Efecto de la intensidad lumínica y precipitación sobre el crecimiento del pasto Brachiaria brizantha cv Toledo en piedemonte llanero

Bogotá (Colombia): Universidad de La Salle. Facultad de Ciencias Agropecuarias. Programa de Zootecnia

Efeito de glifosate sobre a nodulação da soja cv. BRS-Valiosa RR.

2009

Application of survival analysis to determine the persimmon cv. 'Rama-forte' sensory shelf-life.

2014

Avaliação do ciclo de diferentes cv. de amoreira-preta.

2015

EVALUATION AND MONITORING OF ASH (FRAXINUS SPP.) TOLERANT TO LONG-TERM EMERALD ASH BORER (AGRILUS PLANIPENNIS [COLEOPTERA: BUPRESTIDAE]) EXPOSURE

Invasive insects that successfully establish in introduced areas can significantly alter natural communities. These pests require specific establishment criteria (e.g. host suitability) that, when known, can help quantify potential damage to infested areas. Emerald ash borer (Agrilus planipennis [Coleoptera: Buprestidae]) is an invasive phloem-feeding pest which is responsible for the death of millions of ash trees (Fraxinus spp. L.). Over 200 surviving ash trees were previously identified in the Huron-Clinton Metroparks located in southeast Michigan. Trees were assessed over a four year period and a hierarchical cluster analysis was performed on dieback, vigor, and presence of signs and symptoms, in order to place trees into one of three tolerance groups. The clustering of trees with different responses to emerald ash borer attack suggests that there are different tolerance levels in North American ash trees in southeastern Michigan, and these groups were designated as apparently tolerant, not tolerant and intermediate tolerance. Adult landing rates and evidence of adult emergence were significantly lower in the apparently tolerant group compared with the not tolerant group, but larval survival from eggs placed on trees did not differ between tolerance groups. Therefore, it appears that apparently tolerant trees survive because they are less attractive to adult beetles which results in fewer eggs being laid on them. Trees in the apparently tolerant group remained of higher vigor over the four years of the study. North American ash may survive the emerald ash borer epidemic due to natural variation and inherent resistance regardless of the lack of co-evolutionary history with emerald ash borer.

Environmental factors correlated with the metabolite profile of Vitis vinifera cv. Pinot Noir berry skins along a European latitudinal gradient

Mature berries of Pinot Noir grapevines were sampled across a latitudinal gradient in Europe, from southern Spain to central Germany. Our aim was to study the influence of latitude-dependent environmental factors on the metabolite composition (mainly phenolic compounds) of berry skins. Solar radiation variables were positively correlated with flavonols and flavanonols and, to a lesser extent, with stilbenes and cinnamic acids. The daily means of global and erythematic UV solar radiation over long periods (bud break-veraison, bud break-harvest, and veraison-harvest), and the doses and daily means in shorter development periods (5–10 days before veraison and harvest) were the variables best correlated with the phenolic profile. The ratio between trihydroxylated and monohydroxylated flavonols, which was positively correlated with antioxidant capacity, was the berry skin variable best correlated with those radiation variables. Total flavanols and total anthocyanins did not show any correlation with radiation variables. Air temperature, degree days, rainfall, and aridity indices showed fewer correlations with metabolite contents than radiation. Moreover, the latter correlations were restricted to the period veraison-harvest, where radiation, temperature, and water availability variables were correlated, making it difficult to separate the possible individual effects of each type of variable. The data show that managing environmental factors, in particular global and UV radiation, through cultural practices during specific development periods, can be useful to promote the synthesis of valuable nutraceuticals and metabolites that influence wine quality.

Evaluation of water use, yield and water productivity of a high-density orchard (cv. Cobrançosa) subjected to different irrigation regimes – An account of four years

The impact of different irrigation scheduling regimes on the water use, yield and water productivity from a high-density olive grove cv. Cobrançosa in southern Portugal was assessed during the irrigation seasons of 2011, 2012, 2013 and 2014. The experiments were conducted in a commercial olive orchard at the Herdade Álamo de Cima, near Évora (38o 29' 49.44'' N, 7o 45' 8.83'' W; alt. 75 m) in southern Alentejo, Portugal. The orchard was established with 10-year old Cobrançosa trees in grids of 8.0 x 4.2 m (300 trees ha-1) in the E-W direction, and experiments conducted on a shallow sandy loam Regosoil Haplic soil. From mid-May to the end of September the orchard was irrigated and three plots were subjected to one of two irrigation treatments: a control treatment A, irrigated to replace 100% ETc, a moderate deficit irrigation treatment B irrigated to 70% of ETc, and a more severe deficit irrigation treatment C that provided for approximately 50% of ETc. Daily tree transpiration rates were obtained by continuously monitoring of sap flow in representative trees per treatment. Among the irrigated treatments, water use efficiency (WUE, ratio of water used to irrigation- water applied) of treatment C was the highest, with a value of 0.89, being treatment B slightly lower, with a WUE of 0.76. Olive harvest for 2012 was an exceptional “on year”. Bearing yields showed contrasting differences within years where an “on year” was followed by an “off year”. In 2011 and 2012 treatment B yields were 41 and 50% higher than treatment C, respectively. In 2013 treatment B yield was 45% higher than yield of the fully irrigated treatment A, and treatment C showed practically the same yield than treatment A. In the “on year” of 2014 treatment B averaged 48% higher yield than treatment C. Treatment B farm irrigation water productivity (WPI-Farm, ratio of yield to water applied) was the highest among all treatments. Treatment A showed the lowest conversion efficiency of all treatments, indicating treatment B as the adequate deficit irrigation treatment for our Cobrançosa orchard

Impacts of crop level, soil and irrigation management in grape berries of cv ‘Trincadeira’ (Vitis vinifera L.)

Berry size and crop yield are widely recognized as important factors that contribute to wine quality. The final berry size indirectly affects the phenolic concentration of the wine due to skin surface-to-berry volume ratio. The effects of different irrigation levels, soil management and plant crop level on growth of ‘Trincadeira’ berries were studied. In order to test the influence of different irrigation levels (rainfed, pre-veraison and post-veraison), different soil management (tillage and natural cover crops) and different plant crop levels (8 and 16 clusters per vine), leaf water potential, skin anthocyanin, polyphenols, berry skin and seed fresh weight were measured in fruits. The segregation of berries into three different berry classes: small, medium and large, allowed to identify different levels of contribution of soil management and irrigation level into berry, skin and seeds ratios. As expected, higher water availability due to irrigation and soil tillage management during berry development induced an increase in berry flesh weight and this was more evident in larger berries; however, berry skin and seed fresh weight remained unchanged. Also, anthocyanins did not show significant differences.

Parametrage du modèle de culture STICS pour simuler la croissance des prairies de Brachiaria brizantha cv. BRS Piatã en conditions du Cerrado brésilien.

2015

Stylosanthes guianensis cv. BRS Bela managed as organic fodder bank for supplementation of lactation crossbred cows in the Cerrado.

2016

Organic management of Brachiaria brizantha cv. Marandu pasture mixed with Stylosanthes spp. in the Cerrado.

2016

Efeito do 1-MCP no perfil de transcritos diferencias de genes da parede celular, e fotossíntese em maçã cv. Gala armazenada em atmosfera controlada.

Maçãs cv. Gala são conhecidas por apresentarem bom potencial de armazenamento em atmosfera controlada (AC) associada a refrigeração. Condições de 1% de O2; 2% de CO2; 0°C ± 0,5; 90% UR ± 5% são relatadas por preservarem a firmeza de polpa por até nove meses. Entretanto, logo após a saída da AC, uma perda da firmeza é observada, resultando em perdas na qualidade dos frutos durante o transporte e comercialização. Desse modo, o 1-metilciclopropeno (1-MCP) é utilizado com sucesso em conjunto com a AC, por ser capaz de manter a firmeza de polpa de maçãs mesmo após a saída do armazenamento. O objetivo do trabalho foi elucidar mecanismos pelo qual o 1-MCP preserva a firmeza de polpa da maçã armazenada em AC.

Aplicação de fitorreguladores químicos na qualidade tecnológica do sorgo sacarino cv. Biomatrix 535.

Este trabalho buscou avaliar a aplicação dos fitorreguladores químicos na qualidade tecnológica do sorgo sacarino. O ensaio foi realizado na Usina Cerradinho, localizada em Catanduva-SP. O delineamento experimental utilizado foi em blocos casualizados, no esquema de parcelas subdivididas, em que os tratamentos foram constituídos pela combinação de dez tratamentos envolvendo as aplicações dos fitorreguladores químicos: 5; 10; 20 g ha-1 sulfome-turon-methyl; 0,10; 0,20; 0,40 L ha -1 glifosate; 0,2; 0,4; 0,8 L ha-1 ethyl-trinexapac e testemunha. Nos subtratamentos, foram realizadas as amostragens para as avaliações da qualidade tecnológica em épocas distintas após aplicação dos maturadores químicos. A área foi dividida em quatro repetições, cada parcela foi formada de cinco linhas espaçadas de 0,75 m entre si, por 10 m de comprimento, constituída pela cultivar de sorgo sacarino Biomatrix 535. Foram avaliadas qualidades tecnológicas como: pureza (% caldo); açúcares redutores; açúcares redutores totais; brix (% caldo); pol (% caldo); açúcares teóricos recuperáveis; e fibra (%). Os fitorreguladores químicos glifosate na dose de 0,40 L ha-1 e ethyl-trinexapac nas dosagens de 0,20; 0,40 e 0,80 L ha-1 promoveram maior incremento na qualidade tecnológica do sorgo sacarino. As épocas de colheita não influenciaram nas características tecnológicas do sorgo sacarino.

Crescimento vegetativo e produtivo de pessegueiros cv. Chiripá sob efeito de diferentes porta-enxertos.

O Rio Grande do Sul é o principal produtor de pêssegos do Brasil, sendo a região da Serra Gaúcha responsável por cerca de 46% da produção nacional de pêssego de mesa. Diferente do que se observa para outras frutíferas, existem poucos porta-enxertos recomendados para a cultura na região dificultando o aproveitamento de vantagens, como maior produtividade, precocidade, arquitetura da planta e qualidade do fruto. A falta de estudos com porta-enxertos e o desconhecimento da interação com a cultivar-copa faz com que persista o uso de mistura varietal de caroços disponíveis nas indústrias processadoras, gerando desuniformidade nos pomares. Com o objetivo de ampliar o conhecimento sobre o efeito do porta-enxerto na cultivar Chiripá, foi instalado um experimento visando avaliar o crescimento vegetativo e produtivo da cultivar sob o efeito de 19 porta-enxertos, tendo como testemunha a própria autoenraizada, sendo realizado em área de produção comercial no município de Pinto Bandeira, RS, em setembro de 2014, com espaçamento de 3,0 metros entre plantas e 4,0 metros entre linhas no delineamento experimental de blocos ao acaso com quatro repetições.

Atividade antfúngica de óleos essenciais em sementes de feijão cv carioquinha.

2008