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#soilorganiccarbon

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Public
Tomislav Hengl

#SoilOrganicCarbon (organic matter / plant and animal residues at various stages of decomposition) is one of the key indicators of hashtag#soilhealth / soil ecosystem services. But how do you measure and report SOC? We advocate that SOC density [kg/m3] is the central variable to monitor SOC dynamics. It is derived by measuring SOC content and Bulk density (separately) and then by a simple formula:

SOC [kg/m3] = SOC [dg/kg]/100 * BD [kg/m3] * (1-CF)

*CF is the coarse fragments fraction (0-1).

Public
Senator Paula Simons🇨🇦

On NYE, as I look back at 2024, I want to share three Senate reports, of which I am quite proud. The first is Critical Ground, the major two-year study carried out by the Standing Senate Committee on Agriculture and Forestry - a comprehensive look at soil health in Canada & a call to action to protect our farm soil & native grasslands, not just for food production, but for climate change mitigation. sencanada.ca/en/info-page/parl #SenateofCanada #soil #soilhealth #climatechange #soilorganiccarbon

SenCanadaCritical Ground: Why Soil is Essential to Canada's Economic, Environmental, Human, and Social HealthThe report digs deep into the critical role of soil in mitigating climate change, contributing to biodiversity and putting food on tables.
Public
OpenGeoHub Foundation

🌱 Registrations for the Soil Health Now! Conference are now open! 🌱 2025.ai4soilhealth.eu/#submit

🌲From April 8-10, 2025, we will be hosting the Soil Health Now conference, alongside workshops and discussion forums at the Wageningen International Conference Center (WICC). 🌿 The event will feature 12+ pan-European "Mission Soil" projects and 11+ distinguished keynote speakers.
🟠 #EO Data for Monitoring #SoilHealth
🟠 #SoilOrganicCarbon (SOC)
🟠 Tech/Tools demonstrations
🟠 Soil Health Indicators

2025.ai4soilhealth.euSoil Health Now - European Conference 8–10 April 2025, Wageningen International Conference Center (WICC), WageningenA 3-day international conference with keynotes, discussion forums, oral talks, workshops and demonstrations + fieldwork
Public
Rémi Cardinael

#JustOut Congrat Vira Leng for this 1st PhD #openaccess paper in the EGU SOIL journal 👏! A nice study on 13-year-old trials in 🇰🇭 with cassava, maize🌽or soybean #conservationagriculture #soilorganiccarbon #soilfractions #MAOM #POM

soil.copernicus.org/articles/1

soil.copernicus.orgDiachronic assessment of soil organic C and N dynamics under long-term no-till cropping systems in the tropical upland of CambodiaAbstract. No-till (NT) cropping systems have been proposed as a strategy to combat soil degradation by storing soil organic carbon (SOC) and total nitrogen (TN). We quantified the impacts of NT cropping systems on the changes in SOC and TN stocks and in particulate and mineral-associated organic matter fractions (POM and MAOM), to 100 cm depth, from three 13-year-old experiments in a tropical red Oxisol in Cambodia using diachronic and equivalent soil mass approaches. Established in 2009 and arranged in a randomized complete-block design with triplicates, the experiments included maize (MaiEx)-, soybean (SoyEx)-, and cassava (CasEx)-based cropping systems. Each experiment comprised three treatments: (1) mono-cropping of main crops (maize, soybean, and cassava) under conventional tillage (CTM); (2) mono-cropping of main crops under NT systems with the use of cover crops (NTM); and (3) bi-annual rotation of main crops under NT systems with the use of cover crops (NTR), with both crops being presented every year and represented by NTR1 and NTR2. Soil samples were collected in 2021, 10 years after the last sampling. All the NT systems significantly (p<0.05) increased SOC stock in the topsoil in SoyEx and MaiEx and down to 40 cm in CasEx. Considering the whole profile (0–100 cm), the SOC accumulation rates ranged from 0.86 to 1.47 and from 0.70 to 1.07 Mg C ha−1 yr−1 in MaiEx and CasEx, respectively. Although SOC stock significantly increased in CTM at 0–20 cm in MaiEx and CasEx, it remained stable at 0–100 cm in all the experiments. At 0–5 cm, NTR systems significantly increased TN stock in all the experiments, while, in NTM systems, it was only significant in MaiEx and SoyEx. At 0–100 cm, TN stock in all the experiments remained stable under NTR systems, whereas a significant decrease was observed under NTM systems in SoyEx and CasEx. Although C-POM stock significantly increased under all NT systems limited to 0–10 cm in MaiEx and SoyEx, all the NT systems significantly increased C-MAOM stock in the 0–10 cm layer in MaiEx and SoyEx and down to 40 cm in CasEx. All the NT systems significantly increased N-POM stock at 0–10 cm in MaiEx and SoyEx, while a significant decreased in N-MAOM stock was observed below 5 cm in CasEx and below 40 cm in MaiEx and SoyEx. Our findings showed that long-term NT systems with crop species diversification accumulated SOC not only on the surface but also in the whole profile by increasing SOC in both the POM and MAOM, even in the cassava-based system. This study highlights the potential of NT systems for storing SOC over time but raises questions about soil N dynamics.
Public
Kathe Todd-Brown

Spatial co-variation matters when upscaling environmental samples like soil organic carbon stocks. Geostatistics is under-utilized in most regional estimats. Strong spatial autocorrelation preserves uncertainty in upscaled estimates. By not taking this into account, may estimates report uncertainties that are too small. Properly taking this into account requires large sample sizes. Wadoux and Heuvelink 2023 doi.org/10.1111/2041-210X.1410

#Geostatistics#SoilOrganicCarbon#Upscaling
Public
Doug Bostrom

To a bystander it looks like brutal treatement yet it's only SOP in science. And the reply is a fun bit of cut-and-thrust concluding with a polite (barbed?) thank-you:

"...we thank Kästner et al. (2024) for raising questions to highlight the most important statements in our review..."

But more importantly, at this juncture it seems we'd best figure this out once and for all, global carbon sink/source/flux/budget being all-inclusive?

#SOC
#SoilOrganicCarbon

onlinelibrary.wiley.com/doi/10

Public
Rémi Cardinael

#JustOut #openaccess
Mulch application as the overarching factor explaining increase in #soilorganiccarbon stocks under #conservationagriculture in two 8-year-old experiments in Zimbabwe

soil.copernicus.org/articles/1

soil.copernicus.orgMulch application as the overarching factor explaining increase in soil organic carbon stocks under conservation agriculture in two 8-year-old experiments in ZimbabweAbstract. Conservation agriculture (CA), combining reduced or no tillage, permanent soil cover, and improved rotations, is often promoted as a climate-smart practice. However, our understanding of the impact of CA and its respective three principles on top- and subsoil organic carbon stocks in the low-input cropping systems of sub-Saharan Africa is rather limited. This study was conducted at two long-term experimental sites established in Zimbabwe in 2013. The soil types were abruptic Lixisols at Domboshava Training Centre (DTC) and xanthic Ferralsol at the University of Zimbabwe farm (UZF). The following six treatments, which were replicated four times, were investigated: conventional tillage (CT), conventional tillage with rotation (CTR), no tillage (NT), no tillage with mulch (NTM), no tillage with rotation (NTR), and no tillage with mulch and rotation (NTMR). Maize (Zea mays L.) was the main crop, and treatments with rotation included cowpea (Vigna unguiculata L. Walp.). The soil organic carbon (SOC) concentration and soil bulk density were determined for samples taken from depths of 0–5, 5–10, 10–15, 15–20, 20–30, 30–40, 40–50, 50–75 and 75–100 cm. Cumulative organic inputs to the soil were also estimated for all treatments. SOC stocks at equivalent soil mass were significantly (p<0.05) higher in the NTM, NTR and NTMR treatments compared with the NT and CT treatments in the top 5 cm and top 10 cm layers at UZF, while SOC stocks were only significantly higher in the NTM and NTMR treatments compared with the NT and CT treatments in the top 5 cm at DTC. NT alone had a slightly negative impact on the top SOC stocks. Cumulative SOC stocks were not significantly different between treatments when considering the whole 100 cm soil profile. Our results show the overarching role of crop residue mulching in CA cropping systems with respect to enhancing SOC stocks but also that this effect is limited to the topsoil. The highest cumulative organic carbon inputs to the soil were observed in NTM treatments at the two sites, and this could probably explain the positive effect on SOC stocks. Moreover, our results show that the combination of at least two CA principles including mulch is required to increase SOC stocks in these low-nitrogen-input cropping systems.
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