Variabilidade dos atributos de um latossolo vermelho sob plantio direto no cerrado brasileiro e produtividade da soja

The spatial variability of several soil attributes (bulk density, penetration resistance, water content, organic matter content and pH) as well as soybean yield have been assessed during the 2007/08 growing season, in Selviria (MS) in a Hapludox (Typic Acrustox), under no tillage. The objectives were to assess the spatial variability of soil and plant parameters at the small plot scale and to select the best soil attribute explaining most the variability of agricultural productivity. Soil and plant were sampled on a grid with 121 points within a plot of 25,600 m 2 in area and slope of 0.025 mm -1 slope. Medium and low coefficients of variation were obtained for most of the studied soil attributes as expected, due to the homogenizing effect of the no-till system on the soil physical environment. From the standpoint of linear regression and spatial pattern of variability, productivity of soybeans could be explained according to the hydrogen potential (pH). Results are discussed taken into account that the soybean crop in no-tillage is widely used in crop-livestock integration on the national scene.

Adsorption and release of micronutrients by humin extracted from peat samples

The objective of this work was to investigate the adsorption of micronutrients in humin and to verify the ability to release these elements in water. The first step was to determine the adsorption capacity of humin for several essential plant micronutrients and check the kinetic parameters. The order of adsorption was Zn < Ni < Co < Mn < Mo < Cu < Fe, whereas Zn showed maximum values of ca. 2.5 mg g-1 and Fe values of ca. 0.5 mg g-1 for systems containing 1 g of humin. Iron presented higher percentages of release (ca. 100%) and Co the lowest percentages (0.14%). The findings suggested that the use of humin enriched with micronutrients can be a promising alternative for the fertilization of agricultural soils, with the additional benefit of incorporating organic matter present in the form of humic substances into the soil and improving the agricultural productivity. © 2013 Sociedade Brasileira de Química.

Formas de fósforo no solo após o cultivo de braquiária e tremoço branco

Phosphorus is one of the major factor that limits agricultural productivity in most tropical soils. The objective of this study was to assess P transformations and availability in a soil cropped to brachiaria (Urochloa ruziziensis) and white lupin (Lupinus albus L.). The study was carried out in a greenhouse at Botucatu, State of São Paulo, Brazil. Brachiaria and white lupin were grown in pots with soil fertilized with 0, 20, 40, 60 and 80mg dm-3 P. The plants were grown for 60 days, when they were harvested and the soil was sampled. Dry matter yields of both species were increased with P rates. Soil bioactive P is increased with P fertilization, but is not affected by the plant species. White lupin is more effective in taking up the organic soil P, but Brachiaria was more effective in reducing the soil maximum P adsorption capacity.

Tolerância à deficiência hídrica em cultivares de cana-de-açúcar avaliada por meio de variáveis morfofisiológicas

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Suscetibilidade magnética, atributos do solo e da planta na discriminação de áreas de manejo específico na cultura do café

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Avaliação de parâmetros fisiológicos em cultivares de cana-de-açúcar submetidas ao déficit hídrico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Resposta varietal da cana-de-açúcar à deficiência hídrica, durante o desenvolvimento inicial em um latossolo vermelho distroférrico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Geoecologia da paisagem na avaliação do uso dos recursos Hídricos da parte inicial da bacia do Ribeirão das Posses - SP

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Variabilidade climática e a produtividade do milho em espaços paulistas

Pós-graduação em Geografia - IGCE

The Outlook for Agriculture and Rural Development in the Americas: A Perspective on Latin America and the Caribbean 2015-2016

In this, the sixth in the series of documents entitled “Outlook for Agriculture and Rural Development in the Americas,” the Economic Commission for Latin America and the Caribbean (ECLAC), the Regional Office for Latin America and the Caribbean of the United Nations Food and Agriculture Organization (FAO), and the Inter-American Institute for Cooperation on Agriculture (IICA) analyze the trends in, and outlook for, the macroeconomic and sectoral contexts, agriculture, rural well-being, and policies and the institutional framework in the sector. The document presents proposals for policies needed to enable the region’s agriculture to regain its former buoyancy and to enhance the development of rural areas. It also includes recommendations designed to mitigate the impact of the economic slowdown in agriculture, spur higher agricultural productivity in the region, foster the integrated management of natural resources, and facilitate the successful incorporation of family farmers, young people, and rural women into agricultural value chains.

Interrelações da produtividade de cana-de-açúcar com atributos químicos de um argissolo vermelho eutrófico paulista

Pós-graduação em Agronomia - FEIS

Produtividade da soja em função de atributos físicos de um latossolo vermelho distroférrico sob plantio direto

Pós-graduação em Agronomia - FEIS

Revista CEPAL no. 118

Número especial por los 40 años de la Revista CEPAL

Productividad agropecuaria: reducción de la brecha productiva entre el Brasil y los Estados Unidos de América

Desde los años setenta, la agricultura del Brasil ha experimentado grandes transformaciones destacándose en la producción agrícola mundial. Para verificar la heterogeneidad estructural en la agricultura brasileña y estadounidense, aquí se estudia la productividad total de los factores (ptf) y se observa su aumento en ambas economías, principalmente mediante tecnologías que permiten ahorrar tierra y trabajo. Aunque en el Brasil se registraron mayores tasas de crecimiento que hicieron posible reducir la brecha productiva en comparación con los Estados Unidos de América, esto no implica que la productividad brasileña sea superior. La estructura productiva presenta particularidades en los dos casos. Las diferencias de productividad no solo se observan entre países, sino también dentro de un mismo país debido a diversos factores: clima, tecnología y aprendizaje en el proceso de producción. La eficiencia en el uso de los recursos, que permite producir más con menos insumos, aumentó en ambos países.

Inter-relações da produtividade de cana-de-açúcar com atributos físico-químicos de um argissolo vermelho eutrófico do noroeste paulista

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)