Soil carbon change across ten New South Wales farms under different farm management regimes in Australia

Singh, Kanika; Whelan, Brett

doi:10.1111/sum.12590

Cited by 13 publications

(9 citation statements)

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“…Soil represents the largest terrestrial carbon pool (Le Quere et al., 2018). Soil carbon storage is affected by farm management strategies (Chowaniak et al., 2020; Govindasamy et al., 2020; Singh & Whelan, 2020) and soil microbial processes can also result in the emission of N 2 O (Davidson, 2009; Hu et al., 2020; Wang et al., 2020), a greenhouse gas with 298 times the atmospheric heat‐trapping ability of CO 2 (IPCC, 2014). Biochar application increases soil organic content in soil, resulting in carbon sequestration (Zhao, Lin, et al, 2020).…”

Section: Biochar For Climate Change Mitigationmentioning

confidence: 99%

Biochar for sustainable soil management

Hou

2021

Soil Use and Management

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Section: Biochar For Climate Change Mitigationmentioning

confidence: 99%

Biochar for sustainable soil management

Hou

2021

Soil Use and Management

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“…This constraint would be present in many regional waste treatment facilities in Australia. Carbon sequestration in soils is made more problematic in this (Singh & Whelan, 2020) and other similar (Maia et al, 2019) regions because the dry semi‐arid climate and more recently, extended droughts and above‐average temperatures (Bange et al, 2016) contribute to accelerated losses of SOC.…”

Section: Resultsmentioning

confidence: 99%

Soil nitrogen and carbon changes in a biosolid amended sodic vertisol with a history of treated sewage effluent‐enriched water irrigation

Nachimuthu

Hulugalle

Watkins

et al. 2021

Soil Use and Management

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The application of biosolids to cropping soils may improve soil health, supply nitrogen and other nutrients for crops. There are specific guidelines on the quantity of biosolids that can be applied to a soil to grow selected crops. However, some recommendations overlook environmental factors such as soil organic N and N supplied by irrigation water. We conducted a three‐year field monitoring programme to study the effect of biosolid application on sodicity, soil nitrogen and organic carbon status to a depth of 1.8 m in a vertisol with a history of sewage effluent water irrigation. Biosolid application had no effect on soil sodicity. Improvements in soil organic carbon (SOC) were short‐lived and occurred only during the first year. N accumulation and leaching below the root zone (1.2 m) occurred after two years and suggest a possible off‐farm environmental risk. The higher residual mineral N in biosolid treatment 2 years after application implies an opportunity to reduce N inputs in vertisols treated with biosolids and effluent water. The biosolid application rate of 35 Mg ha−1 was well below the nitrogen‐limited biosolid application rate (NLBAR) (100 Mg ha−1) under the current guidelines. This warrants further refinement of NLBAR to suit specific circumstances such as effluent‐enriched water irrigation and additional in‐crop fertilizer application.

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“…The legacy data used in this study were sampled from 14 farms throughout eastern Australia by the University of Sydney and analysed between 2013 and 2019 (Filippi et al, 2019; Singh & Whelan, 2020) (Figure 1). A notable portion of the observations was collected by Singh and Whelan (2020) as part of an investigation into the change in SOC between 2013 and 2015 under various farm management regimes. The choice of the farms to sample was based on existing relationships with growers but all are situated in the agriculturally significant cropping region of eastern Australia.…”

Section: Methodsmentioning

confidence: 99%

Assessment of global, national and regional‐level digital soil mapping products at different spatial supports

Han

Filippi

Singh

et al. 2022

European J Soil Science

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Digital soil mapping provides estimates of soil properties and, in turn, an understanding of the spatial variation in soil across landscapes. In recent years, several digital soil mapping products have been released across the world. An end user in New South Wales (NSW), Australia, could choose between a global product (SoilGrids), a national product (Soil and Landscape Grid of Australia) and a state product (NSW digital soil maps). All predict at grid resolutions of 250 m or less, which approaches the required detail for within-field sitespecific management such as variable-rate application of agricultural inputs.In this study, the quality of clay and soil organic carbon (SOC) products (0-30 cm) from these three publicly available digital soil maps (DSM) were validated with an external dataset of 394 soil observations, collected from 14 farms across eastern Australia. Each farm was sampled using stratified random sampling, allowing for unbiased estimates of prediction quality at three spatial supports: point (soil core), strata (management zone) and farm. For the clay attribute, this study observed Lin's concordance correlation coefficient (LCCC) values of 0.22-0.37 at the point spatial support, far below reported values. This improved at the strata spatial support with LCCC values of 0.20-0.60 and the farm spatial support with values of 0.07-0.54. For SOC, LCCC values ranged from 0.25 to 0.45 for points, 0.31-0.55 for strata and 0.31-0.60 for farms. The grid resolution of DSMs depends largely on the resolution of the covariates used, and current efforts look to incorporate more recent, finer resolution covariates to create higher-resolution soil maps. However, the results of this study suggest that both the grid resolution and spatial support used in DSMs need further consideration. Rather than letting the resolution of covariates determine the resolution of DSMs, this should also be determined by the number of soil observations available for modelling, their distribution in geographic and attribute space and the prediction quality.

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Soil carbon change across ten New South Wales farms under different farm management regimes in Australia

Cited by 13 publications

References 50 publications

Biochar for sustainable soil management

Biochar for sustainable soil management

Soil nitrogen and carbon changes in a biosolid amended sodic vertisol with a history of treated sewage effluent‐enriched water irrigation

Assessment of global, national and regional‐level digital soil mapping products at different spatial supports

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