Microaggregate Stability and Organic Carbon Fractions of a Tropical Loamy Sand Amended with Pig-Composted Manure
1 Department of Soil Science and Land Management, University of Agriculture, Abeokuta. Nigeria
2 Department of Soil Science and Land Management, University of Agriculture, P. M. B. 2240, Abeokuta 110001, Ogun-State, Nigeria.
* Corresponding author: adesodunjk@funaab.edu.ng
2 Department of Soil Science and Land Management, University of Agriculture, P. M. B. 2240, Abeokuta 110001, Ogun-State, Nigeria.
* Corresponding author: adesodunjk@funaab.edu.ng
Abstract
Soil organic carbon (SOC) is important in restoration of microaggregate stability of tropical soils. This study evaluated effect of pig-composted manure applied at 0, 5, 10 and 15 Mg ha-1 to cultivated land and forest re-growth land on distribution of organic carbon (OC) fractions and microaggregate stability using principal component analysis (PCA). The cultivated land was planted with two varieties of maize (Zea mays): TZESR-W (improved variety) and OHORI (local variety). Soil samples were collected from 0-20 cm depth and analyzed for total organic carbon (TOC) within 2000-200 μm, 200-63 μm and <63> nHOC > fPOC > oPOC > aHOC. Distribution of TOC within aggregates was similar to OC fractions in whole soil. The result showed that < 63 μm associated-OC was highest followed by 200-63 μm-OC while OC was least in 2000-200 μm aggregates. Correlations were highly significant between ASC and TOC (r = 0.84***) and ASC and < 63 μm associated- OC (r = 0.85***); while correlation between CFI and 2000-200 μm associated-OC was high (r = 0.70*). To remove multicollinearity, principal component analysis grouped the six correlated OC fractions (fPOC, aHOC, TOC, 2000-200 μmOC, 200-63 μmOC and < 63 μmOC) to two component defining variables (CDVs), i.e. fPOC and TOC. Multiple regression was used to show the relationship between the retained variables (fPOC and TOC) and the two indices of better microaggregation (ASC and CFI); and the results showed fPOC and TOC only correlated significantly (r = 0.73* ) with ASC.
Keywords
microaggregate stability
organic carbon fractions
forest re-growth
cultivated land
principal component analysis
compost
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How to Cite
Kayode, A. J., & Adekonojo, O. S. (2011). Microaggregate Stability and Organic Carbon Fractions of a Tropical Loamy Sand Amended with Pig-Composted Manure. Nigerian Journal of Soil Science, 21(2), 80-89. https://doi.org/10.67042/njss.2011.jlyprr3y
A. J. Kayode, and O. S. Adekonojo, "Microaggregate Stability and Organic Carbon Fractions of a Tropical Loamy Sand Amended with Pig-Composted Manure," Nigerian Journal of Soil Science, vol. 21, no. 2, pp. 80-89, August 2011. doi: 10.67042/njss.2011.jlyprr3y
