Data/hora: 17/06/2024 03:18:01

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	14/02/1996	
Data da última atualização: 	14/02/1996	
Autoria: 	FICK, G. W.	
Título: 	A pasture production model for use in a whole farm simulator.	
Ano de publicação: 	1980	
Fonte/Imprenta: 	Agricultural Systems, v.5, n.2, p.137-161, 1980.	
Idioma: 	Inglês	
Conteúdo: 	Modular simulation models of crop and animal enterprises can be used in concert to simu-
late a particular whole farm operation and thus provide management information for indivi-
dual farmers and farm advisers. This paper reports the development of a pasture module for such a whole farm simulator designed to study irrigation management in New Zealand. The model (CANPAS) describes the production of perennial ryegrass/white clover pasture under either dryland or irrigated conditions. Seasonal growth studies and the principles of ecological physiology form the theoretical base of CANPAS. Whenever possible, parts of other models were also used. With time steps of one day, CANPAS predict the net above- ground yield of live and dead herbage digestibility, leaf area index and soil water supply. Harvested yields are also predicted for simulated grazing or cutting managements, assu-
ming part of the above-ground yield of live and dead herbage is left as stubble. Field mea-
surements of harvested pasture yields from the Canterbury Plains of New Zealand were used to validate the model. Validation procedure included the use of a simple set of statis-
cal tests. The final (CANPAS III) gave an overall r2 of 0.83, but poorer performance was 
found under some test managements. Discussion covers the general aspects of this kind of modelling as well as the specific detais of the pasture module.	
Palavras-Chave: 	Modular simulation models; Pasture; Production.	
Thesagro: 	Irrigação; Modelo de Simulação; Pastagem; Produção.	
Thesaurus Nal: 	irrigation.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (30766-1) - ADD - SP - -- - SP1772 -  - 1772 - DIS