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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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Sticky Nightshade Infestation and Dispersion on an Integrated Soybean-Eucalyptus System at Subtropical Brazil Planta Daninha
DEISS,L.; MORAES,A.; PELISSARI,A.; PORFÍRIO-DA-SILVA,V.; DOMINSCHEK,R..
ABSTRACT: Trees in integrated crop-livestock systems can reduce infestation and dispersion of weeds because of a negative interference promoted by competition for light, water and nutrients. The objective of this study was to evaluate the infestation and dispersion of sticky nightshade (Solanum sisymbriifolium) in soybean in different positions between eucalyptus (Eucalyptus dunnii) double rows [20 m x (4 m x 3 m)] in an integrated crop-livestock system at Subtropical Brazil. The experiment was conducted in a randomized block design, with nine replications, and five equidistant positions between double rows (n=45) as treatments. Sticky nightshade was evaluated for infestation through biomass, plant density (reproductive and vegetative plants), and for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Integrated crop-livestock systems; Weed; Alley cropping; Ecophysiology; Agroforestry.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100207
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Weed Seed Bank in an Agroforestry System With Eucalyptus in Subtropical Brazil Planta Daninha
DEISS,L.; MORAES,A.; PELISSARI,A.; PORFÍRIO-DA-SILVA,V.; SCHUSTER,M.Z..
ABSTRACT : Trees can modify the weed seed bank composition and distribution in the cropped area of an agroforestry system. This study aimed at analyzing the eucalyptus (Eucalyptus dunnii) effect on spatial distribution, functional traits abundance and weed seed bank botanic composition in an agroforestry system under no-tillage in Subtropical Brazil. The experiment was conducted in a randomized block design with five replications, and five positions between 4.5-year-old eucalyptus double rows [(4x3) x 20 m] as treatments. Soil sampling was performed at 0-20 cm and the method to quantify and identify seeds was the seedling emergence in trays, inside a greenhouse. Weed phytosociological indices (relative density, frequency and importance), functional traits...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alley cropping; Phytosociology; Integrated weed management; Integrated crop-livestock systems; Functional traits; Spatial distribution patterns.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100222
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