Evaluating carbon sequestration for conservation agriculture and tillage systems in Cambodia using the EPIC model

Le, Kieu Ngoc; Jha, M. K.; Reyes, Manuel R.; Jeong, Jaehak; Doro, Luca; Gassman, Philip W.; Hok, Lyda; Sá, João Carlos de Moraes; Boulakia, Stéphane

doi:10.1016/j.agee.2017.09.009

Cited by 24 publications

(18 citation statements)

References 59 publications

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“…Crop residue cover for conservation tillage typically ranges from 30% to 60% after harvest (Hively et al., 2018) and crop residue cover in our simulation was 46%. Typical conservation tillage depth ranges from 15 to 20 cm (Le et al., 2018); the simulation presented here uses a 20 cm tillage depth. This approach will yield lower erosion estimates than would occur from conventional tillage and so the results presented in this paper are a conservative estimate of the cumulative erosional loss over the full 100‐year simulation period.…”

Section: Methodsmentioning

confidence: 99%

The Hidden Costs of Land Degradation in US Maize Agriculture

Jang

Neff

et al. 2021

Earth's Future

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The United States is a world leader in the production of maize and other crops and the agricultural success of the country is directly linked to the intensive use of fertilizers and irrigation. However, even in advanced agricultural systems, soils can become degraded over time due to factors such as soil organic matter (SOM) loss and erosion. Here, we use a series of scenario‐based model analyses to show that about one‐third of current annual US. N fertilizer use in maize agriculture is used to compensate for the long‐term loss of soil fertility through erosion and organic matter loss. This leads to over a half billion dollars per year in extra fertilizer supply costs to US farmers. These results highlight the potential to reduce both the input costs and environmental impacts of agriculture through the restoration of SOM in agricultural soils.

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Section: Methodsmentioning

confidence: 99%

The Hidden Costs of Land Degradation in US Maize Agriculture

Jang

Neff

et al. 2021

Earth's Future

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“…The biomass of each individual crop, including cover crops, were satisfactorily replicated with all of the points close to the 1:1 curve [53] and the percent bias (PBIAS) within the 25% limit as suggested by [52], except for cassava (−27%) and maize (−36%) [50,63]. The SOC R 2 of each treatment within each cropping system ranged from 0.65 to 0.99 (p < 0.001) and the percent bias (PBIAS) ≤ 13% [53].…”

Section: Experimental Designmentioning

confidence: 98%

“…The soil properties used as the initial soil input (Table A1) [50,53,63]. The R 2 values ranged from 0.62 to 0.88 for each upland rice, soybean, cassava, and maize yields [63].…”

Section: Experimental Designmentioning

confidence: 99%

“…A top dressing of urea (46% N) and potassium chloride (KCl; 60% K 2 O) was applied to the main crops. The EPIC model is widely used by researchers and government agencies to optimize crop management, maximize crop yield and profit, and identify impacts of agricultural practices on soil erosion, SOC and water quality [38,[51][52][53][54][55][56][57][58][59][60][61][62].…”

Section: Experimental Designmentioning

confidence: 99%

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Evaluation of Long-Term SOC and Crop Productivity within Conservation Systems Using GFDL CM2.1 and EPIC

Jha

Jeong

et al. 2018

Sustainability

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Abstract:Will soil organic carbon (SOC) and yields increase for conservation management systems in tropical zones in response to the next 100 years? To answer the question, the Environmental Policy Integrated Climate (EPIC) model was used to study the effects of climate change, cropping systems, conservation agriculture (CA) and conservation tillage management practices on SOC and crop productivity in Kampong Cham, Cambodia. The EPIC model was successfully calibrated and validated for crop yields, biomass, SOC and nitrogen based on field data from a five-year field experiment. Historical weather (1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013) was used for baseline assessment versus mid-century (2046-2064) and late-century (2081-2100) climate projections generated by the Geophysical Fluids Dynamics Laboratory (GFDL) CM2.1 global climate model. The simulated results showed that upland rice yield would increase the most under the B1 scenario in mid-century for all treatments, followed by soybean and maize. Cassava yield only increased under CA treatment when cultivated as a continuous primary crop. Carbon sequestration was more sensitive to cropping systems and crop rotation than climate change. The results indicated that the rotated CA primary crop (maize) systems should be prioritized for SOC sequestration as well as for increasing crop productivity. In addition, rice systems may increase SOC compared to soybean and cassava.

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“…Conservation agriculture was a new agricultural system and technology system based on the sustainable development of agriculture. Its main objective was to achieve economically and ecologically sustainable agricultural production through the integrated management of available land, water, and biological resources [64]. Conservation agriculture cut off the connection between the evaporative surface and the soil capillary, effectively restraining soil evaporation and improving water availability [64,65].…”

Section: Conservation Agriculture Has a Positive Effect On Soil Desiccation Restorationmentioning

confidence: 99%

Conservation Agriculture Could Improve the Soil Dry Layer Caused by the Farmland Abandonment to Forest and Grassland in the Chinese Loess Plateau Based on EPIC Model

Guo

Wang

2021

Forests

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Converting farmland to forest and grassland alleviated water loss and soil erosion. However, water-intensive grasslands and woodlands could form dry soil layers in the arid or semi-arid zones. Therefore, it is necessary to explore a management method to solve this pedological problem. In this study, based on the Environment Policy Integrated Climate (EPIC) model, the crop productivity and soil dry layer was predicted from 2018 to 2038 in alfalfa and apple land. Then, conservation agriculture and conventional tillage systems were used to repair the soil dry layer in apple and alfalfa systems from 2039–2050 in order to explore their potential. Model verification showed that EPIC simulations of yield, ET, and SWC were generally reliable. The predicted results showed that soil drought was more intense in alfalfa systems. Alfalfa’s annual decrease rate and total amount in the soil available water (SAW) were 27.31 mm year−1 and 652.76 mm, higher than 13.62 mm year−1 and 476 mm of the apple system, and the DSLT of apple’s system was thicker, but DSL-SWC was higher than alfalfa. In the recovery process, the restoration degree of soil desiccation in conservation agriculture was significantly higher than in conventional tillage systems (p < 0.05). In addition, the recovery effect increased with the increase of planting times of shallow root crops, such as potato and soybean. The recovery rate was 27.1 ± 1.72 mm year−1, DSLT was 750 ± 51.2 cm in conventional tillage systems, and the recovery rate was 44.7 ± 1.99 mm year−1, DSLT was 258.3 ± 74.9 cm in conservation agriculture systems. This study provides an effective farmland management method to alleviate soil desiccation and further reveals the new role of the Epic Model in future drought assessment.

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Evaluating carbon sequestration for conservation agriculture and tillage systems in Cambodia using the EPIC model

Cited by 24 publications

References 59 publications

The Hidden Costs of Land Degradation in US Maize Agriculture

The Hidden Costs of Land Degradation in US Maize Agriculture

Evaluation of Long-Term SOC and Crop Productivity within Conservation Systems Using GFDL CM2.1 and EPIC

Conservation Agriculture Could Improve the Soil Dry Layer Caused by the Farmland Abandonment to Forest and Grassland in the Chinese Loess Plateau Based on EPIC Model

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