Data/hora: 21/06/2024 00:27:36

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Data corrente: 	12/12/2012	
Data da última atualização: 	16/02/2023	
Autoria: 	ARAUJO, L. C.; SANTOS, P. M.; RODRIGUEZ, D.; PEZZOPANE, J. R. M.; OLIVEIRA, P. P. A.; CRUZ, P. G.	
Afiliação: 	LEANDRO C. ARAUJO, ZOOTECNIA EALQ/PIRACICABA; PATRICIA MENEZES SANTOS, CPPSE; DANIEL RODRIGUEZ, Univ. of Queensland; JOSE RICARDO MACEDO PEZZOPANE, CPPSE; PATRICIA PERONDI ANCHAO OLIVEIRA, CPPSE; PEDRO G. CRUZ, ESALQ/PIRACICABA.	
Título: 	Simulating Guinea Grass production: empirical and mechanistic approaches.	
Ano de publicação: 	2013	
Fonte/Imprenta: 	Agronomy Journal, v. 105, n. 1, 2013.	
Páginas: 	p. 61-69.	
DOI: 	https://doi.org/10.2134/agronj2012.0245	
Idioma: 	Inglês	
Conteúdo: 	Tropical grasses are economically important for cattle production in Brazil and accurate simulation models for tropical pastures can benefit forage researchers and farm managers improve tropical forage production systems. This research calibrated and validated four modeling approaches of contrasting complexity to simulate mass production of Guineagrass (Panicum maximum Jacq. cv. ?Mombaça?). The models included three empirical agro-climatic models [i.e. a cumulative degree-day (DDi), a photo-thermal-units (PUi), and a climatic growth index (CGIi)]; and a bio-physical simulation model i.e. APSIM-Growth. Data sets for calibration and independent validation included records of frequent above-ground dry matter production over the 2005-2006 and 2010-2011 growing seasons from three trials. All models performed well during calibration (R2 = 0.78 - 0.86; and coefficient of variation = 26 - 32.1%). During model validation the R2 varied between 0.69 and 0.78; the agreement index was between 0.88 and 0.93; the coefficient of variation between 37.6 and 50.2%; and the mean bias error between 6 and 470 kg ha-1. Even though all models were in agreement between simulated and observed results, APSIM-Growth was able to simulate Guineagrass production across a broader climate range, soils and management (i.e. nitrogen fertilization) conditions.	
Palavras-Chave: 	Guinegrass production; Tropical pasture.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (21439-1) - UPC - AP - DD - PROCI-2012.00190 - ARA - 2012.00190 - DIS