Use of urease inhibitors to reduce ammonia volatilization in Amazonian soils.

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Contribuições para melhoria da eficiência da fixação biológica de nitrogênio no feijoeiro comum no Brasil.

Introdução. Fatores limitantes para a fixação biológica de nitrogênio em feijoeiro comum. Fertilidade do solo; Estresse hídrico; Elevadas temperaturas; Incompatibilidade da inoculação com o tratamento de sementes; População de rizóbio nativa do solo. Recentes avanços da fixação biológica de nitrogênio no feijoeiro comum. Identificação de estirpes de rizóbio mais eficientes e competitivas; Coinoculação de rizóbio e Azospirillum brasilense; Uso de bioinsumos (aditivos) para incrementos da nodulação e do rendimento de grãos; Compatibilidade com a adubação nitrogenada; Desenvolvimento e identificação de cultivares eficientes para FBN; Enriquecimento de sementes com fósforo e molibdênio; Uso de ferramentas moleculares nos estudos da interação entre rizóbio e feijoeiro. Perspectivas de aumento da eficiência da fixação biológica de nitrogênio em feijoeiro comum. Literatura citada

Crescimento de cultivares de bananeira em sistemas de produção convencional e orgânico sob sistemas de irrigação de baixo custo.

RESUMO O crescimento da bananeira é determinante nas variáveis de produção da mesma. Os sistemas de produção convencional e orgânico estão sendo avaliados em assentamentos do semiárido, sob diferentes sistemas de irrigação de baixo custo. O objetivo do trabalho foi avaliar nas plantas sua altura, área foliar total (AF), número de folhas totais e diâmetro do pseudocaule de duas cultivares de bananeira - SH3640 e Grand Naine - em sistemas de produção convencional e orgânico. No primeiro ciclo da cultura o sistema de cultivo convencional proporcionou melhor desempenho que o sistema orgânico para as variáveis biométricas medidas. A cultivar SH3640 apresentou maiores médias das variáveis avaliadas em relação à Grand Naine. O valor médio da área foliar foi maior para o sistema de gotejamento com gotejador regulável

Animal Performance with and without Supplements in Mombaça Guinea Grass Pastures during Dry Season.

The objectives were to: 1) evaluate the potential of the animal performance on Panicum maximum cv. Mombaça (mombaça guinea grass) pasture during dry season, and 2) determine the effects of protein or protein-energy supplementation on liveweight gain of steers grazing guinea grass pasture. A complete randomized block design was employed with three treatments and three replicates. Treatments included non-supplemented animals (NS) and animals supplemented with protein (PS) or protein-energy (PES), provided at 0.15% or 0.6% of body weight for 115 days, during dry period. We used 36 weaned calves from initial bodyweigh (LW) of 192 kg (±5 kg) on nine plots of mombaça guinea grass (1.25 ha each). Each month, animals were weighed and pastures sampled to estimate forage characteristics. The average daily gain (ADG) was greater (P = 0.0001) for cattle fed supplement than for cattle fed no supplement (250 g steer-1), and greater for protein-energy supplement (770 g steer-1) than for protein supplement (460 g steer-1). Mombaça guinea grass pastures with 45 cm height at the end of the wetseason have enough forage mass for maintenance throughout the dry season about 1.4 AU ha-1 (AU = 450 kg BW), and reasonable nutritive value (average of 8,1% of crude protein and 55,3% of in vitro organic matter digestibility) to provide small gains. Considering the nutritive value of Mombaça guinea grass during the dry period, protein and energy supplementation is required for weaned calves to optimize their performance

Stress induced magnetic anisotropy on BaTiO3-CoFe2O4 nanogranular composite thin films

The influence of stress on the magnetic properties of BaTiO3-CoFe2O4 nanocomposites deposited by laser ablation on platinum covered Si(001) substrates, was characterized. The cobalt ferrite phase was under compressive strain in the growth direction that progressively relaxed as its concentration increased. A stress induced perpendicular magnetic anisotropy was observed, that decreased with increasing CoFe2O4 content, due to the relaxation of stress in the films.This work has been financially supported by the Portuguese Foundation for Science and Technology (FCT) and FEDER, through the projects POCI/CTM/60181/2004, FEDER/POCTI/0155/94, and through the Associated Laboratory-IN

V*-algebras, independence algebras and logic

Independence algebras were introduced in the early 1990s by specialists in semigroup theory, as a tool to explain similarities between the transformation monoid on a set and the endomorphism monoid of a vector space. It turned out that these algebras had already been defined and studied in the 1960s, under the name of v*-algebras, by specialists in universal algebra (and statistics). Our goal is to complete this picture by discussing how, during the middle period, independence algebras began to play a very important role in logic