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Effect of irrigation and fertilization on CH 4 and CO 2 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, 10-11 th April 2014 University of Lleida

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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

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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

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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)

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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

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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

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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)

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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

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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

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Thanks for your attention

any questions ?

University of Lleida

Valencia, 10-11th April 2014