Environmental & Physical Sciences

Environmental & Physical Sciences Research Papers/Topics

SOIL ACIDITY LEVELS UNDER DIFFERENT LAND USE SYSTEMS AND LIME REQUIREMENTS FOR THE DOMINANT SOIL TYPE OF SODO DACHI DISTRICT, OROMIA NATIONAL REGIONAL STATE, ETHIOPIA

Abstract: Soil acidity is one of the main factors affecting agricultural productivity in the highlands of Ethiopia. It is one of the problems that decrease the potential of arable lands for crop growth because of high rainfall in highland areas. The purpose of this study was to assess and quantify the extent of soil acidity under different land use systems and to determine the amount of lime required for neutralizing soil acidity in the study area. Three land uses (cultivated, grazing and na...

BIOGAS PRODUCTION FROM ANAEROBIC MONO AND CO DIGESTION OF POULTRY MANURE AND INVASIVE WEED SPECIES (Strigahermonthica)

Abstract: Bio-fuel production from agricultural, municipal, and industrial wastes through anaerobic digestion is meant for sustainable energy supply and eco-friendly waste management. Therefore, the objective of this study was to determine biogas yield using Strigahermontica as a solo substrate and co- digestion with poultry manure. The experimental analysis revealed that there was variation among the pH values of the substrates before and after anaerobic digestion. The mean pH value of the ...

PHYSICO-CHEMICAL AND MICROBIAL QUALITY OF DRINKING WATER IN WOLISO TOWN, SOUTH WEST SHOA ZONE, OROMIA, ETHIOPIA

Abstract: In Ethiopia, access to improved water supply and sanitation was estimated at 52% and 28%, respectively. Over 60-80% of the communicable diseases are arising from unsafe and inadequate water supply, poor hygiene condition and lack of regular treatment of water. This study was conducted to assess the microbial and physicochemical quality of drinking water in Woliso Town. The study was conducted from February 2016 to May 2016. A total of 51 water samples were collected from disinfecte...

CULTIVATION OF THREE SELECTED Pleurotus SPECIES USING GROWTH MEDIA PREPARED FROM SUGARCANE BAGASSE AND DRIED LEAVES OF Eichhornia crassipes AND Argemone ochroleuca

Abstract: Cultivation of edible mushrooms using agricultural invasive weeds could play a paramount role by producing foods with high nutritional value, and at the same time create environmentally friendly ways of food production. Thus, an experiment was conducted at Mushroom Research, Production and Training Laboratory of Haramaya University to cultivate three selected Pleurotus mushroom using three substrate and their combinations (dried leaves of Eichhornia crassipes (LEC) & Argemone ochro...

BIOGAS PRODUCTION FROM WATER HYACINTH (Eichhornia crassipes (Mart.) CO-DIGESTED WITH POULTRY MANURE

Abstract: The use of renewable energy sources can contribute to solve the present and future energy problems. Among the alternative energy sources, biogas production from green energy crops and organic waste has worldwide application as it yields a good quality fuel and fermented slurry, which may be used as a manure or soil conditioner. In this study, Biogas Production from Water Hyacinth (Eichhornia crassipes) Co-digestion with Poultry Manure in five mix ratios was evaluated under mesophil...

PRODUCTION OF BIOORGANIC LIQUID FERTILIZER FROM KHAT LEAVES AND ONION BULBS

Abstract: Microbial formulations for producing bioorganic liquid fertilizers are promising technology in the future. Thus, the present study was aimed to produce bioorganic liquid fertilizer from khat leaves and onion bulbs through aerobic fermentation in open containers. Macronutrient composition of bioorganic fertilizer and compost tea solutions indicated that Phosphorus (P), Potassium (K), calcium (Ca), and sodium (Na) were found to be significant between bioorganic liquid fertilizer and ...

BREWERY AND MUNICIPAL WASTEWATER QUALITY FOR IRRIGATION AND ITS IMPACTS ON SELECTED SOIL PROPERTIES AROUND HARAR CITY, EASTERN ETHIOPIA

Abstract: Wastewater contains a variety of chemical, physical and microbial contaminants which may significantly affect soil properties as well as ecosystem function when used for different purposes such as irrigation. Around Harar city, brewery and municipal wastewater has been in use for irrigating some crops cultivated in the area which may have impacted soil properties. The study was aimed to investigate the impacts of brewery and municipal wastewater (BMWW) on selected soil physico-chem...

PHYSICO-CHEMICAL CHARACTERIZATION OF MUNICIPAL SOLID WASTES AND ASSESSMENT OF ITS MANAGEMENT PRACTICES AT HADERO TOWN, SOUTHERN ETHIOPIA

Abstract: Tremendous waste generated rapidly and creates lots of problems in developing country like Ethiopia. If these solid wastes not managed properly, these would certainly have a negative impact on sustainable living style, local environment, and human health. Therefore, the objective of this study was to assess physico-chemical characterization of municipal solid wastes and assessment of its management practices. To achieve the objective, a cross-sectional descriptive survey design was...

VARIATION IN CARBON STOCK ALONG ENVIRONMENTAL GRADIENTS IN GARA-MUKTAR FOREST, WEST HARARGHE ZONE, EASTERN ETHIOPIA

Abstract: Forests play vital role in combating climate change through carbon sequestration in the atmosphere and serving as a carbon sink in the form of carbon pool systems of forest ecosystems. This study was aimed to estimate carbon stock variation along the environmental gradients and its contribution to climate change mitigation in Gara-Muktar forest, Western Hararghe zone, Eastern Ethiopia. A systematic sampling method of thirty- six quadrant plots having a size of 20m x 20m each distri...

DIVERSITY, DISTRIBUTION AND RELATIVE ABUNDANCE OF MEDIUM AND LARGE-SIZED MAMMALS IN CHUKALA MOUNTAIN FOREST, EAST SHEWA ZONE, OROMIA REGIONAL STATE, ETHIOPIA

Abstract: An extension of human activities including agriculture into the natural vegetation was resulting negative impacts like decreasing population of the wildlife inhabited the natural habitat. This study was conducted to assess and document diversity, distribution, relative abundance of medium and large size mammals in Chukala Mountain Forest. Preliminary survey was conducted and three habitat types montane forest with grassland, woodland and Bush land were identified. A line transect s...

COMPARISON OF WOODY SPECIES DIVERSITY, POPULATION STRUCTURE AND PROVISIONING ECOSYSTEM SERVICES ALONG DISTURBANCE REGIME IN BABILE ELEPHANT SANCTUARY, ETHIOPIA

Abstract: The study was conducted at Babile Elephant Sanctuary (BES), to identify and document the list of woody species, and to analyze diversity, richness, evenness and population structural status of woody species and importance of provisioning ecosystem services. The diversity of plant species and population structure of woody species were analysed from 60 quadrats, each with 20 m x 20 m for trees and 5 m x 5 m for shrubs and climbers, using systematic sampling methods with three levels ...

THE EFFICIENCY OF BIOGAS PRODUCTION FROM CO-DIGESTION OF Gossypium barbadense L. LEAVES WITH COW DUNG THROUGH ANAEROBIC FERMENTATION

Abstract: Biogas generation and its utility as an alternative renewable energy source are gaining attention, particularly among developing countries. In this study, biogas production was evaluated from Gosspium barbadense leaves (GB) and cow dung (CD) co-digestion in five mixed ratios (A =100% GB, B=25 % GB+75% CD, C=50%GB+50%CD, D=75 %GB+25%CD, E= 100% CD.) under mesophilic conditions using batch digesters. The daily biogas production was subsequently measured by the water displacement meth...

SOIL FERTILITY STATUS AND MAPPING UNDER DIFFERENT LAND USE TYPES ALONG TOPOSEQUENCE IN DINSHO DISTRICT OF BALE HIGHLAND, SOUTHEASTERN, ETHIOPIA

Abstract: Soil fertility depletion is the major challenge for agricultural production in southeastern highlands of Ethiopia and particular in the study area. Inadequate information on soil fertility status is one of the main constraints for site-specific appropriated soil fertility managements in the study area. The study was conducted to assess soil fertility status and mapping under different land use types along toposequence in Dinsho District of Bale highland Southeastern, Ethiopia. Base...

Woody Species Diversity and Carbon Stock along Altitudinal Gradient in Jallo Muktar Dry Evergreen Afromontane Forest, West Hararghe Zone, Ethiopia

Abstract: This study was conducted in Jallo Muktar forest, Western Hararghe Zone, Ethiopia. Data were collected from December 2018 to January 2019 with the aim of woody species diversity and carbon stock estimation along altitudinal gradients. Transects were laid out on three altitudinal gradients namely lower altitude (LA:2060 – 2410 m.a.s.l.), middle altitude (MA: 2411– 2760 m.a.s.l.) and upper altitude (UA: 2761 -3017 m.a.s.l). A total of 60 sample plots of 20m×20m (400 m2) in each a...

THE IMPACT OF TEMPERATURE PRETREATMENT ON BIOGAS YIELD FROM SAWDUST, CO-DIGESTED WITH COW DUNG

Abstract: Renewable resources play a significant role in reducing carbon dioxide emissions around the world, and with this in mind, biomass and waste is a candidate to be one of the most widely utilized renewable energy resources. Therefore, this research was conducted to investigate the production of biogas from saw dust, cow dung in solo or mix through anaerobic digestion with five treatment ratios, under mesophilic condition (38ºC) using batch digesters at Haramaya University for 30 days...


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