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The quantity of organic carbon (OC), Mn and Cu released by different cropping systems into the soil were studied in Lagos southwestern Nigeria in 2012. The cropping practices were Organic Farm Plots (A), Manually Continuous Cropping (B), Agroforestry (C) and Convetional Tilled Farmers Plot (D) with the use of machineries. There was no fertilizer application except organic plots. Three soil depths were sampled at 0-15, 15 -30 and 30 - 45 cm and replicated three times. The soil samples were transferred to the laboratory for analysis. The design was completely randomized (CRD). Agroforest plots absorbed more OC than other farming practices. There were significant (p<0.05) differences in the amount of Mn and Cu released by different cropping methods. Among the cropping practices, agroforestry and organically manured soil recorded the highest sequestration of organic carbon. Different cropping patterns sequestrate OC, Mn and Cu at different rates and at different depths, therefore good cropping practices could be used to stock organic carbon.Micronutrients contents were found to decrease down with depth in all the study sites.

Effect of different Cropping Practices on Mn and Fe Sequestration in Lagos Nigeria