A Comparison of the Contributions of Clay, Silt, and Organic Matter to the Effective Cec of Soils of Subsaharan Africa.

Asadu, C. L. A.; Diels, Jan; Vanlauwe, Bernard

doi:10.1097/00010694-199711000-00003

Cited by 61 publications

(23 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clay aggregates have been found as light minerals in the sand and silt fractions of the inceptisols and alfisols from Southern Brazil and sand and silt-sized dkaolinite flakesT (called dpseudomorphic micasT due to their similarity with micaceous minerals) have also been observed (Melo et al, 1995). In highly weathered soils, iron sesquioxides can cover clay minerals and cement clay particles to each other to produce silt-sized dflakyT pseudo-aggregates (Partiff et al, 1995;Asadu et al, 1997).…”

Section: Mineralogymentioning

confidence: 99%

Mineralogy and ion exchange properties of the particle size fractions of some Brazilian soils in tropical humid areas

et al. 2005

View full text Add to dashboard Cite

Section: Mineralogymentioning

confidence: 99%

Mineralogy and ion exchange properties of the particle size fractions of some Brazilian soils in tropical humid areas

et al. 2005

View full text Add to dashboard Cite

“…Vegetation on top of the baseline soil may have contributed to higher plant biomass and OM contents. Moreover, baseline soil has higher CEC value compared to those at three targets, possibly due to the higher OM contents in baseline soil [6]. However, the CEC value of all soil samples decreased with decreasing pH value.…”

Section: Results and Discussion Physico-chemical Properties Of Shootimentioning

confidence: 87%

EFFECTS OF RAIN pH, SOIL ORGANIC MATTER, CATION EXCHANGE CAPACITY AND TOTAL LEAD CONTENT IN SHOOTING RANGE SOIL ON THE CONCENTRATION OF LEAD IN LEACHATE

Yong

Zin

Ariff

2016

MJAS

View full text Add to dashboard Cite

Leaching of lead (Pb) from the shooting range soil may contaminate water resource if rain pH decreases and soil has a low cation exchange capacity (CEC). Over exposure of Pb may cause brain injury and death. In this study, leaching of Pb from shooting range soil was simulated with column leaching test using artificial rain at pH 4 and 7. Soil physico-chemical parameters (i.e. pH, organic matter (OM), and CEC) were determined, and its' correlation with Pb concentrations in soil (Soil Pb) and leachate (Leachate Pb) were studied using Pearson's correlation. Compare to control soil, shooting range soil has higher contents of Pb (12,163 -17,278 mg/kg, dry weight basis) and sand (64 -68 %). The CEC value of shooting range soil (193 cmol/kg at pH 7) is lower than those in control soil (85 -140 cmol/kg at pH 7), possibly due to low contents of clay and OM. There is positive correlation between Soil Pb and Leachate Pb variable pair (r = 0.94; p = 0.06); while Soil OM and Leachate Pb variable pair has a negative correlation (r = -0.94; p = 0.06). In conclusion, the combination of high soil Pb content, low CEC, and low rain pH increases leaching of Pb from shooting range soil.Keywords: lead shots, heavy metal, groundwater, acid rain, sorption Abstrak Larut lesap Pb daripada tanah lapang sasar boleh mencemarkan sumber air jika nilai pH hujan menurun dan tanah mempunyai keupayaan pertukaran kation (CEC) yang rendah. Pendedahan Pb yang keterlaluan boleh menyebabkan kecederaan otak dan kematian. Dalam kajian ini, larut lesap Pb dari tanah lapang sasar telah disimulasikan dengan ujian larut lesap turus menggunakan air hujan tiruan pada pH 4 dan 7. Parameter tanah (iaitu, pH, jirim organik (OM), dan CEC) telah ditentukan, dan dikaji korelasinya dengan kepekatan Pb di dalam tanah dan larut resap dengan menggunakan korelasi Pearson. Berbanding dengan tanah kawalan, kandungan Pb (12163 -17278 mg/kg, secara berat kering) dan pasir (64 -68 %) pada tanah lapang sasar adalah lebih tinggi. Nilai CEC tanah lapang sasar (193 cmol/kg pada pH 7) adalah lebih rendah daripada tanah kawalan (85 -140 cmol/kg pada pH 7), mungkin disebabkan oleh kandungan rendah tanah liat dan jirim organik. Terdapat hubungan yang positif antara pasangan pemboleh ubah Pb tanah dan Pb larut lesap (r = 0.94; p = 0.06); manakala pasangan pemboleh ubah jirim organik tanah dan Pb larut lesap mempunyai korelasi negatif (r = -0,94; p = 0.06). Kesimpulannya, gabungan faktor-faktor seperti kandungan Pb yang tinggi di dalam tanah, nilai CEC tanah yang rendah dan nilai pH hujan yang rendah boleh meningkatkan risiko larut lesap Pb dari tanah lapang sasar.Kata kunci: peluru plumbum, logam berat, air bawah tanah, hujan berasid, jerapan

show abstract

“…Based on the above ratings, the CEC values of the soils are rated medium. M. Yakubu et al [54] opined that organic matter content of soils which normally influences the CEC is generally low and therefore the CEC values may not be attributed to the amount of organic matter but for most tropical soils the contribution of organic matter to CEC is often greater than 50 % [10,15].…”

Section: Resultsmentioning

confidence: 99%

Comparison of the Suitability of Contiguous Fallow-forest Lands for Cassava, Yam, Cocoyam and Sweet Potato Production in Nsukka, Southeastern Nigeria

Asadu

Dixon²,

Ajogu

et al. 2017

PoS

View full text Add to dashboard Cite

Abstract. This analysis compared the suitability of contiguous fallow-forest lands for cassava, yam, cocoyam and sweet potato production in Nsukka, south-eastern Nigeria. The fallow plots were brought into cultivation in 1998 under the IITA-UNN long-term collaborative research. The sole cassava plots were grown to cassava only continuously for five years and then left to fallow. Soil samples were collected from 0-20 cm depth in triplicates using an auger and core sampler from the seven representative fallow plots previously grown to sole cassava from 1998-2003 and under fallow till date as well as the adjacent forest land. The objective was to use the soil qualities as recovered during the fallow period and those from the original adjacent forest to determine their current suitability for the production of the four crops. Using the FAO's principle of limiting conditions revealed that after 13 yrs of fallow, the plots grown to sole cassava was classified as highly suitable (S1) for sweet potato production but moderately suitable (S2) for cassava, yam and cocoyam production. The remnant forest land was highly suitable for sweet potato production but moderately suitable for cassava, yam and cocoyam production. The dominant soil limitations are organic matter, low cation exchange capacity and exchangeable potassium for both cassava and yam production. The major limitations to cocoyam production are low available phosphorous, base saturation and soil pH. If these constraints are addressed adequately by soil nutrient management programmes all the plots will scale up to S1 class for the four crops.

show abstract

A Comparison of the Contributions of Clay, Silt, and Organic Matter to the Effective Cec of Soils of Subsaharan Africa.

Cited by 61 publications

References 14 publications

Mineralogy and ion exchange properties of the particle size fractions of some Brazilian soils in tropical humid areas

Mineralogy and ion exchange properties of the particle size fractions of some Brazilian soils in tropical humid areas

EFFECTS OF RAIN pH, SOIL ORGANIC MATTER, CATION EXCHANGE CAPACITY AND TOTAL LEAD CONTENT IN SHOOTING RANGE SOIL ON THE CONCENTRATION OF LEAD IN LEACHATE

Comparison of the Suitability of Contiguous Fallow-forest Lands for Cassava, Yam, Cocoyam and Sweet Potato Production in Nsukka, Southeastern Nigeria

Contact Info

Product

Resources

About