Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133518
Research center of Embrapa/Collection: Embrapa Pecuária Sudeste - Artigo em periódico indexado (ALICE)
Date Issued: 2021
Type of Material: Artigo em periódico indexado (ALICE)
Authors: BRUNETTI, H. B.
BOOTE, K. J.
SANTOS, P. M.
PEZZOPANE, J. R. M.
PEDREIRA, C. G. S.
LARA, M. A. S.
MORENO, L. S. de B.
HOOGENBOOM, G.
Additional Information: HENRIQUE B. BRUNETTI, USP-ESALQ; KENNETH J. BOOTE, UNIVERSITY OF FLORIDA; PATRICIA MENEZES SANTOS, CPPSE; JOSE RICARDO MACEDO PEZZOPANE, CPPSE; CARLOS G. S. PEDREIRA, USP-ESALQ; MÁRCIO A. S. LARA, UFLA; LEONARDO SIMOES DE BARROS MORENO, CNPASA; GERRIT HOOGENBOOM, UNIVERSITY OF FLORIDA.
Title: Improving the CROPGRO Perennial Forage Model for simulating growth and biomass partitioning of guineagrass.
Publisher: Agronomy Journal, 2021.
Pages: p.1-16.
Language: Ingles
Keywords: Mombaça
Stem biomass
Growth and biomass partitioning
Description: Tropical forage grasses are used for several applications including grazing, silage, and biofuels; with harvesting at varying phenological stages. Mechanistic simulation models can be powerful tools to assist with planning and decision making of pasture utilization strategies. The objective of this study was to improve and evaluate the ability of the Cropping System Model-CROPGRO-Perennial Forage model (CSMCROPGRO-PFM) to simulate growth and biomass partitioning of two guineagrass [Panicum maximum Jacq. syn. Megathyrsus maximus (Jacq.) BK Simon & SWL Jacobs] cultivars, Tanzânia and Mombaça. Data from two experiments with contrasting harvest management and field conditions were used. Model parameters were modified, targeting improvement in d-statistic and root mean square error (RMSE) for aboveground, leaf, stem biomass, leaf area index (LAI), and leaf proportion of aboveground biomass. Major improvement in model performance was achieved by modifying the vegetative partitioning parameters between leaf and stem through increasing partitioning to leaf during early regrowth while increasing it to stem during late regrowth. Modifications were made to parameters affecting leaf and stem senescence, leaf photosynthesis, and leaf area expansion sensitivity to cool weather. The RMSE values decreased from 2,261 to 1,768 kg ha?1 for aboveground biomass, from 1,620 to 874 kg ha?1 for stem biomass, from 11.41 to 7.27% for leaf percentage, from 1.91 to 1.68 for LAI, but increased slightly for leaf biomass. The d-statistic computed over all these variables increased from .86 to .93. The improved model performance for both short and long harvest cycles will facilitate further applications for diverse forage crops utilization strategies.
Thesagro: Panicum Maximum
Pastagem
NAL Thesaurus: Megathyrsus maximus
Tanzania
Forage crops
Data Created: 2021-08-12
Appears in Collections:Artigo em periódico indexado (CPPSE)

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