Data/hora: 05/06/2024 16:11:08

Biblioteca(s): 	Embrapa Solos / UEP-Recife; Embrapa Unidades Centrais.	
Data corrente: 	29/03/2011	
Data da última atualização: 	09/05/2018	
Autoria: 	BERGAMASCHI, H.; DALMAGO, G. A.; BERGONCI, J. I.; KRUGER, C. A. M. B.; HECKLER, B. M. M.; COMIRAM, F.	
Afiliação: 	Homero Bergamaschi, Universidade Federal do Rio Grande do Sul (UFRGS); GENEI ANTONIO DALMAGO, CNPT; João Ito Bergonci, UFRGS, Departamento de Botânica; Cleusa Adriane Menegassi Bianchi Krüger, Universidade Regional do Noroeste do Estado do Rio Grande do Sul (UNIJUI); Bruna Maria Machado Heckler, Empresa de Assistência Técnica e Extensão Rural; Flavia Comiran, Instituto Agronômico do Paraná.	
Título: 	Intercepted solar radiation by maize crops subjected to different tillage systems and water availability levels.	
Ano de publicação: 	2010	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 45, n. 12, p. 1331-1341, dez. 2010	
Idioma: 	Inglês	
Notas: 	Título em português: Radiação solar interceptada pela cultura do milho sob diferentes níveis de preparo do solo e disponibilidade hídrica.	
Conteúdo: 	Abstract - The objective of this work was to evaluate changes in the photosynthetic photon flux density (PPFD) interception efficiency and PPFD extinction coefficient for maize crop subjected to different soil tillage systems and water availability levels. Crops were subjected to no-tillage and conventional tillage systems combined with full irrigation and non-irrigation treatments. Continuous measurements of transmitted PPFD on the soil surface and incoming PPFD over the canopy were taken throughout the crop cycle. Leaf area index and soil water potential were also measured during the whole period. Considering a mean value over the maize cycle, intercepted PPFD was higher in the conventional tillage than in the no-tillage system. During the initial stages of plants, intercepted PPFD in the conventional tillage was double the PPFD interception in the no-tillage treatment. However, those differences were reduced up to the maximum leaf area index, close to tasseling stage. The lowest interception of PPFD occurred in the conventional tillage during the reproductive period, as leaf senescence progressed. Over the entire crop cycle, the interception of PPFD by the non-irrigated plants was about 20% lower than by the irrigated plants. The no-tillage system reduced the extinction coefficient for PPFD, which may have allowed a higher penetration of solar radiation into the canopy.	
Palavras-Chave: 	Photosynthetic photon flux density; Water deficit.	
Thesagro: 	Zea Mays.	
Thesaurus Nal: 	leaf area; no-tillage.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/105584/1/Intercepted-solar.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (49475-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS
CNPS-UEPR - (3054-1) - ADD - AP - PP - 633.15 - B493i - 2017.03599 - DIS