Mulch decomposition and nitrogen, phosphorus and potassium release in vetiver grass at different plant densities

ABSTRACT In order to meet the need for nutrients or soil cover, when plants are used as green manure, it is necessary to determine the ideal plant population, as well as the amount and duration of released nutrients. This study aimed to assess the decomposition and nitrogen (N), phosphorus (P) and p...

Full description

Saved in:
Bibliographic Details
Published in:Pesquisa agropecuária tropical Vol. 50; p. e64603
Main Authors: Rocha, Jaídson Gonçalves da, Coelho, Fábio Cunha, Lelis, Rosana Teixeira, Santos, Gabriela Carvalho de Souza, Jaeggi, Mario Euclides Pechara da Costa
Format: Journal Article
Language:English
Published: Escola de Agronomia/UFG 01-01-2020
Universidade Federal de Goiás
Subjects:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT In order to meet the need for nutrients or soil cover, when plants are used as green manure, it is necessary to determine the ideal plant population, as well as the amount and duration of released nutrients. This study aimed to assess the decomposition and nitrogen (N), phosphorus (P) and potassium (K) release rates of vetiver grass mulch. A split-plot arrangement was used, with the plots consisting of mulch decomposition times after cutting (0, 15, 25, 70 and 125 days) and the subplots of vetiver plant densities (1, 2, 3 and 4 plants m-2). A randomized block design was used, with four replications. The highest release rates for N, P and K were recorded during the first five days. The plant density of 3 plants m-2 exhibited the highest mulch dry weight at 125 days and contained more N, P and K, when compared to the populations of 1, 2 and 4 plants m-2. RESUMO A fim de atender a demanda de nutrientes ou cobertura do solo, quando se utilizam plantas para adubação verde, é necessário o conhecimento da adequada população de plantas, quantidade de nutrientes liberada e período de liberação. Objetivou-se verificar a taxa de decomposição e a liberação de nitrogênio (N), fósforo (P) e potássio (K) da palhada de capim-vetiver. Utilizou-se arranjo de parcelas subdivididas, sendo as parcelas constituídas por períodos de decomposição da palhada após o corte (0, 15, 25, 70 e 125 dias) e as subparcelas por populações de capim-vetiver (1, 2, 3 e 4 plantas m-2). O delineamento experimental foi em blocos casualizados, com quatro repetições. Para N, P e K, as maiores liberações ocorreram durante os primeiros cinco dias. A população de 3 plantas m-2 foi a que apresentou a maior massa seca de palhada aos 125 dias, e a mesma continha mais N, P e K, se comparada às populações de 1, 2 e 4 plantas m-2.
ISSN:1517-6398
1983-4063
1983-4063
DOI:10.1590/1983-40632020v5064603