Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems

Jharna Rani Sarker, Bhupinder Pal Singh, Warwick J. Dougherty, Yunying Fang, Warwick Badgery, Frances C. Hoyle, Ram C. Dalal, Annette L. Cowie

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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.

LanguageEnglish
Pages71-81
Number of pages11
JournalSoil and Tillage Research
Volume175
DOIs
StatePublished - 1 Jan 2018

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Luvisol
agricultural management
farming system
Biological materials
Vertisol
Nutrients
Vertisols
soil organic matter
management practice
continuous cropping
farming systems
stubble
Soils
nutrient
tillage
nutrients
reduced tillage
cropping systems
pasture
pastures

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Sarker, Jharna Rani ; Singh, Bhupinder Pal ; Dougherty, Warwick J. ; Fang, Yunying ; Badgery, Warwick ; Hoyle, Frances C. ; Dalal, Ram C. ; Cowie, Annette L./ Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems. In: Soil and Tillage Research. 2018 ; Vol. 175. pp. 71-81
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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.",
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Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems. / Sarker, Jharna Rani; Singh, Bhupinder Pal; Dougherty, Warwick J.; Fang, Yunying; Badgery, Warwick; Hoyle, Frances C.; Dalal, Ram C.; Cowie, Annette L.

In: Soil and Tillage Research, Vol. 175, 01.01.2018, p. 71-81.

Research output: Contribution to journalArticle

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T1 - Impact of agricultural management practices on the nutrient supply potential of soil organic matter under long-term farming systems

AU - Sarker,Jharna Rani

AU - Singh,Bhupinder Pal

AU - Dougherty,Warwick J.

AU - Fang,Yunying

AU - Badgery,Warwick

AU - Hoyle,Frances C.

AU - Dalal,Ram C.

AU - Cowie,Annette L.

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N2 - 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.

AB - 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.

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KW - Nitrogen

KW - Phosphorus

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