Data

Impact of management on soil carbon and nutrient cycling and storage under contrasting farming systems

University of New England, Australia
Singh, Bhupinder ; Cowie, Annette ; Sarker, Jharna ; NSW Department of Primary Industries
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
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BP.Singh@dpi.nsw.gov.au

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For this research, soils were collected from three long-term (16–46 years) management systems in semi-arid (Luvisol, at Condobolin, NSW), Mediterranean (Luvisol, at Merredin, WA) and sub-tropical (Vertisol, at Hermitage, QLD) environments in Australia from 0–10 cm, 10–20 cm and 20–30 cm depths. The practices at Condobolin comprised conventional (CT) and reduced tillage (RT) under mixed crop-pasture rotation, no-till (NT) under continuous cereal–cover crop rotation, and perennial pasture (PP). The practices at Merredin comprised stubble either retained (SR) or burnt (SB) under direct-drilled continuous wheat–legume rotation. The practices at Hermitage comprised a factorial combination of CT, NT, SR, SB, with either 0 (0N) or 90 kg urea-N ha-1 (90N) under continuous wheat–wheat rotation. To see soil aggregate stability, and SOC and nutrient stocks across the three long-term sites, dry and wet sieving techniques were performed to fractionate mega- (> 2 mm), macro- (2–0.25 mm), micro-aggregate (0.25–0.053 mm) and silt-plus-clay (< 0.053 mm) fractions. Further, to understand SOC and nutrient (N, P and S) mineralisation dynamics in bulk soil and soil aggregates, soils with or without crop residues were incubated for 126 days. To understand the allocation dynamics of newly assimilated C and N in a canola crop–soil system with different tillage and N fertilisation treatments, a field-based 13C15N isotopic study was performed at Wagga Wagga, NSW. The results showed that long-term management practices influenced carbon and nutrient (N, P and S) concentrations in soil aggregates, although had minimal impact on soil carbon and nutrient storage and aggregate stability. Soil organic matter was shown as a ready source of plant-available nutrients with variations across management practices. Crop stubble input in tilled (cf. no-till) systems caused a greater release of available nutrients. Further, tillage enhanced newly-assimilated carbon input into a soil system, leading a greater crop nitrogen uptake. These novel findings enhanced understanding of the impact of management practices on soil carbon and nutrient storage and nutrient availability in agro-ecosystems.

Notes

Related Publications
Tillage and nitrogen fertilisation enhanced belowground carbon allocation and plant nitrogen uptake in a semi-arid dryland canola crop–soil system dx.doi.org/10.1038/s41598-017-11190-4
Carbon and nutrient mineralisation dynamics in aggregate-size classes from different tillage systems after input of canola and wheat residues https://doi.org/10.1016/j.soilbio.2017.09.030
Agricultural management practices impacted carbon and nutrient concentrations in soil aggregates, with minimal influence on aggregate stability and total carbon and nutrient stocks in contrasting soils
Influence of tillage systems and crop residue input on native carbon mineralisation and availability of nitrogen, phosphorus and sulphur in contrasting soils
Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems https://doi.org/10.1016/j.still.2017.08.005
Funding Source
Grains Research and Development Corporation-DAN00169-GRDC Research Funding

Issued: 2017-10-31

Date Submitted : 2017-10-31

Data time period: 2013 to 2016

This dataset is part of a larger collection

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Subjects
Agricultural and Veterinary Sciences | Agricultural, Veterinary and Food Sciences | Agriculture, Land and Farm Management | Agricultural Management of Nutrients | Agricultural Systems Analysis and Modelling | Agriculture, Land and Farm Management | Crop and Pasture Production | Crop and Pasture Nutrition | Crop and Pasture Nutrition | Crop and Pasture Production | Environment | Environmental Management | Environmental Sciences | Environmentally Sustainable Plant Production | Environmentally Sustainable Plant Production Not Elsewhere Classified | Evaluation, Allocation, and Impacts of Land Use | Farming Systems Research | Farmland, Arable Cropland and Permanent Cropland Land Management | Farmland, Arable Cropland and Permanent Cropland Soils | Land and Water Management | Plant Production and Plant Primary Products | Soil Sciences | Soils | Soil Chemistry (Excl. Carbon Sequestration Science) | Soils | Terrestrial Erosion | Terrestrial Systems and Management |

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