Data/hora: 05/06/2024 17:02:35

Biblioteca(s): | Embrapa Soja.
Data corrente: | 22/02/2005
Data da última atualização: | 30/06/2005
Autoria: | HITSUDA, K.; SFREDO, G. J.; KLEPKER, D.
Título: | Diagnosis of sulfur deficiency in soybean using seeds.
Ano de publicação: | 2004
Fonte/Imprenta: | Soil Science Society of America Journal, Madison, v. 68, p.1445-1451, July/Ago. 2004.
Idioma: | Inglês
Conteúdo: | The objectives of this study were to obtain a reliable index for the evaluation of the S nutrition status in soybean [Glycine Max (L.) Merr.] and to identify the critical S level in relation to seed yield and quality. Two Oxisols were used: A-horizon soil from Serra dos Gerais, and A- and B-horizon soils from Sambaiba in Maranhão State, Brazil. Soybean plants in pots were grown in a greenhouse with the supply of 0 to 80 mg S kg-1 soil. The seed S concentration was a more reliable index of seed yield because of the higher correlation between S concentration and yield. In the plants with visible symptoms of S deficiency, the seeds contained 1.5 g S kg-1, and the seed yield was 60% of the control. Electrophoresis analysis indicated that the critical seed S concentration for deficiency of protein components was 2.0 g kg-1 when the yield was 80% of the control. The S concentration was 2.3 g kg-1 or higher for >90% yield when the composition of the protein components was identical with that in the original seeds obtained under sufficient S fertilization. We classified the S concentration in the seeds as: deficient (S < 1.5 g kg-1), very low (1.5  S < 2.0 g kg-1), low (2.0  S < 2.3 g kg-1), and normal (2.3 g kg-1  S). Because of stable S concentration, easy sampling, and sufficient time for planning of fertilizer application for the subsequent cropping, seed analysis is preferable to leaf analysis.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (24781-1) - UPC - SP - -- - 10237 -  - 10237 - DIS