Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Leite, Jose M. [1] ; Ciampitti, Ignacio A. [2] ; Mariano, Eduardo [3] ; Vieira-Megda, Michele X. [4] ; Trivelin, Paulo C. O. [3]
Número total de Autores: 5
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
Número total de Afiliações: 4
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: 11/21532-5 - Eficiência agronômica da adubação nitrogenada associada à aplicação de ácido húmico em cana-de-açúcar
Beneficiário:José Marcos Leite
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 09/04691-2 - Mineralização e disponibilidade de nitrogênio em solos cultivados com cana-de-açúcar
Beneficiário:Eduardo Mariano
Linha de fomento: 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
Linha de fomento: Bolsas no Brasil - Doutorado