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Root extracts of Bracchiaria humidicola andSaccharum spontaneum to increase N use by sugarcane
Kõlln, Oriel Tiago; Franco, Henrique Coutinho Junqueira; Ferreira, Danilo Alves; Vargas, Vitor Paulo; Castro, Saulo Augusto de Quassi; Cantarella, Heitor; Caldana, Camila; Trivelin, Paulo Cesar Ocheuze.
Afiliação
  • Kõlln, Oriel Tiago; Brazilian Bioethanol Science and Technology Laboratory. National Centre for Research in Energy and Materials. Campinas. BR
  • Franco, Henrique Coutinho Junqueira; Brazilian Bioethanol Science and Technology Laboratory. National Centre for Research in Energy and Materials. Campinas. BR
  • Ferreira, Danilo Alves; Brazilian Bioethanol Science and Technology Laboratory. National Centre for Research in Energy and Materials. Campinas. BR
  • Vargas, Vitor Paulo; Agronomic Institute of Campinas. Soil and Environmental Resources Center. Campinas. BR
  • Castro, Saulo Augusto de Quassi; University of São Paulo. ESALQ. Dept of Soil Science. Piracicaba. BR
  • Cantarella, Heitor; Agronomic Institute of Campinas. Soil and Environmental Resources Center. Campinas. BR
  • Caldana, Camila; Brazilian Bioethanol Science and Technology Laboratory. National Centre for Research in Energy and Materials. Campinas. BR
  • Trivelin, Paulo Cesar Ocheuze; Center for Nuclear Energy in Agriculture. Dept of Stable Isotopes. Piracicaba. BR
Sci. agric ; 73(1): 34-42, Jan.-Feb.2016. tab, graf
Article em En | VETINDEX | ID: biblio-1497538
Biblioteca responsável: BR68.1
Localização: BR68.1
ABSTRACT
Retaining the mineral N in the form of NH4+ in the soil for a lengthy period is desirable for reducing losses. Furthermore, there is evidence that sugarcane prefers NH4+-N in place of NO3-N. This study aimed firstly, to evaluate the potential of root extracts of Bracchiaria humidicola andSaccharum spontaneum, in contrast with the DCD (Dicyandiamide) inhibitor, to increase absorption of N by plants fertilized with ammonium sulfate, and secondly, to quantify the emission of N2O fluxes with the use of this inhibitor. The experiment was developed in a glasshouse in an entirely randomized design where four treatments were applied AS) ammonium sulfate (control); AS+DCD) ammonium sulfate associated with dicyandiamide; AS+BCH) ammonium sulfate associated with root extracts ofBrachiaria humidicola; and AS+SCS) ammonium sulfate associated with root extracts of Saccharum spontaneum. Differences were observed in biomass production in plants 45 and 60 days after fertilization (DAF) and 15 and 60 days in biomass accumulation of roots. The application of AS associated with DCD synthetic inhibitor kept NO3-N values low throughout the evaluation period, while in other treatments the concentration increased right up to the second evaluation 15 DAF. Sugarcane plants did not benefit from the increased presence of ammoniacal N promoted by DCD. The use of DCD reduced the average flux of N2O during the evaluation period compared to plants receiving AS treatments only, which was not observed when root extracts of B. humidicola and S. spontaneum were used.
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