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Identifying sulfur deficient fields by using sulfur content; N:S ratio and nutrient stoichiometric relationships in soybean seeds

Colaborador(es): Salvagiotti, Fernando | Ferraris, Gustavo Néstor | Quiroga, Alberto Raúl | Barraco, Mirian | Vivas, Hugo S | Prystupa, Pablo | Echeverría, Hernán Eduardo | Gutiérrez Boem, Flavio Hernán.
ISSN: 0378-4290.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): N:S RATIO | NITROGEN | PHOSPHORUS | SOYBEAN | STOICHIOMETRIC RELATIONSHIPS | SULFUR | ACCUMULATION | AGRICULTURAL MANAGEMENT | FERTILIZER APPLICATION | FIELD SURVEY | SEED | SOIL TEST | STOICHIOMETRY | ARGENTINA | PAMPAS | GLYCINE MAX | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Field Crops Research vol.135 (2012), p.107-115Resumen: Sulfur [S] fertilization has increasingly become an important issue in crop management. In Argentina S deficiencies have been reported, but there has been no success in finding soil tests for predicting soybean response to S fertilization. The objectives of this study were to: [i] evaluate seed S and N:S ratio as a tool for identifying S deficient soybean crops in field conditions and [ii] determine shifts in stoichiometric relationships among nitrogen [N], phosphorus [P] and S in soybean seeds which can be used for identifying S responsive sites under field conditions. Seed samples from 20 field experiments designed to explore response to S fertilization in soybean were collected in a large area in the Argentinean Pampas region. Seed yield [SY] and P [percent P], S [percent S] and N [percent N] concentration in seeds were determined. Different data analyses were tested in order to find an S deficiency index. Moderate SY responses to S fertilization were observed in the present study [i.e. relative SY was never below 75 percent]. seed S concentration increased in response to S fertilization in most responsive sites, and N:S ratio was governed by variations in seed S concentration. Stoichiometric relationships were more accurate for identifying S responsive sites than using single variables [e.g. seed S concentration or N:S]. The isometric variations among N, P and S suggest that the accumulation of these nutrients is proportional in seed tissue. A significant increase in the intercept of the stoichiometric relationship between N and S in S deficient crops was observed. An S deficient index [SDI] was calculated based on this difference that can be used as a diagnostic tool for identifying S responsive sites in soybean. The present study shows a novel approach for using stoichiometric concepts in fertilizer management in soybean.
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Sulfur [S] fertilization has increasingly become an important issue in crop management. In Argentina S deficiencies have been reported, but there has been no success in finding soil tests for predicting soybean response to S fertilization. The objectives of this study were to: [i] evaluate seed S and N:S ratio as a tool for identifying S deficient soybean crops in field conditions and [ii] determine shifts in stoichiometric relationships among nitrogen [N], phosphorus [P] and S in soybean seeds which can be used for identifying S responsive sites under field conditions. Seed samples from 20 field experiments designed to explore response to S fertilization in soybean were collected in a large area in the Argentinean Pampas region. Seed yield [SY] and P [percent P], S [percent S] and N [percent N] concentration in seeds were determined. Different data analyses were tested in order to find an S deficiency index. Moderate SY responses to S fertilization were observed in the present study [i.e. relative SY was never below 75 percent]. seed S concentration increased in response to S fertilization in most responsive sites, and N:S ratio was governed by variations in seed S concentration. Stoichiometric relationships were more accurate for identifying S responsive sites than using single variables [e.g. seed S concentration or N:S]. The isometric variations among N, P and S suggest that the accumulation of these nutrients is proportional in seed tissue. A significant increase in the intercept of the stoichiometric relationship between N and S in S deficient crops was observed. An S deficient index [SDI] was calculated based on this difference that can be used as a diagnostic tool for identifying S responsive sites in soybean. The present study shows a novel approach for using stoichiometric concepts in fertilizer management in soybean.

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