Data/hora: 01/06/2024 02:27:09

Biblioteca(s): | Embrapa Agrossilvipastoril; Embrapa Pesca e Aquicultura.
Data corrente: | 13/03/2012
Data da última atualização: | 19/11/2012
Autoria: | LARA, M. A. S.; PEDREIRA, C. G. S.; BOOTE, K. J.; PEDREIRA, B. C. e; MORENO, L. S. de B.; ALDERMAN, P. D.
Afiliação: | BRUNO CARNEIRO E PEDREIRA, CPAMT; LEONARDO SIMOES DE BARROS MORENO, CNPASA.
Título: | Predicting Growth of Panicum maximum: An Adaptation of the CROPGRO?Perennial Forage Model
Ano de publicação: | 2012
Fonte/Imprenta: | Agronomy Journal (Print), v. 104, n. 3, p. 600-611, 2012
Volume: | 104
Páginas: | 600-611
ISSN: | 1435-0645
Idioma: | Inglês
Conteúdo: | Warm-season grasses are economically important for cattle production in tropical regions and tools to aid in management and research on these forages would be highly beneficial both in research and the industry. This research was conducted to adapt the CROPGRO?Perennial Forage model to simulate growth of the tropical species guineagrass (Panicum maximum Jacq. cv. ?Tanzânia?) and to describe model adaptation for this species. To develop the CROPGRO parameters for this species, we began with values and relationships reported in the literature. Some parameters and relationships were calibrated by comparison with observed growth, development, dry matter accumulation, and partitioning during a 17-mo experiment with Tanzânia guineagrass in Piracicaba, SP, Brazil. Compared with starting parameters for palisadegrass [Brachiaria brizantha (A. Rich.) Stapf. cv. ?Xaraes?], dormancy effects of the perennial forage model had to be minimized, partitioning to storage tissue or root decreased, and partitioning to leaf and stem increased to provide for more leaf and stem growth and less root. Parameters affecting specific leaf area and senescence of plant tissues were improved. After these changes were made to the model, biomass accumulation was better simulated, mean predicted herbage yield was 6576 kg ha?1, averaged across 11 regrowth cycles of 35 (summer) or 63 d (winter), with a RMSE of 494 kg ha?1 (Willmott's index of agreement d = 0.985, simulated/observed ratio = 1.014). The model also gave good predictions against an independent data set, with similar RMSE, ratio, and d. The results of the adaptation suggest that the CROPGRO model is an efficient tool to integrate physiological aspects of guineagrass and can be used to simulate growth.
Palavras-Chave: | CROPGRO.
Thesagro: | Panicum Maximum; Planta forrageira; Simulação.
Thesaurus Nal: | Forage; Models; Pasture plants.

Categoria do assunto:

--
L Ciência Animal e Produtos de Origem Animal

Registro original: | Embrapa Agrossilvipastoril (CPAMT)

Exemplares:

CNPASA - (56-1) - UPC - AP - PP - CNPASA-SP04 -  - 2012.004 - DIS
CPAMT - (62-1) - UPC - AP - DD -  -  -  - DIS