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9 results

Contribution of Eucalyptus Harvest Residues and Nitrogen Fertilization to Carbon Stabilization in Ultisols of Southern Bahia

Fernanda Cristina Caparelli Oliveira, Ivo Ribeiro Silva, Gabriel William Dias Ferreira, Emanuelle Mercês Barros Soares, Sérgio Ricardo Silva, Eulene Francisco Silva

19/Jan/2018

ABSTRACT: Eucalyptus forests in southern Bahia (BA) are planted in soils with a sandy surface layer and humid tropical climate, conditions that lead to soil carbon (C) decomposition. Recent studies have shown that nitrogen (N) may be important for soil C stabilization. The aim of this study was to evaluate the contribution of Eucalyptus harvest residues and nitrogen fertilization to C stabilization in Ultisols of southern BA. The experiment was conducted in Eucalyptus clonal plantations cultivated in two regions of […]

Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols

Gustavo Souza Valladares, Marcos Gervasio Pereira, Vinícius de Melo Benites, Lúcia Helena Cunha dos Anjos, Adierson Gilvani Ebeling, Roni Fernandes Guareschi

17/Oct/2016

ABSTRACT Despite limited geographic expression of Organosols in Brazil, their high carbon storage capacity and natural environmental vulnerability justifies further studies on C and N stocks in these soils and their relationship to the nature of organic matter. Evaluation of physical and chemical properties of organic soils and their ability to store C is important so as to develop sustainable management practices for their preservation. The objectives of the study were to measure the total organic carbon stock (OCst), total […]

Successive Cultivation of Soybean/Corn Intercropped with Urochloa brizantha topdressed with Nitrogen

Danilo Gomes Fortes, Edgard Jardim Rosa, Yara Brito Chaim Jardim Rosa, Fábio Régis de Souza, Evandro Gelain

23/Aug/2016

ABSTRACT Corn intercropped with Urochloa brizantha (Syn, Brachiaria brizantha) has been indicated as a suitable alternative management practice for rational land use in crop-livestock production systems in the Cerrado region of Brazil. An experiment was carried out in Maracaju, MS, Brazil to evaluate the effect of sequences of soybean/second-crop corn systems intercropped with Urochloa brizantha and the effects of forms of nitrogen on soil chemical and physical properties. A randomized block experimental design was used with four replications; treatments were […]

Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

Mirla Andrade Weber, João Mielniczukand, Carlos Gustavo Tornquist

12/May/2016

ABSTRACT The Century model has successfully simulated soil organic matter dynamics in many agroecosystems. However, initial applications in southern Brazil produced mixed results. The objective of this study was to calibrate and validate Century 4.5 to simulate soil carbon (C) and nitrogen (N) dynamics under diverse soil management practices in subtropical Brazil. Soil C and N data from two long-term experiments established on a degraded Acrisol in the early 1980s were used. Treatments were conventional or no-tillage; grass or grass/legume […]

Carbon and Nitrogen Dynamics under Eucalyptus Plantations in Southern Brazil

Charlote Wink, Dalvan José Reinert, Carlos Gustavo Tornquist, Ivo Ribeiro Silva

01/Dec/2015

ABSTRACT The expansion of eucalyptus plantations in southern Brazil, especially over regions with natural grasslands, which occurred in the last decade potentially changes total organic carbon and nitrogen in soil. The aim of this study was to test the Century model 4.5 in the simulation of changes in inventories of TOC and TN in the surface layer (0.0-0.2 m) soil in Eucalyptus sp. com different ages in three municipalities in Rio Grande do Sul State, Brazil. Areas adjacent to grasslands […]

CHEMICAL AND PHYSICAL PROPERTIES OF SOIL UNDER VEGETABLE CROPPING IN WATERSHEDS, AFTER ENVIRONMENTAL DISASTER

Celeste Queiroz Rossi, Marcos Gervasio Pereira, Adriana Maria de Aquino, Sandra Santana de Lima, Ricardo Luis Louro Berbara

01/Dec/2015

ABSTRACT Soil organic matter is an important primary source of nutrients for plants and influences infiltration, water retention, susceptibility to erosion, and soil aggregation. However, this process is conditioned on the quality and quantity of organic matter supplied. The objective of this study was to evaluate the influence of the environmental disaster caused by rain in areas of horticulture production in the mountainous region of Rio de Janeiro. The following areas were selected: A1- no impact (control); A2 – totally […]

ORGANIC CARBON CONTENTS AND STOCKS IN PARTICLE SIZE FRACTIONS OF A TYPIC HAPLUDOX FERTILIZED WITH PIG SLURRY AND SOLUBLE FERTILIZER

Maria Sueli Heberle Mafra, Paulo Cezar Cassol, Jackson Adriano Albuquerque, Marco André Grohskopf, Andreia Patrícia Andrade, Luiz Paulo Rauber, [...]

01/Jul/2015

The use of pig slurry (PS) as fertilizer can affect the soil quality and increase total stocks of soil organic carbon (TOC). However, the effects of PS on TOC amount and forms in the soil are not fully understood, particularly in areas under no-tillage (NT). The purpose of this study was to determine TOC contents and stocks in the particulate (POC) and mineral-associated C fractions (MAC) of an Oxisol after nine years of maize-oat rotation under NT, with annual applications […]

CHARACTERIZATION OF HEADWATERS PEATS OF THE RIO ARAÇUAÍ, MINAS GERAIS STATE, BRAZIL

Diêgo Faustolo Alves Bispo, Alexandre Christofaro Silva, Cristiano Christofaro, Max Leandro Naves Silva, Maurício Soares Barbosa, Bárbara Pereira Christofaro Silva, [...]

01/Mar/2015

Peatlands are soil environments that accumulate water and organic carbon and function as records of paleo-environmental changes. The variability in the composition of organic matter is reflected in their morphological, physical, and chemical properties. The aim of this study was to characterize these properties in peatlands from the headwaters of the Rio Araçuaí (Araçuaí River) in different stages of preservation. Two cores from peatlands with different vegetation types (moist grassland and semideciduous seasonal forest) from the Rio Preto [Preto River] […]

DISTRIBUTION OF ORGANIC CARBON IN DIFFERENT SOIL FRACTIONS IN ECOSYSTEMS OF CENTRAL AMAZONIA

Jean Dalmo de Oliveira Marques, Flávio Jesus Luizão, Wenceslau Geraldes Teixeira, Max Sarrazin, Sávio José Filgueira Ferreira, Troy Patrick Beldini, [...]

01/Jan/2015

Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system […]