02633nam a2200205 a 450000100080000000500110000800800410001910000290006024501070008926001680019652018880036465000150225265300210226765300450228870000180233370000240235170000170237570000170239270000180240919330612023-12-18       2012    bl uuuu     u00u1 u    #d1 aANDRADE JUNIOR, A. S. de  aAgricultural water footprint of ethanol and sugar from sugar cane under fertigation production system.  aIn: INTERNATIONAL CONFERENCE OF AGRICULTURAL ENGINEERING, 2012, Valencia. Agriculture & engineering for a healthier life: abstracts. Valencia: CIGR: EurAgEngc2012  aThe  study  has  objective  to  calculate  the  green,  blue  and  grey  agricultural  water  footprint (WF)  of  ethanol  and  sugar  produced  from  sugar  cane,  under  subsurface  fertigation  production system,  in Piauí State, Brazil. Sugar and ethanol production data  in response  to different irrigation levels (288, 492 and 675 mm), nitrogen fertigation (90, 113 and 160 kg ha-1 N ) and potassium (60 and 133 kg ha-1 of K2O) plus a control treatment (2,080 mm of rainfall, 75 kg N ha-1  and 75 kg ha-1  of K2O) were obtained from a trial under subsurface drip irrigation system,  RB  867515  sugar  cane  variety,  1st   ratoon,  conducted  in  COMVAP  -  Sugar  and Alcohol  Inc.,  União  county,  Piauí  State,  Brazil.  Under  subsurface  drip  fertigation,  the agricultural WF  for sugar production  ranged  from 1,493 L kg-1   (1,175 L kg-1 - green water, 163 L kg-1 - blue water and 155 L kg-1 - grey water) to 1,172 L kg-1  (823 L kg-1 - green water, 267 L kg-1   - blue water and 83 L kg-1  - gray water). For ethanol production,  the agricultural WF ranged from 2,081 L L-1  (1,638 L L-1 - green water, 227 L L-1  - blue water and 216 L L-1  - grey water)  to 1,483 L L-1  (1,040 L L-1 - green water, 338 L L-1  - blue water and 105 L L-1 - grey  water).  Under  non-irrigated  condition,  the  agricultural WF  for  sugar  production  was 1,915 L kg-1  (1,763 L kg-1 - green water and 152 L kg-1  - grey water) and 2,658 L L-1 (2,448 L L-1 - water green and 211 L L-1  - grey water) for ethanol production. The agricultural WF for the ethanol production was  superior  to  sugar production. Agricultural water  footprint under fertigation  was  lower  than  that  obtained  under  non-irrigated  condition,  and  should  be  a recommended practice for increasing water productivity to sugar and ethanol production from sugar cane crop in the region evaluated.  aBioenergia  aDemanda de água  aIrrigação por gotejamento subterrâneo1 aBASTOS, E. A.1 aAGUIAR NETTO, A. O.1 aBRAGA, D. L.1 aSILVA, M. E.1 aNOLETO, D. H.