Data/hora: 24/09/2024 03:03:56

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	24/03/1993	
Data da última atualização: 	26/10/2004	
Autoria: 	BERGAMASHI, H.	
Título: 	Variations on the brazilian soybean production related to the drought occurences - preliminary analysis.	
Ano de publicação: 	1989	
Fonte/Imprenta: 	In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.	
Volume: 	t.5	
Páginas: 	p.2153-2158.	
Idioma: 	Inglês	
Conteúdo: 	According to the soybean production data in Brazil, two periods can be visualized, during the last 20 years. From 1968 to 1976 a great expansion in the harvested area occurred in the South region, being Rio Grande do Sul the first one on this process. From 1976 to 1988, another great expansion on the cropping area occurred in the tropical regions of Central Brazil. The soybean yield used to increase during a few years in the new cropping areas, and this should be atributed to both the soil conditions and the technological improvements. However, it seems that the technology wasn't enough to keep that yield levels and this fact can be due to the environmental limitations, mainly by climate and soil. The drought occurences used to reduce the brazilian soybean production. During the last 11 years, dry spells, interacting with the soil conditions, reduced the yield in about 20% in Rio Grande do Sul state, and about 10% in all over the Country. On the specific case of Rio Grande do Sul, it was observed that this yield losses overcome the increases due to the technological improvements during the 1968/76 period. It can be also observed that the global losses increased with the expansion of the harvested area, while the yield variations used to become lower. So, the data for a specific area seem to indicate a good relationship with the water balance conditions.	
Palavras-Chave: 	Brasil; Production; Rio Grande do Sul; Soybean; Yield.	
Thesagro: 	Ecologia; Produção; Rendimento; Soja.	
Thesaurus Nal: 	Brazil; ecology.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)