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

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 (%P), S (%S) and N (%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%). 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.

Bibliographic Details

Main Authors:	Salvagiotti, Fernando, Ferraris, Gustavo Nestor, Quiroga, Alberto Raul, Barraco, Miriam Raquel, Vivas, Hugo Silverio, Prystupa, Pablo, Echeverria, Hernan Eduardo, Gutierrez Boem, Flavio Hernán
Format:	info:ar-repo/semantics/artículo biblioteca
Language:	eng
Published:	2012-08
Subjects:	Azufre, Deficiencia de Minerales, Soja, Semillas, Nitrógeno, Sulphur, Mineral Deficiencies, Soybeans, Seed, Nitrogen,
Online Access:	https://www.sciencedirect.com/science/article/pii/S0378429012002377#! http://hdl.handle.net/20.500.12123/2267 https://doi.org/10.1016/j.fcr.2012.07.011
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