Browsing by Author "Githongo, M.W."
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Item Greenhouse Gas Fluxes from Selected Soil Fertility Management Practices in Humic Nitisols of Upper Eastern Kenya(MDPI, 2022-02-08) Githongo, M.W.; Musafiri, C.M.; Macharia, J.M.; Kiboi, M.N.; Fliessbach, A.; Muriuki, A.; Ngetich, F.K.; University of Embu ; Cortile Scientific Limited ; Kenyatta University ; Research Institute of Organic Agriculture (FIBL) ; Kenya Agricultural and Livestock Research Organization - National Agriculture Research Laboratories ; Jaramogi Oginga Odinga University of Science and Technology (JOOUST)We quantified the soil carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes of five soil fertility management practices (inorganic fertilizer (Mf), maize residue + inorganic fertilizer (RMf), maize residue + inorganic fertilizer + goat manure (RMfM), maize residue + tithonia diversifolia + goat manure (RTiM), and a control (CtC)) in Kenya’s central highlands using a static chamber method from March 2019 to March 2020. The cumulative annual soil CH4 uptake ranged from −1.07 to −0.64 kg CH4-C ha−1 yr−1, CO2 emissions from 4.59 to 9.01 Mg CO2-C ha−1 yr−1, and N2O fluxes from 104 to 279 g N2O-N ha−1 yr−1. The RTiM produced the highest CO2 emissions (9.01 Mg CO2-C ha−1 yr−1), carbon sequestration (3.99 Mg CO2-eq ha−1), yield-scaled N2O emissions (YSE) (0.043 g N2O-N kg−1 grain yield), the lowest net global warming potential (net GWP) (−14.7 Mg CO2-eq ha−1) and greenhouse gas intensities (GHGI) (−2.81 Kg CO2-eq kg−1 grain yield). We observed average maize grain yields of 7.98 Mg ha−1 yr−1 under RMfM treatment. Integrating inorganic fertilizer and maize residue retention resulted in low emissions, increased soil organic carbon sequestration, and high maize yieldsItem The Effect of Minimum Tillage and Animal Manure on Maize Yields and Soil Organic Carbon in Sub-Saharan Africa: A Meta-Analysis(Elsevier B.V., 2021-12) Githongo, M.W.; Kiboi, M.N.; Ngetich, F.K.; Musafiri, C.M.; Muriuki, A.; Fliessbach, A.; University of Embu ; Cortile Scientific Limited ; Jaramogi Oginga Odinga University of Science and Technology (JOOUST) ; Kenya Agricultural and Livestock Research Organization ; Research Institute of Organic Agriculture FIBLIn sub-Saharan Africa (SSA), diminishing soil fertility has been experienced from continuous cropping and low nutrient replacement. Organic inputs and minimum tillage are proposed to increase the declining fertility of the soil to increase crop growth and yields. We reviewed animal manure and minimum tillage use on maize yields and soil organic carbon (SOC) in SSA. This involved a meta-analysis on the influence of minimum tillage and animal manure on maize grain yields and SOC. Reported data on maize yields and soil organic carbon were extracted from figures, tables, and text, of the selected studies. These studies were analyzed using R, and results were presented in a forest plot. Minimum tillage had no significant influence on maize yields and soil organic carbon. Animal manure significantly improved maize yields and soil organic carbon. The study underscored the importance of animal manure in improving maize yields and soil organic carbon in SSA. Animal manure application in maize cropping systems is plausible to increase maize yields and soil organic carbon in SSA.
