#tropical soils

[biology-geology-beaches-india]

The Scientific research Notes Of S. Sunkavally (years: 2002-2011).

2040-2042.

[biology-geology-beaches-india]

The Scientific Research Notes Of S. Sunkavally (years: 2002-2011).

1547-1548.

[oaresearchpaper]

Enhancement of phosphorus utilization and availability in the mountainous region of Man, Côte d’Ivoire

The soil has a large reserve of phosphorus. However, phosphorus availability for plant nutrition is limited, and mostly in ferralitic tropical soils, determined by the geochemical distribution of elements. In the mountainous region of Man, West Côte d’Ivoire, the geology and geomorphology constitute a particular characteristic which, more or less, could significantly influence soil phosphorus distribution and availability. A study was thus setup to assess soil oxides and mineralogy, and their influence on soil phosphorous content in Man. Four different rice producing sites were selected for soil sampling; Krikouma, Dompleu, Blolé and Petit-Gbêpleu (PG). Within each site, three composite samples were taken at 0 – 20cm depth from 3 plot of 25m2, each. The results of the X-ray fluorescence analysis showed the presence of large quantities of iron and aluminium oxides in the soil. In addition, these soils were rich in SiO2. The mineralogical matrix had two dominant mineral species Berlinite and Quartz, dividing the soils into two categories. This study provides scientific base for developing strategies for a sustainable phosphorous fertilization of rice cropping soils.

[oaresearchpaper]

Enhancement of phosphorus utilization and availability in the mountainous region of Man, Côte d’Ivoire

The soil has a large reserve of phosphorus. However, phosphorus availability for plant nutrition is limited, and mostly in ferralitic tropical soils, determined by the geochemical distribution of elements. In the mountainous region of Man, West Côte d’Ivoire, the geology and geomorphology constitute a particular characteristic which, more or less, could significantly influence soil phosphorus distribution and availability. A study was thus setup to assess soil oxides and mineralogy, and their influence on soil phosphorous content in Man. Four different rice producing sites were selected for soil sampling; Krikouma, Dompleu, Blolé and Petit-Gbêpleu (PG). Within each site, three composite samples were taken at 0 – 20cm depth from 3 plot of 25m2, each. The results of the X-ray fluorescence analysis showed the presence of large quantities of iron and aluminium oxides in the soil. In addition, these soils were rich in SiO2. The mineralogical matrix had two dominant mineral species Berlinite and Quartz, dividing the soils into two categories. This study provides scientific base for developing strategies for a sustainable phosphorous fertilization of rice cropping soils.

[ijtsrd]

Assessment of the Engineering Properties and Suitability of Some Tropical Soils as Backfill Materials

By Johnbosco C. Egbueri | Ogbonnaya Igwe | Chidiebere H. Nnamani"Assessment of the Engineering Properties and Suitability of Some Tropical Soils as Backfill Materials"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-1 , December 2017,

URL: http://www.ijtsrd.com/papers/ijtsrd7041.pdf

http://www.ijtsrd.com/other-scientific-research-area/geology/7041/assessment-of-the-engineering-properties-and-suitability-of-some-tropical-soils-as-backfill-materials/johnbosco-c-egbueri

best journal, call for paper papers conference, technology journal, indexed journal

Little to none has been known about some soils excavated for backfilling purposes in Anambra State, Southeastern Nigeria. Thus, this study, which involved literature reviews, field sampling, and integrated geotechnical analyses, presents an assessment of their engineering properties and suitability as backfill (foundation, embankment, subgrade, and base) materials. Eight soil samples (ABG, NIM, OZB, NKA, OKJ, ORK, ULI, and NBI) from eight borrow pits were studied. Grain-size analysis revealed that the eight soils are dominantly composed of medium-coarse grains. Laboratory USCS identified and grouped the soils into five '“ GP, SW, SP, SC and CL. Their permeability coefficients ranged from 4.22x10-6 to 4.34x10-4m/sec, hence they are permeable. Compaction test revealed MDD range of 1.76'“1.94g/cm3, OMC range of 13.29'“17.10%, and bulk density range of 1.68'“1.90g/cm3. Their specific gravity ranged from 2.55-2.69. The soils have low natural moisture content, ranging from 1.61-8.00%. Atterberg limits of the fines showed that they are nonplastic to low plastic materials, with the highest PI as 12% (for the CL soil). The soils have low cohesion (0.66'“6.72kPa) but high frictional angle (32.54'“36.47o), except for the CL soil which has 27.31kPa cohesion and 19.34o friction angle. From the findings, it was deduced that, generally, these soils are good backfilling materials, though to varying degrees (SW?GP?SP?SC?CL), because of differences in their engineering properties. However, factors that could alter their good characteristics and suitability were discussed and recommendations given.

[innspubnet]

Chemical properties associated with guts, soil and nest materials of Odontotermes and Macrotermes species from Kenya - JBES

Chemical properties associated with guts, soil and nest materials of Odontotermes and Macrotermes species from Kenya – JBES

Edith Mnyazi Muwawa, Huxley Mae Makonde, Nancy L.M.Budambula, ZipporahLagat Osiemo, HamadiIddi Boga

Jomo Kenyatta University of Agriculture and Technology, P.O.Box 62000, Nairobi, Kenya

Technical University of Mombasa,TomMboya Street, Mombasa, P.O.Box 90420-80100.

TaitaTaveta University College, P.O.Box 635-80300 Voi, Kenya

Key words: Termites, mineralization, tropical soils, Macrotermitinae.

Abs…

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