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Elucidating the effects of forage grass exudates upon soil N cycling and microbiota

Grant number: 18/09622-8
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): September 09, 2018
Effective date (End): December 31, 2018
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:Ciro Antonio Rosolem
Grantee:Camila da Silva Grassmann
Supervisor abroad: Karl Ritz
Home Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
Local de pesquisa : University of Nottingham, Sutton Bonington, England  
Associated to the scholarship:16/25253-7 - Nitrogen dynamics in a cropping system with forages as cover crops and corn, BP.DD


Forage grass species can affect the functioning of the N cycle in the soil, mainly nitrification, and can decrease N availability for the next crop grown in the same area. It has been shown that ruzigrass (Urochloa ruziziensis) can impair the N nutrition of maize plants grown concurrently or subsequently, thought to be via modification of soil N dynamics and the microbiological processes involved. It has been shown that substances exuded by some species of Urochloa inhibit soil biological nitrification under certain circumstances. To elucidate such effects further, root exudates of ruzigrass, palisade grass (Urochloa brizantha) and Guinea grass (Panicum maximum) will be collected and applied to soils in an experimentally controlled manner. Phenotypic and genotypic responses of associated microbial communities will be assessed through PLFA, as well as the impacts of exudates on N mineralization. To determine if such effects are intrinsically affected by the presence of another species, maize and ruzigrass will be grown in novel systems that control the nature and extent of inter-species root-to-root interactions. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
Crop-livestock integration boosts profitability and reduces emissions 
Articles published in other media outlets (1 total):
Science and Technology Research News (EUA): Crop-Livestock Integration Boosts Profitability and Reduces Emissions (15/May/2019)