English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A determinação de C orgânico do solo tem sido realizada, principalmente, por métodos baseados na oxidação química. Contudo, recentemente, o C tem sido determinado por métodos de combustão seca, como o CHNS/O. Este trabalho teve como objetivo comparar três métodos para determinação do C de solos cultivados com eucalipto em regiões com diferentes características edafoclimáticas. Foram comparados os métodos: Walkley-Black, Yeomans & Bremner e combustão seca (CHNS/O), utilizando amostras de diferentes classes de solos obtidas nas seguintes profundidades: 0-20, 20-80 e 80-130 cm nos Cambissolos; 0-25, 25-70 e 70-110 cm nos Latossolos; e 0-18, 18-50 e 50-110 cm nos Neossolos. Amostras de TFSA foram trituradas em almofariz, passadas em peneira de malha de 0,2 mm e submetidas aos três métodos de determinação de C. Os teores de C obtidos correlacionaram-se positiva e significativamente entre si. Os métodos Walkley-Black e Yeomans & Bremner tenderam a subestimar os teores de C em relação ao método de referência, CHNS/O, tanto no que se refere às camadas superficiais quanto àquelas mais profundas, com menores teores de C. Equações de regressão linear com elevados valores de R² permitiram transformar os teores de C obtidos por Walkley-Black e Yeomans & Bremner em C por combustão seca. The soil C content has been determined most frequently by wet combustion methods. More recently, however, the dry combustion method has been used as the reference method for soil C determination. The main purpose of this study was to compare three C determination methods for soils under eucalypt plantations in southeastern Brazil. Samples of different soil types and located under distinct climate conditions were collected. Soil C contents were determined by two wet (Walkley-Black and Yeomans & Bremner) and one dry combustion method (CHNS/O Analyzer) in samples from six soil classes and different horizons: 0-20, 20-80 and 80-130 cm in Inceptsols; 0-25, 25-70 and 70-110 cm in Oxisols; and 0-18, 18-50 and 50-110 cm in Entisols. The soil samples were ground and sieved (0.2 mm) and the C concentration was determined by the three methods. The soil C contents determined by the three methods were positively correlated. However, the C content tended to be underestimated by the Walkley-Black and Yeomans & Bremner methods as compared to the reference dry combustion method, for surface as well as for the deeper soil layers with lower C contents. Linear regression equations with high R² values were adequate to transform C contents determined by the wet combustion methods into C contents equivalent to that determined by the dry combustion method

Comparaçao de métodos de determinação do carbono orgânico em solos cultivados com eucalipto