Leones Alves de Almeida

Proposta de classificação dos coeficientes de variação em relação à produtividade e altura da planta de soja

The objective of this work was to define categories for the coefficients of variation obtained in soybean plant height and yield. The experimental data were obtained in intermediary and final (regional) adaptation trials carried out in the States of Parana and Mato Grosso. Different categories were established for each State and maturity group. Taking the mean and the standard deviation of the coefficients of variation obtained from the analyses of variance of the experiments, the coefficients of variation were classified as low, average, high and very high. An additional classification was made using the median and pseudo-sigma as substitutes for mean and standard deviation, respectively. The classification for the coefficients of variation depended on the trait and the location but did not vary greatly for each maturity group. The adopted criteria (mean and standard deviation or median and pseudo-sigma) were similar (regardless of the coefficient of variation distribution), and satisfactory in determining the experimental accuracy. The maximum acceptable limits for coefficient of variation are 16% and 12% for yield and plant height, respectively.

Interação genótipo x ambiente no desempenho produtivo da soja no Paraná

Os objetivos deste trabalho foram conhecer o grau de representatividade dos locais no Estado do Parana, onde sao conduzidos os ensaios de avaliacao final de produtividade de linhagens de soja no periodo 1990/2000 e realizar estudo de adaptabilidade e estabilidade das linhagens no ano agricola 1999/2000. As linhagens testadas pertencem aos grupos de maturacao precoce, semiprecoce e medio. Verificaram-se padroes de similaridade de resposta das linhagens dos tres grupos de maturacao, em alguns locais, em todos ou na maioria dos anos testados. Esses padroes dependeram do grupo de maturacao. Contudo, as avaliacoes em Londrina/Cambe, Campo Mourao, Guarapuava/Mariopolis e Sertaneja foram sempre indicadas. O local Ponta Grossa - 1 foi util na discriminacao de linhagens do grupo precoce, e Ponta Grossa - 2, dos grupos semiprecoce e medio. O estudo de adaptabilidade e estabilidade revelou que as linhagens precoces BR95-7613, BRS 137, OC95-3006 e CD96-518 tiveram bom desempenho produtivo, adaptabilidade geral e previsibilidade. A linhagem semiprecoce BR96-25619 mostrou a maior produtividade, tanto em ambientes favoraveis como nos desfavoraveis, e pode ser indicada como tendo adaptabilidade geral. Outras linhagens semiprecoces de bom desempenho, como BR96-18710 e BRS 154, sao indicadas para ambientes favoraveis e geral (ambientes favoraveis e desfavoraveis), respectivamente. As linhagens OC95-3194, BR96-12086 e BR96-16185, do grupo de maturacao medio, destacam-se nos ambientes favoraveis e desfavoraveis.

BRS Celeste: nova cultivar de soja para o sistema de produção de grãos no cerrado

Maintenance or improvement of technology to soybean cultivation is necessary to reach economical productivity in the Brazilian Savannah, where it has shown to be superior to that obtained in the South of Brazil. New cultivars are among the contributions of research to high crop performance and yield stability. The soybean cv. BRS Celeste is an alternative to suit growers demand. It belongs to the same maturity group of cv. BR/EMGOPA 314 (Garca Branca), although it has higher yielding and shows resistance to the main diseases, especially stem canker (Diaporthe phaseolorum f. sp. meridionalis).

Seleção de genótipos de soja resistentes a duas estirpes de Soybean mosaic virus

Soybean mosaic virus (SMV) is the most prevalent virus on soybeans (Glycine max) throughout the world. It causes mottling on seeds and has been associated with yield reduction. Recently, a new strain (SMV 95-1) was found infecting resistant cultivars, causing dwarfing and systemic necrosis. In a screening test carried out with the strains SMV 95-1 and SMV 95-2 on the germplasm collection, several resistant cvs. Embrapa 60, Embrapa 61, Embrapa 62, Embrapa 66 , Embrapa 133, Embrapa 134, Embrapa 135, and Embrapa 136 were identified as resistant to both strains. The resistant genotypes may serve in future soybean breeding programs in Brazil.

BRS Celeste - new soybean cultivar to the grain production system of the Brazilian savannah

Maintenance or improvement of technology to soybean cultivation is necessary to reach economical productivity in the Brazilian Savannah, where it has shown to be superior to that obtained in the South of Brazil. New cultivars are among the contributions of research to high crop performance and yield stability. The soybean cv. BRS Celeste is an alternative to suit growers demand. It belongs to the same maturity group of cv. BR/EMGOPA 314 (Garca Branca), although it has higher yielding and shows resistance to the main diseases, especially stem canker (Diaporthe phaseolorum f. sp. meridionalis).

BRS Celeste-a new soyabean cultivar for the grain production system of the cerrado.

Maintenance or improvement of technology to soybean cultivation is necessary to reach economical productivity in the Brazilian Savannah, where it has shown to be superior to that obtained in the South of Brazil. New cultivars are among the contributions of research to high crop performance and yield stability. The soybean cv. BRS Celeste is an alternative to suit growers demand. It belongs to the same maturity group of cv. BR/EMGOPA 314 (Garca Branca), although it has higher yielding and shows resistance to the main diseases, especially stem canker (Diaporthe phaseolorum f. sp. meridionalis).