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The Role of Nitrogen Fertilizers in Sugarcane Root Biomass under Field Conditions

Agricultural Sciences 2014年第14期5卷 1527-1538页

作者： Rafael Otto Henrique Coutinho Junqueira Franco Carlos Eduardo Faroni André Cesar Vitti emídio cantidio almeida de oliveira Renata Alcarde Sermarini Paulo Cesar Ocheuze Trivelin department of Soil Science Luiz de Queiroz College of Agriculture University of Sao Paulo Piracicaba Brazil Brazilian Bioethanol Science and Technology Laboratory (CTBE) Rua Giuseppe Maximo Scolfaro Campinas Brazil Sugarcane Research Center (CTC) Piracicaba Brazil Sao Paulo Agency of Agribusiness and Technology (APTA) Piracicaba Brazil Federal Rural University of Pernambuco (UFRPE) Recife Brazil department of Exact Sciences Luiz de Queiroz College of Agriculture University of Sao Paulo Piracicaba Brazil Center for Nuclear Energy in Agriculture University of Sao Paulo Piracicaba Brazil

Sugarcane 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 (der Brazilian field conditions.

关键词： Root System Ratoon Shoot Root: Shoot Ratio

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