Nitrogen and Sulfur Fertilization and Dynamics in a Brazilian Entisol under Pasture


Autoria(s): BONA, Fabiano Daniel De; MONTEIRO, Francisco Antonio
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2010

Resumo

Nutrient dynamics in tropical soils sustaining forage grasses are still poorly understood. We conducted a study to evaluate the effect of combined N and S fertilizer rates on the growth of `Marandu` palisade grass [Brachiaria brizantha (Hochst. ex A. Rich.) Stapf], uptake of these elements from the soil by plants, soil organic matter concentration, soil pH, and the mineral and organic fractions of N and S in an Entisol. Combinations of five N rates (0, 100, 200, 300, and 400 g N m(-3)) with five S rates (0, 10, 20, 30, and 40 g S m(-3)) were evaluated in a partial 5 x 5 factorial in a pot experiment, with and without plants. Nitrogen and S were supplied as NH(4)NO(3) and CaSO(4)center dot 2H(2)O, respectively. The N addition in excess did not enhance the palisade grass production due to low plant-available Sin the soil. The supply of low rates of S with N greatly improved the overall N uptake efficiency by the forage plant. The contents of total N, NO(3)(-)-N, and NH(4)(+)-N in the soil varied with N rate and with N uptake by the plants. The association of palisade grass with S fertilization increased the ester-bonded S fraction in the soil. The results suggest that soil residual S could be a potential source of S for plants. Proper N and S fertilizer rates promoted increased grass production due to increased uptake of these nutrients and the dynamics of the organic N and S fractions and mineral fractions in this tropical soil.

State of Sao Paulo Research Foundation (FAPESP)

Brazilian National Council for Scientific and Technological Development (CNPq)

Identificador

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, v.74, n.4, p.1248-1258, 2010

0361-5995

http://producao.usp.br/handle/BDPI/19232

10.2136/sssaj2009.0228

http://dx.doi.org/10.2136/sssaj2009.0228

Idioma(s)

eng

Publicador

SOIL SCI SOC AMER

Relação

Soil Science Society of America Journal

Direitos

restrictedAccess

Copyright SOIL SCI SOC AMER

Palavras-Chave #SOIL ORGANIC-MATTER #BRACHIARIA-HUMIDICOLA #NITRIFICATION INHIBITORS #TROPICAL GRASS #FRACTIONS #NITRATE #TRANSFORMATIONS #GROWTH #CARBON #PLANTS #Soil Science
Tipo

article

original article

publishedVersion