| Texto completo | |
| Autor(es): |
Soratto, Rogerio P.
[1, 2]
;
Sandana, Patricio
[3]
;
Fernandes, Adalton M.
[2]
;
Martins, Jessyca D. L.
[1]
;
Job, Andre L. G.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Sao Paulo State Univ, Coll Agr Sci, Dept Crop Sci, UNESP, Botucatu, SP - Brazil
[2] Sao Paulo State Univ, Ctr Trop Roots & Starches, UNESP, Botucatu, SP - Brazil
[3] Univ Austral Chile, Inst Plant Prod & Protect, Campus Isla Teja, Valdivia - Chile
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | EUROPEAN JOURNAL OF AGRONOMY; v. 115, APR 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
One of the challenges of potato (Solanum tuberosum L.) production is to minimize phosphorus (P) fertilization without negatively affecting the yield progress. Therefore, critical P dilution curves {[}P-c = a(c)W(-b); where P-c is the critical P concentration (%); a(c) is the critical plant P concentration (%) for a total dry matter (DM) biomass of 1 Mg ha(-1); W is the total DM biomass expressed in Mg ha(-1); and coefficient b is dimensionless and represents the ratio between the relative decline in plant P concentration and the relative crop growth rate] have been developed recently to improve P fertilization management in potatoes. The aim of this study was to test critical P dilution curves for potato cultivated in Sao Paulo State, southeastern Brazil. Nine field experiments were conducted in Oxisols with P-resin values ranging from 8 to 70 mg dm(-3) (very low to high). In each experiment, treatments were different P rates (ranging from 0 to 448 kg P ha(-1)) or the combination of different cultivars and P rates. Wide ranges in tuber DM yield (0.7-7.9 Mg ha(-1)) and plant P concentration (0.13-0.36 %) were observed before vine killing in response to P rates, cultivars, and site-years. Tuber DM yields were related to total DM biomass (R-2 = 0.98), while P uptake was related to both total DM biomass and total plant P concentration (p < 0.01). Relative tuber DM yields at harvest were closely related to P nutrition index (PNI) (p < 0.01, R-2 = 0.82) calculated with the critical P dilution curve previously reported for potato under higher yielding environments. These results validate the critical P dilution curve (P-c = 0.391W(-0.304)) as a useful diagnostic tool for improving the P fertilization of potato crops systems in the tropical region of Brazil. (AU) | |
| Processo FAPESP: | 10/04987-6 - Adubação fosfatada em cultivares de batata (Solanum tuberosum L.) |
| Beneficiário: | Adalton Mazetti Fernandes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 13/04682-9 - Adubação da cultura da batata (Solanum tuberosum L.) com fósforo e silício |
| Beneficiário: | Rogério Peres Soratto |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |