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Soil Organic Carbon and Labile Carbon Pools Attributed by Tillage, Crop Residue and Crop Rotation Management in Sweet Sorghum Cropping System

Author

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  • Mashapa Elvis Malobane

    (Agricultural Research Council—Institute for Soil, Climate and Water, P. Bag X79, Pretoria 0083, South Africa
    Department of Agriculture and Animal Health, University of South Africa, Private Bag X6, Florida 1710, South Africa)

  • Adornis Dakarai Nciizah

    (Agricultural Research Council—Institute for Soil, Climate and Water, P. Bag X79, Pretoria 0083, South Africa
    Department of Agriculture and Animal Health, University of South Africa, Private Bag X6, Florida 1710, South Africa)

  • Fhatuwani Nixwell Mudau

    (Department of Agriculture and Animal Health, University of South Africa, Private Bag X6, Florida 1710, South Africa
    School of Agricultural, Earth and Environmental Sciences, University of Kwazulu Natal, P. Bag X01, Scottsville, Pietermaritzburg 3209, South Africa)

  • Isaiah Iguna Chabaari Wakindiki

    (Department of Agriculture and Animal Health, University of South Africa, Private Bag X6, Florida 1710, South Africa
    Jaramogi Oginga Odinga University of Science and Technology, P.O. Box, Bondo 210-40601, Kenya)

Abstract

Labile organic carbon (LOC) fractions are considered as sensitive indicators of change in soil quality and can serve as proxies for soil organic carbon (SOC). Although the impact of tillage, crop rotation and crop residue management on soil quality is well known, less is known about LOC and SOC dynamics in the sweet sorghum production systems in South Africa. This short-term study tested two tillage levels: no-till and conventional-tillage, two crop rotations: sweet-sorghum/winter grazing vetch/sweet sorghum and sweet-sorghum/winter fallow/sweet sorghum rotations and three crop residue retention levels: 30%, 15% and 0%. Tillage was the main factor to influence SOC and LOC fractions under the sweet sorghum cropping system in South Africa. NT increased SOC and all LOC fractions compared to CT, which concurs with previous findings. Cold water extractable organic carbon (CWEOC) and hot water extractable organic carbon (HWEOC) were found to be more sensitive to tillage and strongly positively correlated to SOC. An increase in residue retention led to an increase in microbial biomass carbon (MBC). This study concludes that CWEOC and HWEOC can serve as sensitive early indicators of change in soil quality and are an ideal proxy for SOC in the sweet-sorghum cropping system in South Africa.

Suggested Citation

  • Mashapa Elvis Malobane & Adornis Dakarai Nciizah & Fhatuwani Nixwell Mudau & Isaiah Iguna Chabaari Wakindiki, 2020. "Soil Organic Carbon and Labile Carbon Pools Attributed by Tillage, Crop Residue and Crop Rotation Management in Sweet Sorghum Cropping System," Sustainability, MDPI, vol. 12(22), pages 1-10, November.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:22:p:9782-:d:449786
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    References listed on IDEAS

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    1. Turmel, Marie-Soleil & Speratti, Alicia & Baudron, Frédéric & Verhulst, Nele & Govaerts, Bram, 2015. "Crop residue management and soil health: A systems analysis," Agricultural Systems, Elsevier, vol. 134(C), pages 6-16.
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    Cited by:

    1. Sandisiwe, Zondo & Mahlambi, Precious, 2022. "Soil and irrigation water quality assessment for maize production in Buhle farm in Howick, Kwazulu-Natal province, South Africa," African Journal of Food, Agriculture, Nutrition and Development (AJFAND), African Journal of Food, Agriculture, Nutrition and Development (AJFAND), vol. 22(08).

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