N:P:S stoichiometry in grains and physiological attributes associated with grain yield in maize as affected by phosphorus and sulfur nutrition
Balanced nutrition is necessary to reduce yield gaps in maize. Simultaneous phosphorus (P) and sulfur(S) deficiencies may be present in soils, so a P × S interaction is expected. In maize, yield is closely relatedto grain number (GN); thus, nutrient deficiencies impacting crop growth during GN forma...
| Otros Autores: | , , , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2017salvagiottifernando.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | Balanced nutrition is necessary to reduce yield gaps in maize. Simultaneous phosphorus (P) and sulfur(S) deficiencies may be present in soils, so a P × S interaction is expected. In maize, yield is closely relatedto grain number (GN); thus, nutrient deficiencies impacting crop growth during GN formation can con-sequently impact yields. Grain nutrient concentration may reflect soil supplying capacity, and nutrientstoichiometry in grains can be used as an indirect indicator of nutrient deficiency for a retrospectivediagnosis of sites responsive to P or S fertilization. The objectives of this study were to: i) determinemaize response to increasing S fertilizer rates and to P addition; ii) analyze the effects of P, S, and theirinteraction on mechanisms involved in yield determination of maize; and iii) evaluate the effects of Pand S shortage on stoichiometric relationships among N, P, and S content in maize grains. Two fertiliza-tion experiments were conducted on-farming conditions in 19 sites-year (SY) for analyzing grain yieldresponse to increasing S fertilizer rates (E1), and studying the interaction between P and S fertilization ongrain yield and physiological attributes associated with grain yield determination (E2), i.e. CGRCP, IPARCP,RUECPand biomass at R6. Also N (%N), S (%S) and P (%P) concentration in grains were determined. Stoi-chiometric relationships among N, P and S in both P or S fertilized and unfertilized treatments in all SYwere analyzed. Average grain yield response due to S and P addition was ca. 13 and 20%, respectively.Grain yield increased up to S fertilizer rates around 10 kg S ha−1. P addition increased CGRCPby 15–60%in 8 SY while S addition 12–16% in 2 SY. Both, RUECPand IPARCPwere positively associated with biomassproduction. P fertilization increased IPARCPby 4%, but no S effect was observed. Before silking, P additionboosted cumulated radiation by 7%, but after silking no P or S effects were observed. A significant P × Sinteraction was observed for RUECP, since S fertilization increased RUECPby 14% only when P was notadded. Independently of P or S shortage, grain N content scaled almost isometrically with grain S content,while N:P and P:S showed allometric relationships. Phosphorus deficiency did not modify N:S, N:P norP:S stoichiometry. Likewise, S addition did not modify the N:P or N:S stoichiometry. A significant changein the intercept of the P:S relationship was observed in response to fertilization and may be used as atool for identifying S responsive sites using grain nutrient analysis. |
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| ISSN: | 0378-4290 |