Lessons Learned From Long-Term Soil Fertility Management Experiments in Africa 2012
DOI: 10.1007/978-94-007-2938-4_4
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Strategies for Maintenance and Improvement of Soil Productivity Under Continuous Maize and Beans Cropping System in the Sub-humid Highlands of Kenya: Case Study of the Long-Term Trial at Kabete

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Cited by 6 publications
(3 citation statements)
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“…The bush bean yield had a weak, positive, and significant correlation with all selected parameters except pH. Even though the relationship between yield and other chemical attributes was weak, the yield increased with the increase of nutrients up to the application of 10 t ha-1 of organic fertilizer (Bucagu et al, 2017;Kibunja et al, 2012). The positive correlation between parameters indicated their inter-dependency (Duan et al, 2019;Nwokwu, 2020).…”
Section: Correlation Analysis Results At Harvesting Timementioning
confidence: 95%
“…The bush bean yield had a weak, positive, and significant correlation with all selected parameters except pH. Even though the relationship between yield and other chemical attributes was weak, the yield increased with the increase of nutrients up to the application of 10 t ha-1 of organic fertilizer (Bucagu et al, 2017;Kibunja et al, 2012). The positive correlation between parameters indicated their inter-dependency (Duan et al, 2019;Nwokwu, 2020).…”
Section: Correlation Analysis Results At Harvesting Timementioning
confidence: 95%
“…Wolaita is prone to drought, however, and the soils in the region (mostly Nitisols) are highly degraded and eroded (Bekele et al 2018). Muranga county has a bimodal rainfall pattern, with an average of 983 mm/year falling into two rainy seasons (mid-March to May and mid-October to December) (Kibunja et al 2012). Soils in the study area are also Nitisols and tend to be clayey and of moderate fertility.…”
Section: Site Description/backgroundmentioning
confidence: 93%
“…Sand, silt, clay content (international pipette method) Bulk density by core method [27] Hydraulic conductivity by constant head burette method [28] Water holding capacity by Keen Raczkowski box [29] Chemical pH in soil water suspension of 1:2 (w/v) ratio [30] Total organic C by combustion (TOC analyser, vario TOC select, Elementar, Germany) Oxidizable organic carbon by Walkley and Black [31] Cation exchange capacity by ammonium acetate method [30] Total N by microprocessor-based Kjeldahl digestion and distillation [32] Total K by hydroflouric acid decomposition method [33] Non-exchangeable K by subtracting 1 M ammonium acetate extractable K from boiling 1 M HNO 3 extractable K [34] Available N by alkaline 0.32% KMnO 4 extraction [35] Available P by 0.03M NH 4 F+0.025M HCl extraction [36] Available K by neutral 1.0 M ammonium acetate extraction [37] Available S by 0.15% CaCl 2 extraction [38] Available Zn, Cu, Fe and Mn by 0.005 M DTPA+0.01 M CaCl 2 +0.1 M TEA extraction [39] Available B by hot-water extraction [40] Biological Microbial biomass C by chloroform fumigation and extraction [41] Microbial biomass N chloroform fumigation and extraction [42] Dehydrogenase activity by triphenylformazan [43] Urease activity by THAM buffer method [43] Acid phosphatase activity modified universal buffer (pH 6.5) [43] Long-term applications of acidifying fertilizers and continuous cultivation gradually develop acidic soils [61]; Kibunja et al [62] It is known that application of urea accelerated soil acidity, whereas application of manure along inorganic fertilizers is effective in reducing soil acidity [19,63]. We observed a decrease in soil pH across the inorganic fertilizer treatments and the control from 5.80 (in the initial soil) to 5.19 after 9 years of puddled rice-rice cropping.…”
Section: Physicalmentioning
confidence: 99%