Seasonal and annual methane and nitrous oxide emissions affected by tillage and cover crops in flood-irrigated rice

Grohs, Mara; Giacomini, Sandro José; da Rosa, Caren Alessandra; Neu, Giovane Rodrigo Friedrich; Dorneles, Alicia Baumhardt; Lüdtke, Fernanda Luisa; Mc Mannis, Guilherme Silveira

doi:10.1016/j.agee.2023.108747

Cited by 3 publications

(2 citation statements)

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“…Irrigation systems that include soil drainage, intermittency of irrigation, reduction in the irrigation period or even the reduction/elimination of the irrigation depth provide, as a rule, a reduction in CH 4 emissions from the soil(Cowan et al, 2021), in relation to continuous ooding, the same applies to the furrow irrigation system. Regardless of the portion of the furrow considered, total CH 4 emissions measured in ridge-furrow system were lower than those determined in ood irrigated rice crops established in the same soil and cultivation region(Bayer et al, 2015;Grohs et al, 2024;Veçozzi et al, 2021), which normally vary between 300 and 400 kg ha − 1 , reinforcing the CH 4 emission mitigating potential of the ridge-furrow system.In the three portions, CH 4 accounted for the vast majority of pGWP (81 to 98%) associated with rice cultivation. According toLinquist et al (2012) the pGWP emitted in irrigated rice production systems consists mainly of CH 4 , which normally accounts for between 85% and 99% of the total emissions.…”

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confidence: 78%

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New ridge–furrow irrigation system reduces methane emissions and partial global warming potential in rice cultivation

Timm,

Scivittaro,

Parfitt

et al. 2024

Preprint

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Flood irrigated rice, in addition to using large volumes of water, is one of the main causes (~30%) of methane (CH4) emissions from agriculture. New cultivation technologies in lowlands, such as ridge-furrow, enable the use of a smaller volume of water in rice cultivation compared to traditional flood irrigation and higher soil oxidation, which can impact the emission of CH4 and nitrous oxide (N2O). The expansion of the use of the ridge-furrow system in southern Brazil occurs because it has been one of the systems responsible for the expansion of alternative crops, such as soybean and corn in rotation with rice. The ridge-furrow promotes adequate drainage of the soil surface and irrigation of crops, minimizing damage from excess and deficit water in lowlands. Thus, the objective of the work was to evaluate the emission of CH4, N2O, partial global warming potential (pGWP) and rice grain yield in a ridge-furrow system in rotation with soybean. The trial was carried under field conditions at the Ricetec Experimental Station, in the 2020/21 and 2021/22 crop seasons in Capão do Leão, Southern Brazil, taking advantage of the infrastructure of ridge-furrow established for soybean in rotation in the previous season. Was used an XP117 RiceTec rice hybrid with a 130-day cycle. The treatments consisted of different portions of the furrow: upper (wet soil); intermediate (saturated soil) and bottom portion (flooded soil). Rice cultivation in the ridge-furrow system reduced CH4 emissions by 34% and partial global warming potential by 30%. Rice grain yield levels remained high in the ridge-furrow system. Thus, the ridge-furrow irrigation contributes to increasing the sustainability of rice production as it enables a significant reduction in CH4 emissions and a more efficient in the use of water.

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confidence: 78%

“…In the 2021/22 crop season, the pGWP was higher in the bottom portion (19,122 kg CO 2 equiv. ha − 1 ), reducing in the intermediate portion (14,481 kg CO 2 equiv. ha − 1 ) and the lower in the upper portion (8,979 kg CO 2 equiv.…”

Section: Partial Global Warming Potential (Pgwp)mentioning

confidence: 99%