;Tabosa, José Nildo;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000200009
Abstract: in 1996/97, 45 single cross supersweet maize hybrids, from a complete diallel cross involving ten inbred lines (s4) and their parents, were evaluated at pesqueira and vitória de santo ant?o, brazil. a látice 7 x 8 design was used with two replications for each location. the general (gca) and specific (sca) combining ability effects and heterosis value were estimated for husked ear weight (hew), unhusked ear weight (uew) and ear rate (er = uew/hew x 100). the general and specific combining ability effects were significant (p<0.01) for all characteristics. inbreds l5 = 76.5%; l7 = 71.2% and l4 = 69.6% (pesqueira); l4 = 70.8%; l5 = 69.4% and l7 = 65.3% (vitória de santo ant?o) showed the highest (er), and the highest gca effects at both locations. the best crosses for er were: l4 x l8 = 74.9% (pesqueira) and l7 x l8 = 70.3% (vitória de santo ant?o), with the highest sca effects at both locations. for er, heterosis values related to parental mean ranged from -20.19 to 24.01% (pesqueira) and -18.02 to 16.76% (vitória de santo ant?o). heterosis values related to the higher yielding parent ranged from -23.52 to 22.99% (pesqueira) and -22.05 to 12.03% (vitória de santo ant?o).
Doses de boro e água residuária na produ??o do girassol
Santos Junior, José Amilton;Gheyi, Hans Raj;Dias, Nildo da Silva;Soares, Frederico Ant?nio Loureiro;Nobre, Reginaldo Gomes;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000400006
Abstract: the availability of water of quality has become worldwide, a major constraint to expanding agricultural frontiers. within this context, this study aimed to evaluate the effects of boron doses and irrigation with two types of water, wastewater and municipal supply water, on yield components of sunflower (helianthus annuus l.) cv. embrapa 122/v-2000. the study was conducted in a greenhouse at the federal university of campina grande, in a randomized block design, analyzed in a 5 x 2 factorial with five b of boron (0; 1.0; 2.0; 3.0 and 4.0 mg l-1) combined with two types of irrigation water (r - wastewater and ab - municipal supply water) with three replications. statistical analysis consisted of analysis of variance (f test) and means were compared by tukey test to compare qualitative factors at 0.05 probability. it was found that the boron levels and types of water did not affect any varieble related to production of seeds, however, irrigation with wastewater variables positively influenced the fresh and dry leaves, stem and shoot all related to forage production.
Comportamento de linhagens de sorgo forrageiro submetidas a déficit hídrico sob condi o controlada
Amaral Sérgio Ribeiro do,Lira Mário de Andrade,Tabosa José Nildo,Santos Mércia Virginia Ferreira dos
Pesquisa Agropecuária Brasileira , 2003,
Abstract: O objetivo deste trabalho foi avaliar os efeitos do estresse hídrico no estabelecimento, desenvolvimento e na taxa de sobrevivência de 11 linhagens de sorgo forrageiro em casa de vegeta o. O delineamento experimental foi o de blocos ao acaso no arranjo de parcelas subdivididas no tempo, com cinco repeti es. As unidades experimentais foram constituídas por recipientes de 250 L, onde foram colocados 187,9 kg de solo da classe textural areia franca. O estudo compreendeu dois períodos de estresse, e três irriga es, sendo uma no início e as outras aplicadas quando grande número de folhas tinham aspecto de palha seca. No primeiro período, as linhagens apresentaram alta taxa de sobrevivência, demonstrando resistência ao estresse hídrico. As linhagens que apresentaram menor velocidade de crescimento nesse período sofreram menos com o estresse. No segundo período n o ocorreram diferen as significativas entre as linhagens com rela o ao desenvolvimento das plantas. Durante os dois períodos de estresse, a velocidade de crescimento n o diferenciou satisfatoriamente linhagens de comportamento distintos, quanto à resistência à seca, competindo em um mesmo recipiente e em alta densidade populacional. As linhagens 84, 29, 99, 41, 63 e 104 apresentaram maior resistência ao estresse hídrico e as linhagens 33, 38, 40, 67 e 92, menor resistência.
Nutritive value of diferents silage sorghum (Sorghum bicolor L. Moench) cultivares
Borba, Luis Felipe Pereira;Ferreira, Marcelo de Andrade;Guim, Adriana;Tabosa, José Nildo;Gomes, Luiz Henrique dos Santos;Santos, Viviany Lúcia Fernandes dos;
Acta Scientiarum. Animal Sciences , 2012, DOI: 10.4025/actascianimsci.v34i2.12853
Abstract: nutrition values of silages from different sorghum cultivars are evaluated. five 26-kg castrated crossbred lambs, housed in pens equipped with feces and urine collectors for the study of their metabolism, were employed in a 5 x 5 latin square experimental design. treatments consisted of silage from five different sorghum cultivars: ipa 1011 and ipa 2564 (grain sorghum), ipa 2502 (dual purpose sorghum), ipa fs-25 and ipa 467 (forage sorghum). protein level was corrected to 12% by adding a mixture of urea: ammonium sulfate (9:1). treatments ipa 1011, ipa 2564 and ipa 2502 provided high intake of dry matter, total carbohydrate and total digestible nutrients, and low intake of neutral detergent fiber. cultivars ipa 1011 and ipa 2564 provided high apparent crude protein digestibility coefficient, whereas cultivars ipa 1011 and ipa 2564 had high total digestible nutrient levels. all cultivars provided positive nitrogen. owing to nutrient intake and digestibility values, grain sorghum silages evidenced high potential in ruminant nutrition.
Identifica??o de fontes de resistência de milho à Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) em campo
Silva, Deise Maria P. da;Oliveira, José V. de;Tabosa, José Nildo;Barros, Reginaldo;Santos, Elton O. dos;Azevedo, Simone S.;
Brazilian Archives of Biology and Technology , 2000, DOI: 10.1590/S1516-89132000000300015
Abstract: the objective of this work was to identify sources of resistance to spodoptera frugiperda (j. e. smith) in six corn cultivars (cms-22, cms-35, ag-106, dina-70, ag-510 and cms-36) which were tested under field conditions using a complete randomized block design with four replications. the following parameters were observed: a) foliar damage, obtained through a visual note scale; b) larvae survival, weigth and length, measured 10 days after artificial plant infestation. there were significant statistical differences (p=0.05) among cultivars only in relation to foliar damage, being ag 510 the most resistant cultivar with an average damage of 5.41. the most susceptible cultivars were cms 35 and ag 106 which had an average damage of 8.38 and 7.85 respectively. significant linear correlations (p=0.01) were found between foliar damage and larvae weigth; foliar damage and larvae length; and larvae weigth and larvae length, indicating the possibility of utilization of these parameters to evaluate resistance of corn cultivars to s. frugiperda.
Identifica??o de fontes de resistência em cultivares de milho à spodoptera frugiperda (J. E. Smith, 1797) em casa-de-vegeta??o
Silva, Deise Maria P. da;Oliveira, José V. de;Tabosa, José Nildo;Barros, Reginaldo;Santos, Elton O. dos;Azevedo, Simone S.;
Brazilian Archives of Biology and Technology , 1999, DOI: 10.1590/S1516-89131999000100014
Abstract: two experiments were conducted in a greenhouse, with the objective of identifying sources of resistance in 15 corn cultivars to spodoptera frugiperda. the following cultivars were utilized cms-35 , cms-36, dina-70, cargill-525, pioneer-3210, pioneer-6875, br-201, br-451, ag-106, ag-510, cms-22, contimax-322, br-201, jatin? c3 an?o, cargill-511 e br-106. when the plants had 8 to 10 leaves they were infested with 30 newly ecloded larvae per plant. damage evaluation was made 10 to 14 days after infestation, in both experiments, using a visual note scale from 0 to 9. there were no statistical differences among cultivars for the parameters evaluated damage, weight, length and survival larvae. nevertheless a significant linear correlation was found between weigth x larvae length (n = 0,7776, p = 0,01), demonstrating that these parameters can be utilized in the study of corn resistence to s. frugiperda.
Adaptabilidade e estabilidade de cultivares de milho no Nordeste brasileiro
Carvalho, Hélio Wilson Lemos de;Cardoso, Mílton José;Leal, Maria de Lourdes da Silva;Santos, Manoel Xavier dos;Tabosa, José Nildo;Souza, Evanildes Menezes de;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000500008
Abstract: forty six maize cultivars were evaluated during two years in 11 different places of brazilian northeast region. trials were carried out during the biennium 2001/2002 using experimental randomized block design, three repetitions, in order to know the adaptability and stability for cultivars recommendation. it was verified that the cultivars showed differentiated behavior among themselves in the mean of environments. the magnitude of the variance for local x cultivars interaction was more expressive than cultivars x years interaction, which suggests that the evaluations have to be done in a larger number of environments. evaluated cultivars differed in adaptability and stability, and are very important for brazilian northeast region.
Emergência em campo de híbridos simples de milho superdoce de um cruzamento dialélico
Lemos, Margarida Agostinho;Gama, Elto Eugênio G.;Menezes, Dimas;Santos, Venézio Felipe dos;Tabosa, José Nildo;Morais, Maria da Salete L.;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000200007
Abstract: to identify single crosses hybrids of supersweet maize of high seed germination in 1996/97, 45 single crosses and 10 inbred lines were evaluated (s4), from a complete diallel cross, at pesqueira and vitória de santo ant?o, brazil. a lattice 7 x 8 design was used with two replications, per each location. the general (gca) and specific (sca) combining ability effects were estimated for the trait stand. in the combined analysis of variance, lines, hybrids and both gca and sca effects were significant (p<0.01). the interactions of gca and sca (p<0.01) were significant with the locations. for the individual analysis, the mean squares estimates for lines, hybrids, gca and sca were also significant (p<0.01). the relative magnitude of gca and sca mean squares indicated predominance of additive gene effects. the average mean seed germination were of 40.4% and 56.5% at pesqueira and vitória de santo ant?o, respectively. the hybrids l3 x l6 and l3 x l7 at pesqueira and l1 x l10 and l3 x l5 at vitória de santo ant?o, were the most favorable single crosses of high quality seed having good field emergence potential.
Coeficiente de repetibilidade e parametros genéticos em capim-elefante
Cavalcante, Marcelo;Lira, Mário de Andrade;Santos, Mércia Virgínia Ferreira dos;Pita, Eduardo Bruno Afonso Ferreira;Ferreira, Rinaldo Luiz Caraciolo;Tabosa, José Nildo;
Pesquisa Agropecuária Brasileira , 2012, DOI: 10.1590/S0100-204X2012000400013
Abstract: the objective of this work was to determine the coefficients of repeatability of morphophysiological traits in elephant grass (pennisetum spp.) genotypes, from data obtained during six evaluation cycles. the minimum number of measurements and genetic parameters were estimated. the experiment design was a randomized complete block, in a split?plot arrangement, with four n levels (control, 30, 60, and 90 kg ha?1 per cut) and 16 pennisetum genotypes (11 interspecific hybrids and five cultivars). the cycles consisted of evaluations in 2010 (4/21, 7/19, and 9/28) and 2011 (1/6, 4/7, and 8/3). the coefficients of repeatability were of medium?high magnitude for all variables, indicating that there was regularity between repeated measures. for the variables forage mass, plant height, leaf length and width, stem diameter, leaf chlorosis and area index, three cycles of evaluation are enough to reach r2 of 90% by principal component analysis. for internode length, the minimal of seven evaluations is necessary to predict the true value of genotypes. the genetic parameters of the variables forage mass, leaf length and width, stem diameter and leaf chlorosis are of high magnitude, favoring the selection of superior pennisetum genotypes.
Adaptabilidade e estabilidade de comportamento de cultivares de milho em treze ambientes nos tabuleiros costeiros do nordeste brasileiro
Carvalho, Hélio Wilson Lemos de;Santos, Manoel Xavier dos;Leal, Maria de Lourdes da Silva;Pacheco, Cleso Antonio Pato;Tabosa, José Nildo;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999001200008
Abstract: the potential of the brazilian northeast coastal tablelands for corn production and the adaptability and stability of sixteen corn cultivars were evaluated at thirteen environments of this region in 1994/95 on a randomized block design experiment with three replications. the large potential of this coastal strip for corn production was evidenced by the obtained yield, highlighting the hybrids, on the coastal tablelands of piauí, sergipe and bahia states, where corn would become a major crop option for the growers. pooled variance analysis showed significant difference for environments and cultivars, and the interactions environment x cultivar, which were inconsistent. hybrids had better adaptation than varieties and populations; they are recommended for higher input situations. the ag 510 hybrid showed good adaptation to low and high input conditions, and therefore is recommended for both situations. the br 5011, br 5028, br 106 and br 5033 varieties had reasonable yields and are suitable for small and medium corn growers.
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