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Silva R.R.,State University Londrina | Benin G.,Federal Technological University of Parana | de Almeida J.L.,Fundacao Agraria de Pesquisa Agropecuaria | de Batista Fonseca I.C.,State University Londrina | Zucareli C.,State University Londrina
Acta Scientiarum - Agronomy | Year: 2014

Choosing the right sowing dates can maximize the outcomes of the interaction between genotype and environment, thus increasing grain yield and baking quality of wheat (Triticum aestivum L.). The present study aimed at determining the most appropriate sowing dates that maximize grain yield and baking quality of wheat cultivars. Seven wheat cultivars (BRS 179, BRS Guamirim, BRS Guabiju, BRS Umbu, Safira, CD 105 and CD 115) were evaluated at four sowing dates (the 1st and the 15th of June and July) in two harvesting seasons (2007 and 2008). The study was setup in a completely randomized block design with four repetitions. The effects of the year and sowing date when combined explained 93% of the grain yield variance. In 2007, the CD 105 and Safira cultivars had the highest grain yield (GY) for all sowing dates. Only the BRS Guabiju and Safira cultivars possessed high baking quality for all sowing dates assessed. In 2008, the environmental conditions were favorable for superior GY, but the baking quality was inferior. Considering adapted cultivars and sowing dates, it is possible to maximize grain yield and baking quality of wheat. Source

Silva R.R.,State University Londrina | Benin G.,Federal Technological University of Parana | da Silva G.O.,Embrapa Transferencia de Tecnologia | Marchioro V.S.,Cooperativa Central de Pesquisa Agricola da Nossa Terra | And 2 more authors.
Pesquisa Agropecuaria Brasileira | Year: 2011

The objective of this work was to identify the best sowing dates and to evaluate the adaptability and stability of wheat cultivars in two wheat growing regions of the state of Paraná, Brazil. Seven cultivars were evaluated at Guarapuava and nine at Palotina as to grain yield, at four sowing seasons, in 2006, 2007 and 2008. The experimental design was a randomized complete block design, with four and three replicates, for Guarapuava and Palotina, respectively. The methodologies REML/BLUP and genotype main effect and genotype x environment interaction (GGE biplot) were used for adaptability and stability analysis, and the AMMI model was used to identify the best sowing dates. Sowing in July, at Guarapuava, and in April, at Palotina, maximized grain yield. The cultivars Safira, at Guarapuava, and CD 113, at Palotina, are stable, highly adapted and show high grain yield. Source

da Silva F.R.,University of South Santa Catarina | Albuquerque J.A.,Santa Catarina State University | da Costa A.,Federal University of Santa Catarina | Fontoura S.M.V.,Fundacao Agraria de Pesquisa Agropecuaria | And 2 more authors.
Revista Brasileira de Ciencia do Solo | Year: 2016

Changes in soil physical properties due to different management systems occur slowly, and long-term studies are needed to assess soil quality. The objectives of this study were to evaluate the effects of soil management systems and liming methods on the physical properties of a Latossolo Bruno Alumínico típico (Hapludox). A long-term experiment that began in 1978 with conventional and no-tillage systems was assessed. In addition, different liming methods (no lime, incorporated lime, and lime on the soil surface) have been applied since 1987 and were also evaluated in this study. Moreover, an area of native forest was evaluated and considered a reference for the natural condition of the soil. Soil physical properties were evaluated in layers to a depth of 1.00 m. Compared to native forest, the conventional tillage and no-tillage systems had higher soil bulk density, penetration resistance, and microporosity, and lower aggregate stability and macroporosity. Compared to the conventional tillage system, long-term no-tillage improved the structure of the Hapludox, as evidenced by increased microporosity and aggregate stability, especially in the soil surface layer. In no-tillage with lime applications sporadically incorporated, soil physical properties did not differ from no-tillage without lime and with lime applied on the soil surface, indicating that this practice maintains the physical quality of soil under no-tillage. Liming in a conventional tillage system improved soil aggregation and reduces penetration resistance in the soil layers near the soil surface. No-tillage was the main practice related to improvement of soil physical quality, and liming methods did not influence soil physical properties in this soil management system. © 2016, Revista Brasileira de Ciencia do Solo. All rights reserved. Source

Stoetzer A.,Fundacao Agraria de Pesquisa Agropecuaria | Kawakami J.,State University of the Central West | Junior A.L.M.,Embrapa Trigo | Lau D.,Embrapa Trigo | And 2 more authors.
Pesquisa Agropecuaria Brasileira | Year: 2014

The objective of this work was to evaluate the protective effect of different forms of insecticide application on the transmission of yellow dwarf disease in barley cultivars, as well as to determine the production costs and the net profit of these managements. The experiments were carried out during 2011 and 2012 growing seasons, using the following managements at main plots: T1, seed treatment with insecticide (ST) + insecticide on shoots at 15-day interval T2, just ST T3, insecticide applied on shoots, when aphid control level (CL) was reached T4, without insecticide and T5, ST + insecticide on shoots when CL was reached. Different barley cultivars - BRS Cauê, BRS Brau and MN 6021-were arranged in the subplots. Insecticides lambda cyhalothrin (pyrethroid) and thiamethoxam (neonicotinoid) were used. There were differences on yellow dwarf disease index in both seasons for the different treatments, while damage to grain yield was influenced by year and aphid population. Production costs and net profit were different among treatments. Seed treatment with insecticide is sufficient to reduce the transmission of yellow dwarf disease in years with low aphid population pressure, while in years with larger populations, the application of insecticide on shoots is also required. Source

Spader V.,Fundacao Agraria de Pesquisa Agropecuaria | Deschamps C.,Federal University of Parana
Semina:Ciencias Agrarias | Year: 2015

The study aimed to evaluate the performance of soybean cultivars at different sowing dates and plant densities. Two experiments were carried out at FAPA (Fundação Agrária de Pesquisa Agropecuária [Agrarian Foundation for Agricultural and Cattle Research]), located at 25°33' S latitude, 51°29' W longitude and with 1.100 meters of altitude in Guarapuava, PR [Paraná], Brazil, in two agricultural harvests (2010/2011 and 2011/2012). The experimental design was in randomized blocks and split plots, in which the sowing dates (10/20, 11/18 and 12/10) were allocated by plot, the densities (250, 350 and 450 thousand plants ha-1) by subplot and the cultivars (BMX Energia, BMX Apolo, BMX Ativa, FPS Júpiter, V-Top, NS 6631, TMG 7161 and BRS Tordilha) by sub-subplot. The agronomic characteristics, grain yield and yield components were evaluated. Sowing dates and plant densities affected the agronomic characteristics, grain yield and yield components of soybean. The best sowing dates for lodging-tolerant cultivars are 10/20 and 11/18, and the best densities are 350 and 450 thousand plants ha-1, while lodging-susceptible cultivars respond best for sowing dates of 11/18 and 12/10 and densities from 250 to 350 thousand plants ha-1. Source

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