Avaliação da resistência de clones de cupuaçuzeiro a vassoura-de-bruxa.

Esse trabalho foi realizado com o objetivo de avaliar a resistência de clones de cupuaçuzeiro a doença vassoura-de-bruxa, em condições de campo, considerando a perda de frutos causada pela doença

Divergência genética entre clones de cupuaçuzeiro com base em características dos frutos.

O objetivo avaliar a diversidade genética entre 23 clones de cupuaçuzeiro, discriminando os caracteres mais importantes para a divergência genética em procedimentos multivariados. O trabalho foi realizado na Embrapa Amazônia Ocidental em Manaus, AM, em um ensaio com 23 clones. Avaliou-se 9 características do fruto. Os clones foram agrupados utilizando o método de otimização de Tocher, com base nas estimativas de distância Euclidiana média padronizada, utilizando os procedimentos de análise multivariada. Houve a formação de 11 grupos, com maior concentração no primeiro grupo. Em ordem decrescente a contribuição relativa de cada característica para a diversidade genética entre os clones foram número de sementes/fruto, percentual de casca/fruto, percentual de polpa/fruto e percentual de sementes/fruto, totalizando 84,1% de contribuição para a distribuição total, sendo portanto consideradas as mais importantes

Avaliação de campo da severidade de vassoura-de-bruxa em acessos do banco de germoplasma de cupuaçuzeiro.

O objetivo neste estudo foi avaliar a resistência de acessos de cupuaçuzeiro à vassoura-de-bruxa com o uso de escala diagramática como descritor para quantificação da doença em avaliação de campo

Sistemas agroflorestais em assentamento rural no Estado do Amazonas: uma oportunidade para interação homem-meio ambiente.

O objetivo deste trabalho foi de verificar a percepção e adoção de SAF pelos agricultores das comunidades trabalhadas

Sistemas agroflorestais em assentamento rural no Estado do Amazonas: uma oportunidade para interação homem-meio ambiente.

SOUZA, G. F. de [i.e. SOUSA, G. F. de]

Orbital magnetism in axially deformed sodium clusters: From scissors mode to dia-para magnetic anisotropy

Low-energy orbital magnetic dipole excitations, known as scissors mode (SM), are studied in alkali metal clusters. Subsequent dynamic and static effects are explored. The treatment is based on a self-consistent microscopic approach using the jellium approximation for the ionic background and the Kohn-Sham mean field for the electrons. The microscopic origin of SM and its main features (structure of the mode in light and medium clusters, separation into low- and high-energy plasmons, coupling high-energy M1 scissors and E2 quadrupole plasmons, contributions of shape isomers, etc) are discussed. The scissors M1 strength acquires large values with increasing cluster size. The mode is responsible for the van Vleck paramagnetism of spin-saturated clusters. Quantum shell effects induce a fragile interplay between Langevin diamagnetism and van Vleck paramagnetism and lead to a remarkable dia-para anisotropy in magnetic susceptibility of particular light clusters. Finally, several routes for observing the SM experimentally are discussed.Comment: 21 pages, 7 figure

Yield, nutritional status and soil chemical properties as response to cattle manure, reactive natural rock phosphate and biotite schist in Massai grass.

In animal production, grasses planted in the pasture lands have especial value to improve aggregate value of products. This paper evaluates the effects of applying cattle manure, reactive natural phosphate and biotite schist on soil fertility, yield and nutritional content of Megathyrsus spp. cv. Massai. The experiment was conducted under field conditions, in a dystroferric Red Latosol (Oxisol). The experimental design was randomized blocks with the treatments confounding, with one replicate. The treatments consisted of three rates of natural reactive rock phosphate from Algeria - Djebel-Onk (0, 100 and 200 kg ha-1 of P2O5), three biotite schist rates (0, 150 and 300 kg ha-1 of K2O) and three cattle manure rates (0, 20 and 40 Mg ha-1). The application of reactive natural rock phosphate increased dry matter yield (DMY), however, this effect was not observed for cattle manure and biotite schist. The foliar contents of N, K and Mg (cattle manure), P and B (natural rock phosphate) and K (biotite schist) were significantly influenced by the treatments. The same effect was found forP levels in soil, dry matter of the aerial part, Mg and B content in the dry matter

Production, nutritional status and chemical properties of soils with addition of cattle manure, reactive natural phosphate and biotite schist in Massai cultivar.

The objective of this work was to evaluate the effects of cattle manure, reactive natural phosphate and biotite schist on the soil fertility, yield and nutritional status of Megathyrsus spp. cv. Massai. The experiment was conducted under field conditions, in a dystrophic Red Yellow Latosol (Oxisol). It was used a randomized block experimental design with the following treatments: three natural reactive rock phosphate from Algeria (Djebel-Onk) doses (0, 100 and 200 kg ha-1 of P2O5), three biotite schist doses (0, 150 and 300 kg ha-1 of K2O) and three cattle manure doses (0, 20 and 40 t ha-1). The application of natural phosphate increased dry matter yield, however, application of cattle manure and biotite schist did not influence this variable. Foliar levels of nitrogen, potassium and magnesium (cattle manure), phosphorous and boron (natural rock phosphate) and potassium (biotite schist) were influenced by the applied fertilizer doses. Only the levels of phosphorous in the soil and in the plant and levels of magnesium and boron in the plant show interaction with dry matter yield of Massai cultivar