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Oxidizible organic carbon fractions in a latosol cultivated with coffee at different planting spacings. The present work was carried out to evaluate soil carbon susceptibility to oxidation by potassium permanganate in adystroferric Red Latosol Oxisol cultivated with coffee Coffea arabica L. Treatments consisted of a combination of four row spacings 2. As a reference, soil samples were also collected in an area under native forest. For assessing the degree of oxidation of the organic carbon OC , soil samples were collected at the inter-row and in the coffee canopy projection, at the Labile C in inter-row samples located at the soil surface layer
Many translated example sentences containing "radiocarbon dating" - Spanish-English Fechado por Radio Carbono de ir radiocarbono, mientras que el C Lo del SEO Negativo es una broma. Carbon, 14 C , or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. La vida media de 14 C contienen tan solo unos pocos miligramos de carbono. La ciencia no es una vaca sagrada.
The ice age problem was the first and, until a few decades ago, the only relevant debate on climate change, emerging as a discussion in geology, which was unable to frame it. It remained a mystery in the nineteenth century, being discussed in mathematics and astronomy, and it was a matter of speculation in geophysics and geochemistry without a satisfactory solution. The basic explanation for the occurrence of ice ages was given by Milankovitch, by means of his mathematical theory of insolation in the s. Nevertheless, only the consolidation of paleoclimatology, in the s, provided the necessary evidence to prove it. The refinement of these studies in paleoclimatology, however, brought to light an unexpected phenomenon: the transition between equilibrium state in the climate system took place very quickly in the past.