Marcos Aurelio Rodrigues

Effect of Light Reduction on the Incidence of Retinopathy of Prematurity

The effect of ocular protection on the incidence of retinopathy of prematurity was tested in 188 newborns weighing less than 1600 g in a randomised controlled trial. No effect of ambient light reduction on the incidence of retinopathy of prematurity was shown.

Formações de 'Clusters' de Eficiência nos Mercados Futuros Agropecuários Mundiais de Soja

We analyzed the efficiency and the presence of clusters in the soybean complex future contracts (soybean, soybean meal and soybean oil) traded in the following future markets: Argentina (MTB), Brazil (BVMF), China (DCE), India (NCD), Japan (TKT), US (CBT) and South-Africa (SAF). Based on the metrics obtained by Euclidian distances of variance ratios, similar dependencies were found for all markets. The results suggest informational efficiency spread. Therefore, agents shall maintain perceptions over several international markets, given the interdependence found for prices in separate future markets.

ALTERAÇÕES NOS ATRIBUTOS QUÍMICOS DO SOLO PELO USO E MANEJO EM LATOSSOLO NA AMAZÔNIA

The proper soil use and management are essential for a sustainable production, thus the pursuit for systems that minimize damages to the environment and improve soil fertility is continuous. The objective of this study was to evaluate changes in soil fertility by the use and management of an Oxisol (Latossolo Vermelho-amarelo, SiBCS) in the Amazon biome. The soil uses and management systems evaluated were native forest, native pasture, minimum tillage system and conventional tillage system. The chemical atributes of the soil layers 0.00-0.10, 0.10-0.20, 0.20-0.30 and 0.30-0.40 m were evaluated. The soil pH (CaCl2) and the contents of organic matter, available phosphorus and exchangeable potassium, calcium, magnesium and aluminum were evaluated and the saturation by Al, effective cation exchange capacity and soil potential were determined. The highest pH values were found in the native pasture area, and the highest exchangeable aluminum contents were found in the layers 0.00-0.10 and 0.10-0.20 m of the conventional tillage system. The highest phosphorus availability was found in the layer 0.00-0.10 m of the native forest area. The highest potassium availability was found in the minimum tillage system. The lowest calcium and magnesium values were found in the layers 0.00-0.10 and 0.10-0.20 m of the conventional tillage system. The highest soil organic matter content was found in the layer 0.00-0.10 m of the native forest area. The nutrient availability for plants decreases in soils managed using the conventional tillage system. Soil uses and management systems of little soil disturbance are recommended to minimize environmental degradation in the Amazon biome.

What is the best fertilizer for Marandu and Xaraes palisadegrass production in the short term

espanolRESUMEN Existen varios fertilizantes disponibles comercialmente para aumentar el rendimiento de los pastos, generando dudas sobre cual debe ser escogido para la fertilizacion, especialmente con respecto a la eficiencia y los costos de operacion a corto plazo. El objetivo de este trabajo fue investigar el efecto de los fertilizantes simples y compuestos sobre la produccion, la composicion quimica y los parametros economicos en una empalizada de Marandu y Xaraes a corto plazo. Se evaluaron los fertilizantes urea, Super N, 08-28-16, 30-00-20 y 20-10-10 en tres cortes de la pradera. La tasa global de macolla, produccion de materia seca, contenido de proteina cruda, nutrientes digestibles totales y energia digestible de empalizada Marandu aumento con la aplicacion de fertilizantes nitrogenados, mientras que la fibra detergente neutra (NDF), fibra detergente acida y contenido de hemicelulosa disminuyeron. La fertilizacion con Super N resulto en una mayor eficiencia por el aumento de produccion por kilogramo de fertilizante aplicado y por unidad de reales (R

Identificação e análise espacial das aglomerações produtivas do setor de confecções na região Sul

) invertidos por hectarea. En la pradera de Xaraes el numero de tallos aumento y disminuyo el contenido de NDF con la aplicacion de 20-10-10. La fertilizacion en la empalizada de Marandu con Super N fue mas eficiente desde el punto de vista economico y productivo que la fertilizacion con urea. Comparando ambas gramineas, Xaraes fue mas exigente en fosforo y potasio que Marandu. EnglishABSTRACT Several fertilizers with different efficiency and price are commercially available to increase the yield of pastures, generating doubts about which should be chosen for fertilization, especially regarding short term operation returns. Our objective was to investigate the effect of simple and compound fertilizers on the production, chemical composition and economic parameters of Marandu and Xaraes palisade grass in the short term. The fertilizers Urea, Super N, 08-28-16, 30-00-20 and 20-10-10 were evaluated in three cuts of the pasture. The overall rate of tiller occurrence, dry matter production, crude protein content, total digestible nutrients and digestible energy of Marandu palisade grass increased with the supply of nitrogenous fertilizers, while neutral detergent fiber (NDF), acid detergent fiber and hemicellulose content decreased. Fertilization using Super N resulted in higher production of mass per kilogram of fertilizer applied and per unit of real (R

A não efetividade do hedge para o boi gordo.

) invested per hectare. The number of tillers of Xaraes palisade grass increased and NDF content decreased with the application of 20-10-10. Fertilization of Marandu palisade grass with Super N is more efficient from the economic and productive point of view than fertilization with urea. Comparing the grasses, Xaraes is more demanding in phosphorus and potassium than Marandu.