1 stefania maris

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  • Muestreo desde momento X a 35 días o …
    Muestreo semanal
    Repeticiones
  • 1 stefania maris

    1. 1. Effect of irrigation and fertilization on CH4 and CO2 emissions from paddy soil during the seedling stage in NE Spain Maris, S.C., Teira-Esmatges, M.R., Bosch-Serra A.D., Quílez D., Català Forner M.M. Valencia, 10-11th April 2014 University of Lleida
    2. 2. 1. INTRODUCTION & OBJECTIVES  Increase in rice production involves increase in CH4 and CO2 emissions to the atmosphere  Rice seedling stage significantly contributes to the total CH4 and CO2 emissions from rice paddies in China  How: the different irrigation regimes and different rates of mineral and organic fertilizers affects the CH4 and CO2 emissions during the seedling stage
    3. 3. 2. MATERIAL & METHODS Amposta-1 (2011) CI II Amposta-2 2011 2012 0 kg N ha-1 0 kg N ha-1 150 kg N ha-1 (urea) 150 kg N ha-1 (urea) 170 kg N ha-1 (9.5 t c.m. ha-1 ) 170 kg N ha-1 (15.2 t c.m. ha-1 ) 340 kg N ha-1 (19.1 t c.m. ha-1 ) 340 kg N ha-1 (28.7 t c.m. ha-1 ) Alcolea de Cinca (2012) 0 kg N ha-1 120 kg (NH4)2SO4-N ha-1 120 kg N ha-1 (30 t p.s. ha-1) 170 kg N ha-1 (50 t p.s. ha-1)
    4. 4. CO2 and CH4 Semi-static chamber method 2. MATERIAL & METHODS After closing the chamber and 20 and 40 min later Innova 1312 PAS Multigas Monitor
    5. 5. 3. RESULTS & DISCUSSION Not irrigation type nor soil T affect CH4 emission Amposta-1 Irrigation type CH4 (kg ha-1) CO2 (kg ha-1) % CO2 of the whole crop CI -2.07±0.2a 1167.49±233.08b 23 II -5.29±0.38a 4077.24±310.61a 49 Negative cumulative CH4 emission may be due to soil salinity and to a high soil SO4 -2 content (Datta et al., 2013) II significantly increased CO2 emission
    6. 6. 3. RESULTS & DISCUSSION Year Treatment CH4 (kg ha-1) CO2 (kg ha-1) % CO2 of the whole crop 2011 0 kg N ha-1 -2.37±0.51c 167.67±8.36b 20 150 kg N ha-1 (urea) -0.64±0.04c 418.88±36.18a 39 170 kg N ha-1 (9.5 t ha-1) 9.35±0.24ab 238.71±31.02b 23 340 kg N ha-1 (19.1 t ha-1) 29.62±0.71a 257.11±8.6b 18 2012 0 kg N ha-1 -44.82±7.98c 871.23±158.33a 8 150 kg N ha-1 (urea) -19.91±0.76c 1290.72±253.23a 13 170 kg N ha-1 (15.2 t ha-1) 169.91±31.14a 1257.76±81.24a 25 340 kg N ha-1 (28.7 t ha-1) 48.16±4.66b 1492.35±37.36a 16 Amposta-2 CH4 emission inhibition or oxidation due to soil salinity + high SO4 -2 content 2011: CH4 emission increased with chicken manure appl. 2012: CH4 emission DECREASED; saturation effect (Khalil et al. 1998) Urea emitted ≥ CO2 than chicken manure (Sampanpanish, 2012)
    7. 7. 3. RESULTS & DISCUSSION CH4 emission is lower from pig slurry application than from ammonium sulphate (same N dose) Treatment CH4 (kg ha-1) CO2 (kg ha-1) % CO2 of the whole crop 0 kg N ha-1 60.71±3.47a 122.34±4.96a 2.0 120 kg (NH4)2SO4-N ha-1 73.65±5.61a 114.30±37.78a 1.1 120 kg N ha-1 (30 t p.s.) 39.81±2.33b 190.14±18.87a 2.3 170 kg N ha-1 (50 t p.s.) 65.04±6.77a 197.14±54.87a 2.3 Alcolea de Cinca (2012) CO2 emission is higher with p.s. application
    8. 8. II increases CO2 emissions compared with CI, but has no effect on CH4 emissions Soil salinity + high soil SO4 -2 inhibit CH4 emissions A dose of 30 t chicken manure/ha doesn’t increase CH4 nor CO2 emission CH4 emission is lower from pig slurry application than from ammonium sulphate (same N dose) Pig slurry increases CO2 emission (not significantly) 4. CONCLUSIONS
    9. 9. Thanks for your attention any questions ? University of Lleida Valencia, 10-11th April 2014

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