Osmar Abílio de Carvalho

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Brazilian Latosols are characterized by low activity clay, little horizon differentiation, a weak macrostructure and a strong microgranular structure. The development of the latter that was reported as being possibly related to the fine material mineralogy, location in the landscape, parental material and biological activity is still under discussion. The(More)
Sheep production is present on all continents and has been practiced in Brazil since the colonization. In this study, the multitemporal dynamics of sheep production in Brazil is examined using official government data (Brazilian Institute for Geography and Statistics-IBGE) from 1976 to 2010. Maps of flock growth rates and growth acceleration maps by(More)
Typically, digital image processing for burned-areas detection combines the use of a spectral index and the seasonal differencing method. However, the seasonal differencing has many errors when applied to a long-term time series. This article aims to develop and test two methods as an alternative to the traditional seasonal difference. The study area is the(More)
Mineralogy of the Latosols of the Brazilian Central Plateau remains under discussion in the absence of clear relationship with their age according to their geomorphic location. The aim of this study was thus to clarify the origin the kaolinite and gibbsite content variation by studying a regional toposequence and using data from the literature. Chemical(More)