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Nitrogen dynamics in soil management systems. I - flux of inorganic nitrogen (NH4+ and NO3-) Rev. Bras. Ciênc. Solo
Sá,João Carlos de Moraes; Cardoso,Eduardo Garcia; Briedis,Clever; Ferreira,Ademir de Oliveira; Borszowskei,Paulo Rogério; Santos,Josiane Burkner; Massinham,Aline; Ferreira,Carla Fernanda; Siuta Júnior,Darci; Baranek,Edemar José; Piccolo,Marisa de Cássia; Pavei,Mariana; Urquiaga,Segundo.
In agricultural systems the N-NH4+ and N-NO3- contents is significantly affected by soil management. This study investigated the dynamics of inorganic nitrogen (N; NH4+ and NO3-) in an experimental evaluation of soil management systems (SMSs) adopted in 1988 at the experimental station of the ABC Foundation in Ponta Grossa, in the Central South region of the State of Paraná. The objective of this study was to evaluate the changes in N-NH4+ and N-NO3- flux in the surface layer of a Red Latosol arising from SMSs over a 12-month period. The experiment was arranged in a completely randomized block design in split plots, in three replications. The plots consisted of the following SMSs: 1) conventional tillage (CT); 2) minimum tillage (MT); 3) no-tillage with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: C; N conservation tillage systems no-tillage conventional tillage.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500018
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Nitrogen dynamics in soil management systems: II - mineralization and nitrification rates Rev. Bras. Ciênc. Solo
Cardoso,Eduardo Garcia; Sá,João Carlos de Moraes; Briedis,Clever; Ferreira,Ademir de Oliveira; Borszowskei,Paulo Rogério; Santos,Josiane Burkner; Massinham,Aline; Ferreira,Carla Fernanda; Siuta Júnior,Darci; Baranek,Edemar José.
Nitrogen is the main limiting factor in crop productivity and thereby soil management systems may change the mineralization and nitrification rates. In an experiment on soil management systems implemented in 1988 at the experimental station Fundação ABC, Ponta Grossa, in the central South region of the State of Paraná, inorganic N dynamics were examined to find a soil management strategy with a view to a sustainable environment. The objective of this study was to calculate the net mineralization and nitrification rates of soil N and the correlation with soil pH under management systems. Randomized complete block design was used, in split plots, in three replications. The following soil management systems (SMSs) were adopted in the plots: 1) conventional...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conservation systems; No-tillage; Conventional tillage; Soil pH.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500019
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Production, carbon and nitrogen in stover fractions of corn ( Zea mays L.) in response to cultivar development Ciência e Agrotecnologia
Barbosa,Julierme Zimmer; Ferreira,Carla Fernanda; Santos,Nicolas Zendonadi dos; Motta,Antonio Carlos Vargas; Prior,Stephen; Gabardo,Juarez.
ABSTRACT Changes in quantity and quality of corn crop stover can have a large impact on soil conservation and soil carbon (C) sequestration over large areas. The aim of this study was to evaluate changes in production, concentration and amount of C and nitrogen (N) in corn stover fractions due to cultivar development. Two field experiments were conducted in the city of Rolândia (Paraná State, Brazil) using ten cultivars representing five technological levels: single cross hybrids, double or triple hybrids, commercial varieties, and creole cultivars. Plant heights and stalk, leaf, cob, husk and tassel weights were determined at final harvest. Elemental C and N analyses were performed in triplicate for each stover fraction. In general, the creole cultivars...
Tipo: Info:eu-repo/semantics/article Palavras-chave: C/N ratio; Genetic breeding; No-tillage system; Integrated crop-livestock systems; Renewable energy.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000600665
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