Data/hora: 05/06/2024 17:56:23

Biblioteca(s): 	Embrapa Gado de Corte.	
Data corrente: 	15/06/2004	
Data da última atualização: 	15/06/2004	
Autoria: 	MACEDO, M. C. M.; ZIMMER, A.; MIRANDA, C. H. B.; COSTA, F. P.; KANNO, T.; BONO, J.; FUKUDA, E.	
Afiliação: 	Embrapa Gado de Corte (Campo Grande, MS).	
Título: 	Results of soybean yield, animal liveweiht gain and soil fertility changes in agro-pastoral systems.	
Ano de publicação: 	2004	
Fonte/Imprenta: 	In: SUENAGA, K.; OSHIBE, A.; TANIGUHI, T. (Ed.). Development of sustainable agro-pastoral systems in the subtropical zone of Brazil. Tsukuba: JIRCAS, 2004.	
Páginas: 	p. 15-18.	
Série: 	(JIRCAS. Working Report, 36). 	
Idioma: 	Inglês	
Notas: 	CNPGC. Proceedings of the Workshop on the results and prospects of comprehensive studies on the development of sustainable agro-pastoral systems in the subtropical zone of Brazil, 2003. 
	
Conteúdo: 	An experiment of agro-pastoral systems is being conducted by the National Beef Research Center (CNPGC), in Campo Grande, MS, Brazil, since 1993/94, in the region known as Cerrados (typical Savannas). The hypothesis tested is that agro-pastoral  systems could improve crop and animal production, being more profitable and sustainable than continuos and tradicional systems. Five farming systems are being tested: two traditional (continuous soybean annual cropping and continuous pastures cropping) and three agro-pastoral systems (two combinations of four by four years of rotational crop-pasture systems and one by three years of crop-pasture rotation). Sub-treatments  of different planing systems (traditional: disking only; dynamic and conservationist: disk plowing-moldboard plowing-subsoiling; and direct planting: no-tillage) and differen tropical forages (Brachiaria decumbens, B.Brizantha and Panicum maximum) are also studied. Continuous pasture cropping of B. decumbens has three sub-treatments: with and  without  maintenance fertilizar and maintenance fertilezer plus intercropped pasture legume: Syloshantes spp.  Two additional plots were included as treatment comparisons and to check for environmental impacts:  an area of degraded pasture and one of natural vegetation. After nine years of cropping, overall average soybean yields are ranking over 2500 kg/ha. Grain yield of soybean in continuous notillage system was  not different to continuous tillage systems.Soybean production in agro-pastoral systems differed between treatments, dependingupon residual soil fertility, climatic constraints (drought spells)  and competition by pasture regrow. Animal production in continuos pasture cropping measured as liveweight gain/ha (LWG) are declining along the years in the subtreatment without fertilizer maintenance. Agropastoral systems, in the other hand, have shown promising results of LWG, either in the one by three or inthe four by four cropping combination. Soil  fertility under continuous annual crops increased substantially. In crop/pasture rotation, soil fertility with grain crops, but decreased rapidly in subsequentgrazing systems with no fertilizer maintenance.	
Palavras-Chave: 	Agropastoral systems; Brasil; Brazilian savannas; Integração agricultura pecuária; Sustainability; Sustentabilidade.	
Thesagro: 	Bovino; Cerrado; Fertilidade; Ganho de Peso; Solo.	
Thesaurus Nal: 	Brazil; cattle; soil fertility; weight gain.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Gado de Corte (CNPGC)	
Exemplares: 	CNPGC - (10496-1) - UPC - PL - -- - 630 - S944d -  - DIS