A Comparison of the Contributions of Clay, Silt, and Organic Matter to the Effective Cec of Soils in Sub-Saharan Africa

Asadu, C. L. A.

doi:10.1097/00010694-199806000-00010

Cited by 19 publications

(21 citation statements)

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“…Tropical ferruginous soils are characterized by a high water infiltration rate (leading to high drainage) in sandy soils and a low water-holding capacity unless soil organic matter content is improved [9,11]. In fact, low activity of kaolinite (1:1 clay type) which is the dominant clay in these soils suggests that other fine elements (e.g., silt) intervene in complexes with soil organic matter and play a certain role in soil chemical (CEC) properties by influencing its capacity for storage and exchange of nutrients as reported by previous workers [9,50]. In such sandy soils, an increase of 1 g kg −1 of organic carbon leads to an increase of 4.3 mol kg −1 of CEC [51].…”

Section: Discussionmentioning

confidence: 81%

Optimizing yield of improved varieties of millet and sorghum under highly variable rainfall conditions using contour ridges in Cinzana, Mali

et al. 2017

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Background: Low productivity of cereals, the staple food, in Sahelian zone of Cinzana in Mali is caused by a range of factors including but not limited to inherent low soil fertility, and insufficient and inadequate distribution of the rainfall due to high climate variability. In addition, the small amount of rain falls as heavy storms in very short periods of time leading to water losses by runoff which in turn causes a lot of erosion. The two phenomena therefore call for a combination of both strategic (combating erosion) and tactical (coping with inter-and intra-annual rainfall variability) measures to cope with the production uncertainties in such risk-prone environment. As opposed to most farmers' practice of using the same variety, a tactical solution of using varieties of different cycles for different rainfall amounts/patterns was thought to be worth testing. Varieties of different cycles for different rainfall amounts/patterns were combined with a well-known soil and water conservation practice which is the contour ridge tillage (CRT). The combined effects of the two measures on the production of different varieties of sorghum and millet as well as on soil water content were assessed in on-farm participatory trials in five villages. The experiment was run during three consecutive years (2012, 2013 and 2014).Results: A key finding of this research is that regardless of the yearly rainfall amount and provided CRT is used, there were large differences in yields between improved varieties and local ones. This is a result of higher soil water conservation and better response of the improved varieties. Conclusion:The use of CRT increases considerably the yields of improved varieties of the most important staple crops of the Cinzana commune which are millet and sorghum. Thus, the use of these early maturing improved varieties, along with CRT, could be an accessible adaptation strategy to climate variability by farmers.

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Section: Discussionmentioning

confidence: 81%

Optimizing yield of improved varieties of millet and sorghum under highly variable rainfall conditions using contour ridges in Cinzana, Mali

et al. 2017

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“…These soil OM contents in DMC systems, higher than those of DS and TS systems, meant that the vegetation cover permitted the soil OM content to be maintained (Mekuria and Aynekulu, 2013), favoured by regular supply of mulch (AFD/FFEM, 2007). The soil fertility quality in DMC systems was partly due to soil OM contents that concurred to increase the sum of exchangeable bases values and particularly, those of the CEC (Thompson et al, 1989;Asadu et al, 1997). The increase in clay content of DMC systems also contributed to the physical protection of soil OM.…”

Section: Evolution Of Physical and Chemical Properties Of Soils And Smentioning

confidence: 96%

Impact of land management system on crop yields and soil fertility in Cameroon

2015

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Abstract. The impact of direct-seeding mulch-based cropping systems (DMC), direct seeding (DS) and tillage seeding (TS) on Sorghum yields, soil fertility and the rehabilitation of degraded soils was evaluated in northern Cameroon. Field work consisted of visual examination, soil sampling, yield and rainfall data collection. Three fertilization rates (F1: 100 kg ha −1 NPK + 25 kg ha −1 of urea in DMC, F2: 200 kg ha −1 NPK + 50 kg ha −1 of urea in DMC and F3: 300 kg ha −1 NPK + 100 kg ha −1 of urea in DMC) were applied to each cropping system (DS, TS and DMC), resulting in nine experimental plots. Two types of chemical fertilizer were used (NPK 22.10.15 and urea) and applied each year from 2002 to 2012. Average Sorghum yields were 1239, 863 and 960 kg ha −1 in DMC, DS and TS, respectively, at F1, 1658, 1139 and 1192 kg ha −1 in DMC, DS and TS, respectively, at F2, and 2270, 2138 and 1780 kg ha −1 in DMC, DS and TS, respectively, at F3. pH values were 5.2-5.7 under DMC, 4.9-5.3 under DS and TS and 5.6 in the control sample. High values of cation exchange capacity were recorded in the control sample, TS system and F1 of DMC. Base saturation rates, total nitrogen and organic matter contents were higher in the control sample and DMC than in the other systems. All studied soils were permanently not suitable for Sorghum due to the high percentage of nodules. F1 and F2 of the DS were currently not suitable, while F1 and F3 of DMC, F3 of DS and F1, F2 and F3 of TS were marginally suitable for Sorghum due to low pH values.

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“…Therefore, such soils have lower yield potentials than those with higher CECs (Asadu et al, 1997). According to Asadu et al, (1997) low values of CEC may be attributed to low clay and humus contents as well as low pH values. They indicate a degree of soil infertility.…”

Section: Cations Exchange Capacitymentioning

confidence: 99%

“…The different kinds of rocks, minerals, and other geologic materials from which the soil originally formed play a role. The kinds of plants or other vegetation that grow on the soil are also important, (Asadu et al, 1997) [2] . This study was initiated to investigate the influence of some land-use practices on the fertility status of some soils.…”

Section: Introductionmentioning

confidence: 99%

Soil Fertility Analysis of Smallholder Farms in Bugaje and Kusa Villages of Jibia Local Government Area, Nigeria

Ibrahim¹,

Maiwada²

2014

IOSRJAVS

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A Comparison of the Contributions of Clay, Silt, and Organic Matter to the Effective Cec of Soils in Sub-Saharan Africa

Cited by 19 publications

References 0 publications

Optimizing yield of improved varieties of millet and sorghum under highly variable rainfall conditions using contour ridges in Cinzana, Mali

Optimizing yield of improved varieties of millet and sorghum under highly variable rainfall conditions using contour ridges in Cinzana, Mali

Impact of land management system on crop yields and soil fertility in Cameroon

Soil Fertility Analysis of Smallholder Farms in Bugaje and Kusa Villages of Jibia Local Government Area, Nigeria

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