Discriminant functions for classifying erosion degraded lands at Otamiri, South Eastern Nigeria

Oti, NN

doi:10.4314/as.v3i1.1501

Cited by 8 publications

(14 citation statements)

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“…These low-moderate plastic fines are chiefly composed of Aluminium and iron oxides (sesquioxides) which serves as cement binding the individual soil matrix into bulk aggregates (Townsend & Reeds, 1971;Smith, 1990;Cornell & Schwertmann, 2003;Igwe et al, 2009;Peng & Sun, 2015). However, Oti (2002) reported that the resultant aggregates are relatively unstable when exposed to water; thus, leading to slaking and dispersion of the soil aggregate. This soil aggregate behaviour is attributed to its low exchangeable sodium percentage (ESP), reduced calcium-magnesium ratio due to its relatively high content of aluminium and iron, and low content of soil essential nutrients such as Na, Ca, and Mg, which helps in formation of water stable soil aggregates (Mbagwu & Auerswald, 1999;Oti, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…However, Oti (2002) reported that the resultant aggregates are relatively unstable when exposed to water; thus, leading to slaking and dispersion of the soil aggregate. This soil aggregate behaviour is attributed to its low exchangeable sodium percentage (ESP), reduced calcium-magnesium ratio due to its relatively high content of aluminium and iron, and low content of soil essential nutrients such as Na, Ca, and Mg, which helps in formation of water stable soil aggregates (Mbagwu & Auerswald, 1999;Oti, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Effect of environmental pollution on susceptibility of sesquioxide-rich soils to water erosion

Emeh

Igwe

2018

Geology, Ecology, and Landscapes

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This work assessed the impact of environmental pollution on soils susceptibility to water erosion within South-eastern Nigeria. Sources of pollutants which could possibly affect the chemical composition of runoff; hence its pH, were first determined by remote sensing and field observations. Rain and runoff water samples collected within the study area were analysed for its physicochemical compositions. Soil samples were also collected and analysed for their geotechnical properties, and chemical composition of their fine fractions. An empirical method was then employed to determine the effect of change in chemical composition of runoff on the susceptibility of the studied soil to water erosion. This was achieved by conducting soil aggregate slaking, dispersion and dissolution tests on aqueous solutions of varying pH. Results from the experiment shows that the fine particle fractions of the soils are chiefly composed of sesquioxides. The slaking of these sesquioxide-cemented soils is not affected by the variations in pH of the solutions, but rather by the plasticity index of the soils. However, dispersion and dissolution of the soil samples where dependent on variations in the pH of the solutions. It was therefore concluded that environmental pollution has the potential of increasing runoff erosivity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of environmental pollution on susceptibility of sesquioxide-rich soils to water erosion

Emeh

Igwe

2018

Geology, Ecology, and Landscapes

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“…The soil also exhibited deficiencies in total N, available P and exchangeable bases (Ca, Mg and K) when compared to the critical level of N = 0.15 -0.20% (Sobulo and Osiname, 1981), available P= 10-16 mg kg (Hunter, 1975), Ca=2.50 cmol/kg -1 (Akinrinde and Obigbesan, 2000) and Mg= 0.20 -0.40 cmol/kg -1 (Adeoye and Agboola, 1985) considered as optimum for Southern Nigeria soils. The Ca:Mg ratio was far below threshold limit of 3.0 (Oti, 2002). This further indicated Ca and P deficiencies.…”

Section: Resultsmentioning

confidence: 88%

“…The soil is moderately acidic (6.00) with organic carbon content of 0.96% corresponding to organic matter content of 1.65. This is low when compared to its critical level (Oti, 2002). Deficiency in organic matter is an indication of poor water and nutrient retention.…”

Section: Resultsmentioning

confidence: 99%

Agronomic efficacy of compost manure and NPK fertilizer on some soil chemical properties and maize production in an ultisol environment

Law-Ogbomo

Osaigbovo

Ekwueme

2012

JANS

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Studies were conducted as an on-farm trial at Evboneka in 2009 and 2010 cropping seasons to estimate the effect of soil amendments in enhancing soil fertility status and relative agronomic efficacy of maize yield in humid ultisol environment. Effects of compost was investigated at application rates of 20 and 40 t ha -1 while NPK and organo-mineral fertilizer effects were investigated at 200 kg/ha and a combination of 100 kg/ha NPK and 20 t/ ha compost manure (organo-mineral fertilizer) with maize TZEE-W cultivar resulting in five treatments and replicated three times. The results obtained revealed that the tested soil was low in organic matter, total N, available P, moderately acidic and low cations (Ca, Mg and K). The compost manure was rich in N, P, Mg, K, organic carbon and Ca concentration. The application of compost manure and NPK to the soil improved the soil fertility status. The highest maize height (132.70 cm), greatest total dry weight (0.63 t ha -1 ) and relative agronomic efficacy (%) were obtained from plots treated with 40 t/ha -1 compost manure while the plots treated with organo-mineral had the greatest LAI (2.75).

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“…Onweremadu et al (2007), Achmad et al (2003) and Scot et al (1994) found higher bulk densities during rainy season. Seasonal changes in bulk density are attributed to heavy annual rainfall that lasts for about 9 months and estimated to be 2500 mm thus clogging the pore spaces (Oti, 2002). Increased bulk density during the rainy season could also be attributed to reduced soil organic matter as a result of slow decomposition.…”

Section: Resultsmentioning

confidence: 99%

Seasonal Dynamics of Soil Organic Matter and Total Nitrogen in soils under different land uses in Owerri Southeastern Nigeria

Lc¹,

Osuji²,

Onweremadu³

et al. 2013

Agro-Sci.

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ABSTRACT:The study investigated seasonal dynamics of soil organic matter and total nitrogen in soils affected by different land use types in Owerri, Southeastern Nigeria. A total of 72 soil samples were randomly collected at two monthly intervals in the dry season (October/November, December/January and February/March) and rainy season (April/May, June/July and August/September) at 0-20 cm depth in all the studied land uses, namely soils under continuous cassava cultivation (CCS), pineapple orchard soil (POS), bush fallow (FS) and bare fallow (BF.) . Collected soil samples were air dried, passed through 2mm sieve and were analysed using standard methods. The experiment was factorially arranged in randomized complete block design (RCBD), with three factors namely, season, month and landuse. The treatments were replicated three times. Generated soil data were analysed using analysis of variance (ANOVA) and significant means were separated using least significant difference (LSD) at 5% probability. Results showed that soil organic matter and total nitrogen were significantly higher (P<0.05) in the dry season especially between January and April compared to the rainy season where the least was found around June/July in all the studied land uses, although in all cases, their variability was minimal, ranging from 30.

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Discriminant functions for classifying erosion degraded lands at Otamiri, South Eastern Nigeria

Cited by 8 publications

References 0 publications

Effect of environmental pollution on susceptibility of sesquioxide-rich soils to water erosion

Effect of environmental pollution on susceptibility of sesquioxide-rich soils to water erosion

Agronomic efficacy of compost manure and NPK fertilizer on some soil chemical properties and maize production in an ultisol environment

Seasonal Dynamics of Soil Organic Matter and Total Nitrogen in soils under different land uses in Owerri Southeastern Nigeria

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