Aeschynomene overseeding and nitrogen fertilization effects in bahiagrass litter decomposition

Author:

Garzon Jaime1ORCID,Vendramini Joao M. B.2ORCID,Silveira Maria L.2ORCID,Dubeux Jose Carlos B.3ORCID,Sollenberger Lynn E.4ORCID,Liao Hui‐Ling5,da Silva Hiran M. S.2ORCID,Gomes Vinicius C.2,Oliveira Hugo M. R.6,Moriel Philipe2

Affiliation:

1. University of Maine Cooperative Extension Orono Maine USA

2. Range Cattle Research and Education Center University of Florida Ona Florida USA

3. North Florida Research and Education Center University of Florida Marianna Florida USA

4. Agronomy Department University of Florida Gainesville Florida USA

5. North Florida Research and Education Center University of Florida Quincy Florida USA

6. Departamento de Zootecnia Universidade Federal do Norte do Tocantins Araguaina Tocantins Brazil

Abstract

AbstractProductivity of tropical and subtropical grasslands is often limited by inadequate nitrogen (N) supply. Aeschynomene (Aeschynomene americana L.) is a warm‐season legume that may contribute as N input in grazing systems, but there is limited information about aeschynomene litter decomposition and N dynamics on pastures. The objective of this study was to quantify the effect of overseeding aeschynomene or applying N fertilizer to existing bahiagrass (Paspalum notatum Flüggé) on litter disappearance and decomposition rates. The study was conducted in Ona, FL, from October 2019 to May 2020 and October 2020 to May 2021. Treatments were the split‐plot arrangement of bahiagrass‐aeschynomene or bahiagrass monoculture (main plot) and N fertilization level, (0 [control] or 60 kg N ha−1) as subplot, distributed in a randomized complete block design with four replicates. The nylon bag technique was used to estimate organic matter (OM), N and carbon (C) disappearance, and lignin concentration for 184 days of incubation. Bahiagrass‐aeschynomene had greater OM disappearance (from 330 to 356 g kg−1 OM) and was driven by C disappearance. Nitrogen fertilization did not impact litter decomposition responses, except for C:N ratio. Overseeding aeschynomene is an effective management practice to increase OM decomposition and optimize nutrient cycling in warm‐season pastures.

Funder

Florida Agricultural Experiment Station

Publisher

Wiley

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