Nutrient Partitioning and Stoichiometry in Unburnt Sugarcane Ratoon at Varying Yield Levels

Autor(es)

Leite, Jose M. ^[1] ; Ciampitti, Ignacio A. ^[2] ; Mariano, Eduardo ^[3] ; Vieira-Megda, Michele X. ^[4] ; Trivelin, Paulo C. O. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Soil Sci, Piracicaba - Brazil

^[2] Kansas State Univ, Dept Agron, Manhattan, KS 66506 - USA

^[3] Univ Sao Paulo, Lab Stable Isotopes, Piracicaba - Brazil

^[4] Univ Estadual Montes Claros, Dept Agr, Janauba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN PLANT SCIENCE; v. 7, APR 20 2016.
• Citações Web of Science: 10

Resumo

Unraveling nutrient imbalances in contemporary agriculture is a research priority to improve whenever possible yield and nutrient use efficiency in sugarcane (Saccharum spp.) systems while minimizing the costs of cultivation (e.g., use of fertilizers) and environmental concerns. The main goal of this study was therefore to investigate biomass and nutrient {[}nitrogen (N), phosphorus (P), and potassium (K)] content, partitioning, stoichiometry and internal efficiencies in sugarcane ratoon at varying yield levels. Three sites were established on highly weathered tropical soils located in the Southeast region of Brazil. At all sites, seasonal biomass and nutrient uptake patterns were synthesized from four sampling times taken throughout the sugarcane ratoon season. In-season nutrient partitioning (in diverse plant components), internal efficiencies (yield to nutrient content ratio) and nutrient ratios (N:P and N:K) were determined at harvesting. Sugarcane exhibited three distinct phases of plant growth, as follows: lag, exponential linear, and stationary. Across sites, nutrient requirement per unit of yield was 1.4 kg N. 0.24 kg P, and 2.7 kg K per Mg of stalk produced, but nutrient removal varied with soil nutrient status (based on soil plus fertilizer nutrient supply) and crop demand (potential yield). Dry leaves had lower nutrient content (N, P, and K) and broader N:P and N:K ratios when compared with tops and stalks plant fractions. Greater sugarcane yield and narrowed N:P ratio (6:1) were verified for tops of sugarcane when increasing both N and P content. High-yielding sugarcane systems were related to higher nutrient content and more balanced N:P (6:1) and N:K (0.5:1) ratios. (AU)

• Processo FAPESP: 09/04691-2 - Mineralização e disponibilidade de nitrogênio em solos cultivados com cana-de-açúcar
• Beneficiário: Eduardo Mariano
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 09/10192-9 - Eficiência agronômica de fontes nitrogenadas aplicadas em soqueira de cana-de-açúcar colhida mecanicamente
• Beneficiário: Michele Xavier Vieira Megda
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/21532-5 - Eficiência agronômica da adubação nitrogenada associada à aplicação de ácido húmico em cana-de-açúcar
• Beneficiário: José Marcos Leite
• Modalidade de apoio: Bolsas no Brasil - Doutorado