Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

Author:

Silveira Cristiane Prezotto1,Oliveira Daniela Alves de1,Bonfim-Silva Edna Maria2,Monteiro Francisco Antonio2

Affiliation:

1. Universidade de São Paulo

2. Universidade de São Paulo, Brasil

Abstract

The objective of this research was to evaluate the effect of combinations of nitrogen and sulfur rates in degraded signal grass (Brachiaria decumbens) pasture on their productive, morphological and nutritional attributes in the root system at four soil depths. The pasture used in the experiment was established over eight years ago in Entisol. Five nitrogen rates (0; 150; 300; 450 and 600 kg/ha/year) and five sulfur rates (0; 15; 30; 45 and 60 kg/ha/year) were combined in a fractionated factorial in a randomized block design, with three replications. Nitrogen was supplied as ammonium nitrate and sulfur as gypsum, and the rates were split into three times in the rainy season. The evaluations occurred at intervals of 35 days during the rainy season and 56 days in the dry season, in two consecutive years. Roots were collected with a 4-cm diameter auger at 0-10; 10-20; 20-30 and 30-40 cm soil depths. It was determined root dry matter, length and surface of the root system and nitrogen and sulfur concentrations in roots. Nitrogen rates applied in two consecutive years in the pasture affected dry mass, length, surface and nitrogen concentration in signal grass root system. Rates of sulfur by themselves or combined with nitrogen rates do not affect attributes of root system.

Publisher

FapUNIFESP (SciELO)

Subject

Animal Science and Zoology

Reference26 articles.

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3. Sistema radicular do capim-Marandu, considerando as combinações de doses de nitrogênio e de enxofre;BATISTA K.;Revista Brasileira de Ciência do Solo,2006

4. Nitrogênio e enxofre na adubação e em folhas diagnósticas e raízes do capim-braquiária em degradação;BONFIM-SILVA E.M.;Revista Brasileira de Zootecnia,2010

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