Journal article
Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems
Soil and Tillage Research, Vol.175, pp.71-81
2018
Abstract
Soil organic matter (SOM) has the potential to supply substantial quantities of nutrients [i.e nitrogen (N), phosphorus (P) and sulphur (S)] for plant uptake. Yet there is little understanding of the impact of management on the nutrient supply potential in soils (particularly, P and S). To quantify N, P and S availability from SOM, surface soils (0–10 cm) were collected from 14 management practices across three long-term (16–46 years) experimental sites under semi-arid (Luvisol), Mediterranean (Luvisol) and sub-tropical (Vertisol) environments in Australia. The practices comprised conventional (CT) and reduced tillage (RT) with mixed farming, no-till with continuous cropping (NT), and perennial pasture (PP) in the semi-arid Luvisol, while in a Mediterranean direct-drilled continuous cropping system, stubble was either retained (SR) or burnt (SB). Practices on the Vertisol comprised a factorial combination of CT, NT, SR, SB with either 0 (0N) or 90 kg urea-N ha−1 (90N) in a continuous cropping system. Soils were incubated under controlled soil moisture and temperature, and cumulative organic C mineralised (Cmin), and net available N, P and S were measured over 126 days. In the semi-arid Luvisol, CT and/or RT showed significantly higher Cmin and net available N, P and S than NT and PP. In the Mediterranean Luvisol, Cmin and net available P were not influenced by stubble management. In the Vertisol, CT-SR (cf. CT-SB and NT-SR/SB) with or without N fertilisation significantly increased Cmin, and CT-SR and/or -SB with N fertilisation (cf. CT-SR/SB without N fertilisation and NT-SR and/or -SB with or without N fertilisation) significantly increased net available N and P. This study found a continuous release of net available N (11–49 kg N ha−1 over 126 days) across all management practices, whereas, the release of available P and S was evident only during the first 30 days (6–74 kg P ha−1, −4 to 22 kg S ha−1), after which microbial immobilisation or clay fixation of P and S predominated, particularly in the Vertisol. In conclusion, the results indicate that SOM is a ready source of plant available P and S (in addition to N), and tillage and stubble retention generally enhanced SOM mineralisation and nutrient release, which varied with soil type.
Details
- Title
- Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems
- Authors/Creators
- J.R. Sarker (Author/Creator) - New South Wales Department of Primary IndustriesB.P. Singh (Author/Creator) - New South Wales Department of Primary IndustriesW.J. Dougherty (Author/Creator) - New South Wales Department of Primary IndustriesY. Fang (Author/Creator) - New South Wales Department of Primary IndustriesW. Badgery (Author/Creator) - New South Wales Department of Primary IndustriesF.C. Hoyle (Author/Creator) - The University of Western AustraliaR.C. Dalal (Author/Creator) - The University of QueenslandA.L. Cowie (Author/Creator) - University of New England
- Publication Details
- Soil and Tillage Research, Vol.175, pp.71-81
- Publisher
- Elsevier B.V.
- Identifiers
- 991005543545207891
- Copyright
- © 2017
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Metrics
49 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.112 Soil Carbon Dynamics
- Web Of Science research areas
- Soil Science
- ESI research areas
- Agricultural Sciences