Study of the interaction genotypes x environments in the selection process of upland rice.

The objectives of this study were the investigation of the interactions between upland rice lines/cultivars x planting system, years and locations. The experiments were conducted in the agricultural years of 2001/02 and 2002/03 in Lavras, Uberlandia and Patrocinio in the state of Minas Gerais (MG), Brazil, in two planting systems: conventional and no-tillage. The treatments were 20 lines/cultivars and the evaluated traits were: plant height, flowering date, grain yield and disease incidence. The absence genotype x system interaction of grain yield indicated that cultivars recommended for sowing traditional can be utilized in the no-tillage system. The interactions genotypes x locations and genotypes x years were significant. The Cruz methodology indicated that cultivar Caiapo presented adaptation in unfavourable environments and the line CNAs 8983 showed response in the environment improvement. The Annicchiarico methodology showed that Guarani and CNAs 8989 were the most stable

Asian soybean rust: modeling the impact on soybean grain yield in the Triângulo Mineiro / Alto Paranaíba Region, Minas Gerais, Brazil.

Understanding the impact of Asian soybean rust on soybean yield is of great importance in the crop simulation model for this crop become it is possible to predict yield using different sowing dates and growth conditions. The goal of this study were to evaluate the performance of two soybean cultivars in Triângulo Mineiro/Alto Paranaíba, MG, Brazil and the effects of soybean rust on the yield of these cultivars using the CSM-CROPGRO Soybean model. Two soybean cultivars NK 7074 (early) and UFUS-Impacta (medium late), which differ in their development cycles, were growing in Uberaba city during the 2009/2010 growing season. The validation for cultivar UFUS-Impacta was conducted comparing the measured and simulated yield data considering three different sowing dates in the Uberlândia city during the 2002/2003 growing season. Daily meteorological data obtained from six meteorological stations of the National Institute of Meteorology (INMET ). To determine the performance of the soybean cultivars and the effect of soybean rust on yield, three different scenarios were used: no occurrence of rust (NOR) and occurrence of rust with inoculum concentrations of U5.000 and U10.000 urediniospores/mL. For all environments studied, the early cultivar had the best performance than the medium late cultivar. Soybean rust had the most effect on yield for the U10.000 scenario than for the U5.000 scenario. The best soybean performance occurred for Araxá and Uberaba cities. The South-Southeast area of the Triângulo Mineiro/Alto Paranaíba region was the most sensitive to the effect of rust on yield compared to the North region

Eficiência de fungicidas para o controle da ferrugem-asiática da soja, Phakopsora pachyrhizi, na safra 2010/11: resultados sumarizados dos ensaios cooperativos.

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A critical-point yield model to appraise the damage caused to soybean by white-mold.

Título em português: Modelo de ponto crítico para estimar os danos causados pelo Mofo-branco em soja. Artigo de acesso aberto

Eficiência de fungicidas para o controle da ferrugem-asiática da soja, Phakopsora pachyrhizi, na safra 2011/12: resultados sumarizados dos ensaios cooperativos.

Material e método: Tabela 1 - Instituições, locais, cultivares, datas da semeadura da soja, presença (1) ou ausência (0) de sintomas de ferrugem na primeira aplicação de fungicida (incidência - INC). Tabela 2 - Ingrediente ativo (i.a.), produto comercial (p.c.) e dose dos fungicidas nos tratamentos para o controle da ferrugem-asiática da soja, safra 2011/12. Resultados e discussões: Figura 1 - Box plot da porcentagem de controle da ferrugem, para os diferentes tratamentos com fungicidas, em relação à média da severidade da testemunha sem controle (T1). Figura 2 - Box plot da porcentagem de redução da produtividade, para os diferentes tratamentos com fungicidas, em relação à média da produtividade do melhor tratamento. Tabela 3: Severidade da ferruge, porcentagem de controle em relação à testemunha sem tratamento, produtividade (Kg ha-1) e porcentagem de redução de produtividade (RP) em relação ao tratamento com a maior produtividade, para os diferentes tratamentos. Média de 11 ensaios para severidade e de 15 ensaios para produtividade. Rede de ensaios cooperativos, safra 2011/12.bitstream/item/61841/1/CT93.2012.pd

Eficiência de fungicidas para o controle da ferrugem asiática da soja, phakopsora pachyrhizi, na safra 2009/10: resultados sumarizados dos ensaios cooperativos.

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