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Soil sulfur fractions dynamics and distribution in a tropical grass pasture amended with nitrogen and sulfur fertilizers

Schmidt, Fábiana; De Bona, Fabiano Daniel; Silveira, Cristiane Prezotto; Monteiro, Francisco Antonio Universidade De São Paulo

JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE, MALDEN, v. 175, n. 1, pp. 60-67, FEB, 2012

WILEY-BLACKWELL; MALDEN 2012

Acesso online

  • Título:
    Soil sulfur fractions dynamics and distribution in a tropical grass pasture amended with nitrogen and sulfur fertilizers
  • Autor: Schmidt, Fábiana; De Bona, Fabiano Daniel; Silveira, Cristiane Prezotto; Monteiro, Francisco Antonio
  • Universidade De São Paulo
  • Assuntos: Brachiaria Decumbens; Fertilization; Sulfur Fractionation; Tropical Soil; Forest Soils; Organic-C; Transformations; Additions; Quality; Carbon; Plants; Agronomy; Plant Sciences; Soil Science
  • É parte de: JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE, MALDEN, v. 175, n. 1, pp. 60-67, FEB, 2012
  • Descrição: Soil sulfur (S) partitioning among the various pools and changes in tropical pasture ecosystems remain poorly understood. Our study aimed to investigate the dynamics and distribution of soil S fractions in an 8-year-old signal grass (Brachiaria decumbens Stapf.) pasture fertilized with nitrogen (N) and S. A factorial combination of two N rates (0 and 600?kg N ha1 y1, as NH4NO3) and two S rates (0 and 60?kg S ha1 y1, as gypsum) were applied to signal grass pastures during 2 y. Cattle grazing was controlled during the experimental period. Organic S was the major S pool found in the tropical pasture soil, and represented 97% to 99% of total S content. Among the organic S fractions, residual S was the most abundant (42% to 67% of total S), followed by ester-bonded S (19% to 42%), and C-bonded S (11% to 19%). Plant-available inorganic SO4-S concentrations were very low, even for the treatments receiving S fertilizers. Low inorganic SO4-S stocks suggest that S losses may play a major role in S dynamics of sandy tropical soils. Nitrogen and S additions affected forage yield, S plant uptake, and organic S fractions in the soil. Among the various soil fractions, residual S showed the greatest changes in response to N and S fertilization. Soil organic S increased in plots fertilized with S following the residual S fraction increment (16.6% to 34.8%). Soils cultivated without N and S fertilization showed a decrease in all soil organic S fractions.
    FAPESP (The State of Sao Paulo Research Foundation)
    CNPq (The Brazilian National Council for Scientific and Technological Development)
  • DOI: 10.1002/jpln.201100097
  • Títulos relacionados: JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
  • Editor: WILEY-BLACKWELL; MALDEN
  • Data de publicação: 2012
  • Idioma: Inglês

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