Data/hora: 01/06/2024 18:11:15

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	16/11/1992	
Data da última atualização: 	27/10/2004	
Autoria: 	SUMMERFIELD, R. J.; ROBERTS, E. H.; LAWN, R. J.	
Afiliação: 	University of Reading, Depto Agriculture, Shinfield Grange, Shinfield, Reading RG2 9AD, UK.	
Título: 	Measurement and prediction of flowering in soybean in fluctuating field environments.	
Ano de publicação: 	1989	
Fonte/Imprenta: 	In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.	
Volume: 	t.1	
Páginas: 	p.82-87.	
Idioma: 	Inglês	
Conteúdo: 	Growth from (e.g. degree of determinateness) and phenology (i.e. progress through defined stages of development) in soybean re both inter-dependent and extremely plastic traits. Depending on the genotypes and on location and date of sowing, time to flowering has striking direct and more subtle indirect effects on morphology, and is also a strong determinant of relative maturity and date of harvest. Timely flowering, then, is important if soybean crops seeded at appropriate densities are to have the potential to yield well. Many stydies have shown that genotypic responsiveness to photoperiod (P) and/or mean temperature (T) combine to determine times from sowing to flowering (f). Neverthless, the traditional viewpoint has been that variations in f in relation tothe separate and interacting effects of P and T are often complex and so difficult to quantify and exploit. However, when these photothermal responses are considered as rates, i.e. the rate of progress towards flowering, 1/f, a much simpler (and plausible) alternative picture emerges. It is now clear that over wide ranges of each of P and T, the relations with 1/f are linear and without interaction. Thus, simple equations can bem used to predict 1/f, and therefore f, in natural environments where temperature fluctuates and photoperiod changes systematically with date. An ability to predict f in the field has important implications for agronomic management, in breeding ans selection, and in the evaluation and characterization of soybean germplasm.	
Palavras-Chave: 	Soybean.	
Thesagro: 	Fisiologia; Floração; Soja.	
Thesaurus Nal: 	flowering; physiology.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)