Results 11 to 20 of about 133 (103)

The Organic Matter of Chernozem

open access: yesБюллетень Почвенного института им. В.В. Докучаева, 2017
Theories and points of view of soil science classics, such as V. V. Dokuchaev, I. V. Turin and M. M. Kononva on chernozem organic matter are reviewed in this work.
B. M. Kogut
doaj   +2 more sources

Eficiência do politungstato de sódio no fracionamento densimétrico da matéria orgânica do solo Efficiency of sodium polytungstate in density fractionation of soil organic matter

open access: yesRevista Brasileira de Ciência do Solo, 2007
Soluções de iodeto de sódio (NaI) e de politungstato de sódio (PTS) têm sido utilizadas, de forma indistinta, no fracionamento densimétrico da matéria orgânica (MO) do solo. O objetivo deste estudo foi avaliar o efeito desses dois produtos em soluções de
Paulo Cesar Conceição   +5 more
doaj   +2 more sources

Estoques de carbono e nitrogênio e frações orgânicas de Latossolo submetido a diferentes sistemas de uso e manejo Carbon and nitrogen storage and organic fractions in Latosol submitted to different use and management systems

open access: yesRevista Brasileira de Ciência do Solo, 2007
O avanço das fronteiras agrícolas, caracterizado pela substituição de ecossistemas naturais por áreas cultivadas, vem se intensificando nas últimas décadas, acarretando alterações na qualidade do solo e na dinâmica da matéria orgânica do solo (MOS ...
Otacílio José Passos Rangel   +1 more
doaj   +2 more sources

Efeito da solução de separação densimétrica na quantidade e qualidade da matéria orgânica leve e na quantificação do carbono orgânico da fração pesada The effect of density fractionation solutions on the amount and quality of light-fraction organic matter and the content of heavy-fraction organic carbon [PDF]

open access: yesRevista Brasileira de Ciência do Solo, 2008
A matéria orgânica leve tem se mostrado um indicador precoce das mudanças na matéria orgânica do solo (MOS) acarretadas por diferentes usos e sistemas de manejo.
Michelle Sales Moreira Demolinari   +4 more
doaj   +2 more sources

Fracionamento químico e físico da matéria orgânica de um argissolo vermelho sob diferentes sistemas de uso Physical and chemical fractionation of organic matter of an alfisol under different use systems

open access: yesCiência Rural, 2013
Objetivou-se com este estudo avaliar o carbono orgânico total e as frações físicas e químicas da matéria orgânica (MO) do solo em um Argissolo Vermelho Eutrófico arênico, submetido a diferentes sistemas de uso. Os sistemas de uso do solo avaliados foram:
Daiane Carvalho dos Santos   +5 more
doaj   +1 more source

Determinação dos estoques de carbono e nitrogênio nas frações físicas da matéria orgânica em solos antrópicos (Terra Preta de Índio) e não antrópicos da Amazônia Central. [PDF]

open access: yes, 2022
The soil organic matter, as the Amazonian Dark Earths, have functional compartments with different characteristics concerning composition and dynamics and these fractions can be evaluated using physical fractionation, in which the fractions are separated
MADDOCK, J. E. L.   +4 more
core   +1 more source

A review of the tectonic, volcanological and hazard history of Vulcano (Aeolian Islands, Italy)

open access: yesTerra Nova, Volume 35, Issue 6, Page 471-487, December 2023., 2023
Abstract Vulcano is one of the seven volcanic islands composing the Aeolian Islands archipelago (Southern Italy), which also includes three other active volcanoes. The island was originally a stratovolcano like Stromboli; afterwards, its shape turned towards a complex structure composed of several volcanic landforms of different sizes.
Gianfilippo De Astis   +2 more
wiley   +1 more source

Using a refracto-densimetric method for control of secon­dary oil-refining processes: Hydrotreating and hydrocracking

open access: yesУчёные записки Казанского университета: Серия Естественные науки, 2019
The possibility of using flow refractometers and densimeters or refracto-densimetric analyzers to study the quality of diesel fuels obtained in the processes of hydrotreating and hydrocracking of raw materials was discussed.
V.F. Nikolaev   +5 more
doaj   +1 more source

The response of high density turbidity currents and their deposits to an abrupt channel termination at a slope break: Implications for channel–lobe transition zones

open access: yesSedimentology, Volume 70, Issue 4, Page 1164-1194, June 2023., 2023
ABSTRACT The transition between the slope and basin floor is typically marked by a slope break, in some cases causing channels to terminate and turbidity currents to undergo a loss of confinement. It is thus essential to understand how these slope breaks and losses of confinement influence the hydrodynamic evolution of turbidity currents and impact ...
Jonathan Wilkin   +6 more
wiley   +1 more source

The Yih Instability in Layered Lava Flow May Initiate the Pāhoehoe to ‘a‘ā Lava Transition

open access: yesGeophysical Research Letters, Volume 50, Issue 10, 28 May 2023., 2023
Abstract Most basaltic lavas begin flowing as pāhoehoe but sometimes transition into ‘a‘ā. Field observations and previous models have demonstrated that the rheology of smooth, liquid‐like pāhoehoe is distinct from rough, pasty ‘a‘ā, but the cause of this dramatic and rapidly occurring change in rheology has remained unclear.
Cansu Culha, Sam Spinner, Jenny Suckale
wiley   +1 more source

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