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Search Results: 1 - 10 of 190294 matches for " LANDELL MARCOS GUIMAR?ES DE ANDRADE "
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Análise de vizinhan?a na avalia??o de genótipos de cana-de-a?úcar
Candido, Liliam Silvia;Perecin, Dilermando;Landell, Marcos Guimares de Andrade;Pavan, Bruno Ettore;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009001000014
Abstract: the objective of this work was to study different competition covariates in neighborhood analysis and to check the efficiency of this analysis in the increase of the experimental precision and the consequences in the ranking of sugarcane genotypes in terms of productive potential. data used were from the state experimental network of the sugarcane breeding program installed in 2002, of the instituto agron?mico, campinas, sp, brazil. the experimental design was in randomized complete blocks, with three replicates. the plots were formed of five 8 m rows with 1.5-m spacing between rows. the stalk productivity (tch, mg ha-1) was evaluated in the first and third harvests. the covariates "side", "tip" and "4 neighbors" were included in the papadakis method and in two variations of the moving average method. the papadakis and moving average 1 methods did not change the experimental precision in comparison with traditional analysis. the moving average 2 method reduced the environmental variance. however, it changed the estimates of the genetic variance and the genotype ranking, and could lead to erroneous conclusions in the selection. although the "side" covariate was influential on competition, its effect or on five row-plots was small.
Avalia o final de clones IAC de cana-de-a úcar da série 1982, em latossolo roxo da regi o de Ribeir o Preto
Bragantia , 1999,
Abstract: Doze clones de cana-de-a úcar, provenientes de hibrida es realizadas em 1982, foram avaliados em três experimentos, em latossolo roxo, da regi o de Ribeir o Preto (SP). Para tanto, utilizou-se o delineamento em blocos ao acaso, com seis repeti es, efetuando-se a análise estatística com a média das quatro colheitas (1. o, 2.o, 3.o e 4.o cortes). Avaliaram-se as produtividades de cana e a úcar, pol% cana, fibra% cana, popula o de colmos e intensidade de florescimento. Considerando-se essas características, assim como a curva de matura o dos clones, e tomando-se como padr es as variedades SP70-1143, SP71-1406, IAC64-257 e RB76-5418, o clone IAC82-2045 apresentou um desempenho equivalente, caracterizando-se como material de alta produtividade agrícola, boa riqueza, com a matura o do meio para o final de safra, podendo ser incluído em novos estudos de manejo varietal para outras condi es paulistas. Ainda se destacou, com algumas restri es, indicadas pela intera o ambiente x clone para a produtividade agrícola, o clone IAC82-2120, com boa riqueza e possibilidade de ser colhido a partir de junho. Estimando-se os parametros genéticos, observou-se, mediante a componente da variancia genótipo x ambiente, a significativa resposta dos genótipos a ambientes específicos, mais acentuadamente para os caracteres produtivi-dade agrícola e produtividade média de a úcar, e menos expressiva para teor de sacarose.
Agronomic performance of sugarcane families in response to water stress
Silva, Marcelo de Almeida;Soares, Rogério Augusto Bremm;Landell, Marcos Guimares de Andrade;Campana, Mário Pércio;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000300014
Abstract: water deficit is one of the major factors limiting the production of sugarcane, especially in areas where there is a prolonged period of water deficiency, such as the west central brazilian region. one way to overcome this problem is to cultivate resistant or tolerant varieties. an experiment was set up at the jalles machado sugar mill, located near goianésia, goiás state, brazil, to evaluate agronomic performance of several sugarcane families. a comparative analysis was carried out among the families under two irrigation regimes, one under regular environmental conditions and another under monthly irrigations during the period of water deficiency. evaluated families consisted of 25 progenies planted in a factorial design with three replications with 20 plants each. the first ratoon crop was evaluated for four yield components, stalk height, stalk diameter, stalk number and brix. by analysis of variance, stalk number and stalk height were influenced by water stress conditions during the initial growth phase, and for stalk diameter and brix, water regime had no effect on the average expression of the characters during the growth phase. the method of classification in four categories proved to be adequate. some families had high values for stalk diameter, stalk number and stalk height under water stress conditions. this study showed that it is possible to select sugarcane families under water deficit conditions associated with higher stalk diameter, stalk number and stalk height.
Avalia??o de clones de híbridos IAC de cana-de-a?úcar, série 1985, na regi?o de Jaú (SP)
Bragantia , 1999, DOI: 10.1590/S0006-87051999000200013
Abstract: 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 s?o 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 harvest means. data on number of stalks, stalk weight, yield decline index, fiber % cane and flowering intensity, are also shown. according to these characteristics compared to two varieties used as control, sp70-1143 and sp71-1406, the clone iac85-3229 showed good potential with possibility of inclusion in varietal management studies for other regions of the state of s?o paulo.
Melhoramento da cana-de-a?úcar: X. Ensaio de clones provenientes de hibrida??es realizadas em 1981 e selecionados na regi?o de Jaú (SP)
Campana, Mário Percio;Silva, Marcelo de Almeida;Alvarez, Raphael;Landell, Marcos Guimares de Andrade;Figueiredo, Pery;Bolonhezi, Denizart;
Bragantia , 1995, DOI: 10.1590/S0006-87051995000200008
Abstract: seven sugarcane clones obtained from crosses made in 1981 in camamu, state of bahia, were evaluated in a trial in jaú region. in the trial, started in february, 1988, it was used a randomized complete block design with six replications. statistical analysis for cane and sugar yield (t/ha) and sugar content (pol% cane) were performed with five harvest means. it was presented evaluation data of number of stalks, fibre% cane and flowering intensity. according to these characteristics studied comparatively to five varieties used as control, iac67-112, na56-79, sp70-1143, sp71-1406 and po77-102, the clones iac81-3041 and iac81-3049 showed be promising and in condition to be included in varietal management studies for others regions of the state of s?o paulo, brazil.
Oxisol subsurface chemical attributes related to sugarcane productivity
Landell Marcos Guimares de Andrade,Prado Hélio do,Vasconcelos Ant?nio Carlos Machado de,Perecin Dilermando
Scientia Agricola , 2003,
Abstract: In spite of the great homogeneity found in the morphological characteristics of Oxisols, there is great chemical diversity in subsurface layers of these soils. Studies indicate that crop yield presents significant correlation with the chemical attributes of the subsurface, which, are more stable than attributes found in the plough layer, subject to greater alterations as a consequence of agricultural exploration. This work evaluated the effects of subsurface chemical attributes of Oxisols of the South Central region of Brazil, on the yield of sugarcane clones and of variety RB72454, during the first, second and third cropping cycles. Productivity data were obtained between 1993 and 1998. Soils were characterized in terms of their mechanical analysis and chemical traits at 0.8 to 1.0 m; correlation studies between these attributes and mean daily productivity as well as multiple regression analysis were also carried out; variables were selected based on their R2 values by means of the stepwise procedure. The subsurface chemical traits of the Oxisols influenced sugarcane productivity, especially the 3rd harvest; the clone productivity model for the 3rd harvest as a function of base saturation and phosphorus content presented R2 = 0.31, i.e., 31% of the variation in sugarcane yield (t ha-1 day-1) can be explained by these two attributes. For variety RB72454, 47% of that variation is explained by the sum of bases and contents of calcium and organic matter. Variations on productivity at 1st and 2nd harvests can be better explained by pHwater.
Avalia o de clones de híbridos IAC de cana-de-a úcar, série 1985, na regi o de Jaú (SP)
Bragantia , 1999,
Abstract: Dez clones de cana-de-a úcar, provenientes de hibrida es realizadas em Camamu (BA), em 1985, foram avaliados em um ensaio na regi o de Jaú (SP), instalado em fevereiro de 1991. Utilizou-se o delineamento em blocos ao acaso, com 6 repeti es, estimando-se a produtividade de cana e a úcar e pol % cana, em média, de quatro colheitas, além de dados de popula o de colmos, peso médio de um colmo, índice de queda de produtividade, fibra % cana e intensidade de florescimento. Considerando-se essas características em rela o às variedades SP70-1143 e SP71-1406, utilizadas como padr o, o clone IAC85-3229 revelou-se promissor, em condi es de ser incluído em estudo de manejo varietal em outras regi es paulistas.
Melhoramento genético da cana-de-a?úcar: avalia??o de clones provenientes de hibrida??es efetuadas em 1965
Alvarez, Raphael;Segalla, Antonio Lazzarini;Landell, Marcos Guimares de Andrade;Silvarolla, Maria Bernadete;Godoy Junior, Gentil;
Bragantia , 1987, DOI: 10.1590/S0006-87051987000100012
Abstract: a group of 18 of the best sugarcane clones obtained from hybridation in 1965, at the experimental station of ubatuba, instituto agron?mico, were evaluated in one experiment carried out in santa lydia mill, ribeir?o preto, state of s?o paulo, brazil. in 1973, it was started a field trial using as controls the commercial varieties na56-79, and cb41-76. the experiment design was a randomized complete block with four replications. the cane yield (t/ha), sugar content (kg/t cane), and sugar yield (t/ha) were expressed as the average of three harvests: cane plant (18 months), first ratoon (12 months after) and second ratoon (12 months after). according to these characteristics the clones iac65-55, iac65-257, iac65-113, iac65-155 and iac65-255 were selected, and constitute alternatives of new varieties for the sugarcane cropping in the region of ribeir?o preto.
Melhoramento genético da cana-de-a?úcar: VII.ensaios de clones IAC, série 1977, em latossolo vermelho-escuro, na regi?o de Ribeir?o Preto (SP)
Landell, Marcos Guimares de Andrade;Alvarez, Raphael;Pereira, José Carlos Vila Nova Alves;Silvarolla, Maria Bernadeie;
Bragantia , 1992, DOI: 10.1590/S0006-87051992000100007
Abstract: in order to study 16 sugarcane clones, obtained from hybridizations made in 1977, in camamu, state of bahia, it was carried out an experiment in dark red latosols, at s?o martinho mill, pradópolis, state of s?o paulo, field trial was started in 1986, using a randomized complete block design with four replications. statistical analysis was performed with four harvest means. it was evaluated cane and sugar yield (t/ha), sugar content (pol % cane), fiber % cane, number of stalks and flowering. according to these characteristics, in addition to the level of resistance to smut, studied comparatively to four varieties used as control, sp70-1143, iac64-257, na56-79 and iac58-480, the clones iac77-186, iac77-51 and iac77-192 showed to be new options to be studied for varietal management in similar environmental conditions.
Composi??o química de genótipos de cana-de-a?úcar em duas idades, para fins de nutri??o animal
Andrade, Jo?o Batista de;Ferrari Junior, Evaldo;Possenti, Rosana Aparecida;Otsuk, Ivani Pozar;Zimback, Léo;Landell, Marcos Guimares de Andrade;
Bragantia , 2004, DOI: 10.1590/S0006-87052004000300004
Abstract: at the instituto de zootecnia, nova odessa (sp), brazil, it was carried out an experiment to evaluate 24 cultivars and 36 sugarcane clones as raw material for animal feeding. the experimental design was set in randomized blocks with three replications. the sugarcanes were harvested at 12 and 18 months. genotypes and age of harvest showed differences for %dm (dry matter); %cp (crude protein; %ee (ether extract); %ach (ach); %tnc (total non-structural carbohydrates) , %ndf (neutral detergent fiber); %adf (acid detergent fiber); %cel (cellulose); %hcel (hemicellulose) and %lig (lignin), except for %ee, for harvest ages. significant differences for %tnc, %ndf, %adf, %cel, %hcel and %lig) were observed for two ages of harvest.
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