Produção Nacional
The Role of Nitrogen Fertilizers in Sugarcane Root Biomass under Field Conditions
2014; Scientific Research Publishing; Volume: 05; Issue: 14 Linguagem: Inglês
10.4236/as.2014.514164
ISSN2156-8561
AutoresRafael Otto, Henrique Coutinho Junqueira Franco, Carlos Eduardo Faroni, André Cesar Vitti, Emídio Cantídio Almeida de Oliveira, Renata Alcarde Sermarini, Paulo César Ocheuze Trivelin,
Tópico(s)Growth and nutrition in plants
ResumoSugarcane is used worldwide for sugar, ethanol and energy production. In Brazil, the shift from burned to unburned harvest systems resulted in increases in nitrogen fertilization rates, which can impact root architecture and biomass. The expectation is also an increase in sugarcane biomass. The study hypothesized that high N rates applied to sugarcane fields increases root growth and N stored in roots, promoting higher biomass and N accumulated in shoots. Two experiments were set up in Southeastern Brazil, on a Typic Kandiudox (TK) and Rhodic Eutrudox (RE). Four treatments were studied 1) N application in the plant-cane (0 and 120 kg·ha-1 N) and 2) N application in the ratoon (0 and 150 kg·ha-1 N). The shoot biomass and the root density (by the core method up to 0.6 m) were evaluated over the first ratoon crop cycle, and the N content in those compartments was also examined. There was no carry over effect on N applied at planting in root and shoot biomass in the ratoon crop cycle. At the RE site, the ratoon N fertilization increased root density in the superficial soil layer (0 - 0.2 m) and close to the plants (
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