Continuous milk vetch amendment in rice-fallow rotation improves soil fertility and maintains rice yield without increasing CH4 emissions: Evidence from a long-term experiment

Hou, Pengfu; Xue, Lian; Wang, Jing; Petropoulos, Evangelos; Deng, Xuzhe; Qiao, Jun; Xue, Lihong; Yang, Linzhang

doi:10.1016/j.agee.2021.107774

Cited by 22 publications

(12 citation statements)

References 35 publications

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“…Here we also found that green manure stimulated the copies of both mcrA and pmoA genes as well as mcrA/pmoA. Researchers have proved that methanogens play a vital role in methane emissions from paddy fields subjected to green manure amendment [12,34]. Fortunately, the methane emissions in the two green manure amendment fields did not significantly increase when compared with the fallow control.…”

Section: Ch 4 Emissionssupporting

confidence: 52%

“…Specifically, ryegrass/rape amendment increases the CH 4 emissions from paddies compared to the fallow control; however, milk vetch amendment can decrease methane emissions. Hou et al (2022) also found that ryegrass (high C/N) amendment promoted paddy methane emissions compared to fallow control due to the higher copies of mcrA gene and SOC content, while milk vetch (low C/N) emitted equivalent CH 4 emissions with the control [12]. These observations suggest that the C/N ratio of green manure, other than soil physicochemical properties and microorganisms, plays a decisive role in methane formation and emissions from paddies.…”

Section: Introductionmentioning

confidence: 98%

“…Rice is one of the most important cereals for maintaining global food security; however, its often-anaerobic growth conditions render rice agro-ecosystems a powerful source of CH 4 emissions [9,10]. Green manure amendment is recognized as an effective measure for soil Agronomy 2022, 12, 1548 2 of 12 fertility improvement in paddy-upland rotation, especially for SOC [11,12]. More importantly, such amendments can affect crop yields and GHG emissions.…”

Section: Introductionmentioning

confidence: 99%

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Green Manure Amendment in Paddies Improves Soil Carbon Sequestration but Cannot Substitute the Critical Role of N Fertilizer in Rice Production

et al. 2022

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Clarifying the benefits of carbon sequestration and crop production of continuous green manure amendment is crucial for sustainable agricultural development. Here, using a long-term located experiment, we assessed the effects of 18 years’ ryegrass/milk vetch amendment with (NF, 150 kg N ha−1) or without nitrogen (N) fertilizer input (CK), on soil carbon management indices, paddy methane (CH4) emissions and rice yields. The results showed that green manure, rather than fertilization, played a critical role in soil CMI, increasing the carbon pool index but reducing the carbon management index. The increased soil organic carbon and the reduced labile organic carbon were the main causes for this performance. Additionally, the effects of both fertilization and green manure amendment on CH4 emissions were insignificant; however, fertilization significantly increased grain yield by 39.30% compared to CK. As a result, the methane emission intensity under fertilization treatment was notably lower than that from CK. The findings suggest that green manure amendment is a profitable manipulation for enhancing carbon sequestration without increasing paddy CH4 emissions. However, this cannot substitute the critical role of N fertilizer in rice production.

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Section: Ch 4 Emissionssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Green Manure Amendment in Paddies Improves Soil Carbon Sequestration but Cannot Substitute the Critical Role of N Fertilizer in Rice Production

et al. 2022

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“…These results supported the bene cial effect of replacing chemical N with green manure on N 2 O mitigation. To trace N 2 O production from different N sources in a paddy ecosystem, 15 N labeled green manure or chemical fertilizer should be used in further studies.…”

Section: And N Release From Rg Residuementioning

confidence: 99%

“…The rapidly rising soil NH 4 + -N and NO 3 − -N concentrations after chemical N fertilizer application bene t nitri cation and denitri cation, and increase the potential of N loss in the form of N The ratio of substitution of organic for chemical fertilizer is an important factor for determining C and N dynamics after fertilization (Lashermes et al 2010) as well as the consequent changes in soil environment (Hou et al 2022). In addition, the complex interaction between organic material and inorganic N under different organic-chemical N substitution ratio greatly affects CH 4 and N 2 O emissions (Zou et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Does replacing chemical fertilizer with ryegrass (Lolium multiflorum Lam.) mitigate CH4 and N2O emissions and reduce global warming potential from paddy soil?

Yang

Yao

et al. 2022

Plant Soil

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The incorporation of ryegrass (Lolium multi orum Lam.; RG), a winter grass manure, could partly replace chemical N and reduce N loss during the succeeding rice seasons, but little is known about its impact on greenhouse gas emission. This study investigated the effect of different RG-urea substitution ratios (0%, 25%, 50%, 75% and 100%) on C and N release, CH 4 and N 2 O emissions in a paddy soil.(Methods) Gas samples for CH 4 and N 2 O uxes measurement were collected by using a closed chamber and determined by chromatograph method. C and N release from the incorporated RG residue were tested by a mesh bag method.(Results) C and N release from RG followed a single exponential decay model, with 95.5%-97.8% of the original C and 98.7%-99.3% of N released during 192 days. RG-urea substitution ratio increased CH 4 emission, but was negatively correlated with N 2 O emission. In comparison with 0% substitution, global warming potential (GWP) and greenhouse gas intensity (GHGI) were not signi cantly different for the 25% and 50% RG substitutions, but were signi cantly higher for the 75% and 100% substitutions (P<0.05). Soil redox, C and N remaining in litter residue were key characteristics explaining CH 4 emission, while NH 4 + -N and NO 3 --N concentrations were correlated with the variation of N 2 O emission. (Conclusion)The increased CH 4 emission by RG incorporation could be offset by the reduced N 2 O emission when RGurea substitution ratio was 50% or less.

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Cover crops in organic cotton influence greenhouse gas emissions and soil microclimate

Salehin,

Rajan,

Mowrer

et al. 2024

Agronomy Journal

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Cover crops in organic cotton systems can offset the carbon loss typically observed in conventional systems. However, their effects on greenhouse gas (GHG) emissions and soil microclimate are poorly understood. Our objective was to investigate the effects of cover crops on soil carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4) emissions and soil moisture and temperature dynamics in organic cotton systems. To achieve this, we used static chamber techniques with soil sensors in a field study near College Station, TX, from 2020 to 2022. Cover crops tested were oat (Avena sativa L.), Austrian winter pea (Pisum sativum L.) (AWP), turnip (Brassica rapa subsp. rapa), a mixture of all three, and a fallow control. In the first year of organic transition (2020), mixed species treatment enhanced CO2 emission by 39.6%, 34.4%, and 40% than AWP, turnip, and control, respectively. Compared to the control, N2O emissions were lower in AWP, turnip, and oat treatments by 77%, 57.2%, and 53% in 2020. Weed pressure and drought in 2021 and 2022 neutralized cover crops’ effect on soil GHG emissions. Soils generally acted as net CH4 sinks, but the uptake did not differ among the treatments. Cover crops depleted soil moisture during their growing period, but surface residues helped retain more moisture during the cotton season. Compared to fallow, mixed species and AWP were observed to reduce soil temperature fluctuations. Therefore, in transitioning, organic systems effects of cover crops on soil GHG emissions can vary depending on weather, weed management, and the cover crop types.

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Continuous milk vetch amendment in rice-fallow rotation improves soil fertility and maintains rice yield without increasing CH4 emissions: Evidence from a long-term experiment

Cited by 22 publications

References 35 publications

Green Manure Amendment in Paddies Improves Soil Carbon Sequestration but Cannot Substitute the Critical Role of N Fertilizer in Rice Production

Green Manure Amendment in Paddies Improves Soil Carbon Sequestration but Cannot Substitute the Critical Role of N Fertilizer in Rice Production

Does replacing chemical fertilizer with ryegrass (Lolium multiflorum Lam.) mitigate CH4 and N2O emissions and reduce global warming potential from paddy soil?

Cover crops in organic cotton influence greenhouse gas emissions and soil microclimate

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