Data/hora: 03/06/2024 10:55:47

Provedor de dados: | 65
País: | Brazil
Título: | Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing
Autores: | Ramalho,Israel Oliveira; Rezende,Claudia de Paula; Pereira,José Marques; Macedo,Robert de Oliveira; Santos,Camila Almeida dos; Monteiro,Rafael Cassador; Alves,Bruno José Rodrigues; Carvalho,Isabel das Neves Oiticica de; Urquiaga,Segundo; Boddey,Robert Michael.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Urochloa brizantha; Decomposition constant; Methodological comparison.
Resumo: | ABSTRACT:  The objectives of this study were to determine the rates of plant litter deposition and decomposition in Marandu pastures (Urochloa brizantha cv. Marandu) under a) three forms of nitrogen (N) supply, b) at different stages of rotational grazing and c) to compare the single-exponential decay constant (‘k’) derived from litterbags with values derived from estimates of deposited and existing litter (DEL technique). The three N supply treatments were: without or with N fertilization (zero or 150 kg N ha-1 yr-1) or with the legume Desmodium ovalifolium. There were no significant differences (p&lt;0.05) between existing litter and rates of litter deposition and decomposition between the three N supply treatments. The litter decomposition rate was estimated using the DEL technique for the 7-day grazing periods and two subsequent 14-day periods in each 35-day grazing cycle. The litter decomposition rate was (P&lt;0.05) higher for the second rest period (days 21 to 35) at 0.089 g g-1 day-1, than for the grazing period (0.038 g g-1 day-1) and for the first rest period (0.040 g g-1 day-1). The mean half-life of the litter was 12 days using the DEL technique while the estimate from the litterbags was 136 days. Results showed that estimates provided by litterbags severely underestimate the decomposition in relation to the DEL technique and predict a long-term accumulation of litter which is not observed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200202
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20190266
Formato: | text/html
Fonte: | Ciência Rural  v.49 n.12 2019
Fonte: | info:eu-repo/semantics/openAccess