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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 2014University of
Lleida
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
2. MATERIAL & METHODSAmposta-1 (2011)
CIII
Amposta-22011 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)
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
3. RESULTS & DISCUSSION
Not irrigation type nor soil T affect CH4 emission
Amposta-1Irrigation 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
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 20150 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 23340 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 8150 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 25340 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)
3. RESULTS & DISCUSSION
CH4 emission is lower from pig slurry application than from ammonium sulphate (same N dose)
TreatmentCH4
(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 1.1120 kg N ha-1 (30 t p.s.) 39.81±2.33b 190.14±18.87a 2.3170 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
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
Thanks for your attention
any questions ?
University of Lleida
Valencia, 10-11th April 2014