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All publications of “Sandro José Giacomini”

15 results

Nitrous Oxide Emissions in No-Tillage Onion ( Allium cepa L.) Crops Are Increased by Oilseed Radish Cover Crop and Poultry Manure Application

Vilmar Müller Júnior ORCID logo , Leoncio de Paula Koucher, Monique Souza, Andria Paula Lima, Claudinei Kurtz, Rafael da Rosa Couto, [...]


ABSTRACT The use of cover crops and poultry manure (PM) is an alternative to reduce the use of synthetic inputs and can contribute to the nutrient cycling in onions ( Allium cepa L.) grown under a no-tillage system. However, this management practice may contribute to an increase in N2O emissions to the atmosphere. The aims of this study were to evaluate the immediate effect on N2O emissions of adding PM onto cover crop residues and to verify the effect of […]

Root and Shoot Contribution to Carbon and Nitrogen Inputs in the Topsoil Layer in No-Tillage Crop Systems under Subtropical Conditions

Marciel Redin, Sylvie Recous, Celso Aita, Bruno Chaves, Ismael Cristiano Pfeifer, Leonardo Mendes Bastos, [...]


ABSTRACT Recycling of carbon (C) and nitrogen (N) from plants into soils is decisive for maintaining soil organic matter and soil fertility. Therefore, we quantified plant biomass and C and N in the shoots and roots from the topsoil layer for a wide range of annual crops grown under subtropical conditions. We grew 26 species, 13 main crops, and 13 cover crops, in the field in standard sowing arrangements. Root biomass was recovered from the 0.00-0.20 m soil layer at […]

Nitrous Oxide Emissions in a Wheat/Corn Succession Combining Dairy Slurry and Urea as Nitrogen Sources

Celso Aita, Felipe Tonetto, Rogerio Gonzatto, Stefen Barbosa Pujol, Janquieli Schirmann, Juliano dos Santos Depoi, [...]


ABSTRACT: The impact on nitrous oxide (N2O) emissions caused by combining dairy slurry (DS) and urea to supply crops with nitrogen (N) is still not well characterized. The main objective of this study was to compare the differences between N2O emissions in the cases of exclusive use of urea and the combined use of DS and urea as N sources to no-tillage wheat and corn. We also compared N2O emissions between two DS application methods (surface-broadcast vs. injection), as well […]

Field 13C Pulse Labeling of Pea, Wheat, and Vetch Plants for Subsequent Root and Shoot Decomposition Studies

Majid Mahmood Tahir, Sylvie Recous, Celso Aita, Ismael Cristiano Pfeifer, Bruno Chaves, Sandro José Giacomini


ABSTRACT Isotopic labeling of plants is useful in tracking the fate of carbon (C) from different plant parts in a soil-plant system when these parts decompose simultaneously. Pulse labeling is a relatively simple technique and is amenable for use in the field. Therefore, we evaluated a 13CO2 pulse-labeling method to label crop plants under subtropical field conditions for simultaneous root and shoot decomposition studies. Wheat (Triticum aestivum L.), pea (Pisum sativum L.), and vetch (Vicia sativa L.) plants were grown […]

Nitrogen Transfer from Cover Crop Residues to Onion Grown under Minimum Tillage in Southern Brazil

Leoncio de Paula Koucher, Gustavo Brunetto, Vilmar Müller, Monique Souza, Andria Paula Lima, Sandro José Giacomini, [...]


ABSTRACT Nitrogen derived from cover crop residues may contribute to the nutrition of onion grown under minimum tillage (MT) and cultivated in rotation. The aim of this study was to evaluate the N transferred from different cover crop residues to the onion crop cultivated under MT in southern Brazil. In June 2014, oilseed radish, black oat, and oilseed radish + black oat residues labeled with 15N were deposited on the soil surface before transplanting onions. During the growth season and […]

Carbon and Nitrogen Mineralization in Soil Combining Sewage Sludge and Straw

Sandro José Giacomini, Vera Lúcia Guedes Simon, Celso Aita, Leonardo Mendes Bastos, Douglas Adams Weiler, Marciel Redin


ABSTRACT The combined incorporation of sewage sludge (SS) and oat straw (OS) to the soil can increase straw carbon mineralization and microbial nitrogen immobilization. This hypothesis was tested in two laboratory experiments, in which SS was incorporated in the soil with and without OS. One treatment in which only straw was incorporated and a control with only soil were also evaluated. The release of CO2 and mineral N in the soil after organic material incorporation was evaluated for 110 days. […]

Nitrification inhibitor and split applications of pig slurry to corn and wheat

Janquieli Schirmann, Celso Aita, Sandro José Giacomini, Stefen Barbosa Pujol, Diego Antônio Giacomini, Rogério Gonzatto, [...]


In areas of intensive pig production, pig slurry is used as an important nitrogen (N) source of crops, but is also a major cause of soil, air and water pollution. Strategies are required to reduce N losses from this organic material to the environment and to improve the agronomic efficiency as plant N source. The purpose of this study was to evaluate the effect of the use of a nitrification inhibitor (NI) and the split application of pig slurry (PS) […]

Biomass and decomposition of cover crop residues in monoculture and intercropping

Alexandre Doneda, Celso Aita, Sandro José Giacomini, Ezequiel Cesar Carvalho Miola, Diego Antonio Giacomini, Janquieli Schirmann, [...]


The use of cover crops in autumn/winter, in the Planalto region of Rio Grande do Sul, contributes to the success of the no-tillage system. However, information about the biomass production and decomposition of such species in the region is still scarce, especially for cover crop species in consortium. The experiment was conducted in Não-Me-Toque, RS, on an Oxisol, evaluating nine treatments of four cover crops in monoculture [rye (Secale cereale L.), oat (Avena strigosa Schreb), pea (Pisum sativum subsp. arvense), […]

Ammoniacal nitrogen immobilization from pig slurry in soil under reduced and no-tillage

Sandro José Giacomini, Celso Aita, Claudia Pozzi Jantalia, Segundo Urquiaga, Gabriel Franceschi dos Santos


The use of pig slurry in no-tillage systems on cultural residues with high C/N ratio is becoming a common practice in the center-south of Brazil. Two experiments were conducted to evaluate the immobilization of ammonium N applied with pig slurry to the soil. One experiment was run in the field and the other in laboratory conditions, both on a Hapludalf soil. The treatments consisted of pig slurry application with and without oat straw, with (reduced tillage) and without (no-tillage) soil […]

Carbon mineralization of straw and pig manure with and without incorporation in soil

Sandro José Giacomini, Celso Aita, Ezequiel César Carvalho Miola, Sylvie Recous


The C mineralization of pig manure and cereal straw is still relatively little studied in Brazil. The aim of this work was to evaluate C mineralization of oat straw, pig slurry and pig deep-litter, applied on the surface or incorporated in a Hapludalf soil, in laboratory conditions. The experiment was a completely randomized design with four replications of the following treatments: soil; soil + incorporated straw; soil + surface straw; soil + incorporated pig deep-litter; soil + surface pig deep-litter; […]

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