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

Mostrar otras versiones (1)

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 an...

Descripción completa

Guardado en:
Detalles Bibliográficos
Otros Autores: Salvagiotti, Fernando, Ferraris, Gustavo Néstor, Quiroga, Alberto Raúl, Barraco, Mirian, Vivas, Hugo S., Prystupa, Pablo, Echeverría, Hernán Eduardo, Gutiérrez Boem, Flavio Hernán
Formato: Artículo
Lenguaje:Inglés
Materias:
N:S RATIO
NITROGEN
PHOSPHORUS
SOYBEAN
STOICHIOMETRIC RELATIONSHIPS
SULFUR
ACCUMULATION
AGRICULTURAL MANAGEMENT
FERTILIZER APPLICATION
FIELD SURVEY
SEED
SOIL TEST
STOICHIOMETRY
ARGENTINA
PAMPAS
GLYCINE MAX
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Salvagiotti.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
Descripción
Sumario: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.
ISSN:0378-4290

Ejemplares similares