ABSTRACT
The effect of pesticides,
chchlorodipheny trichloroethane (DDY) and Benzene hexaxhoride (BHc) on
the microflora of the three types of soil (loamy, clay and sandy soil)
was conducted. The serial dietitian technique was employed up to 10-3
using nutrient agar, potato dextrose agar and sabourand agar plates. The
isolation of both bacterial and fungal organisms were made before
treating the soil types with the two pesticides), D.D.T and BHC. and
after treating the soil types with D.D.T after treating and BHc. The
highest bacterial count before treating the soil types with D.D.T and
BHc was got in loamy soil with 133 per ml having PH 7.1, followed by
clay soil with 78 per ml and least was sandy soil with 42 per ml. while
the highest bacterial count after treating the soil types with D.D.T
was gotten in loamy soil 105 per ml, followed by clay soil with 51 and
least count was got in sandy with 28 per ml. Also the highest bacterial
count after treatment with BHc was obtained in loamy soil with 12F per
ml, followed by clay soil with 64 per ml and the least count was got
from sand soil with 37 per ml. The highest bacterial isolate from all
the soil types before treatment with the two pesticides was pseudomonas
with 25 per ml, followed by Bacillus SPP with 24 per ml, and next
was achnomycetes with 19 per ml while the least bacterial organism was
Rhizobrium SPP. The fungal organisms isolates were Aspergillus species,
syncophatastrum species, pernicillum species and mucor species. The
results of this project showed that there was reduction in microflora of
the soil types after treatment separately with the two pesticides. But
the effect was more with D.D.T than with BHc. Also the effects of the
two pesticides was highest in sandy soil followed by clay and lastly the
loamy soil.
TABLE OF CONTENT
Title pages
Certification page
Acknowledgement
Dedication page
Abstract
Table of contents
CHAPTER ONE
Introduction
1.2Aims and objectives
1.3Statement of problem
1.4Hypothesis
1.5Limitation of the study
CHAPTER TWO
Literature review
2.1Pesticide labeling and safety
2.2Various classes and types of pesticides.
2.3Effects of pesticide on population of invertebrates in soil
2.4Effects of pesticides on population of vertebrates in the soil
2.5Effects of pesticides on population of micro organism in the soil
CHAPTER THREE
3.0Materials and methods
3.1materials
3.2Methods
3.2.1Sterilization
3.2.2 Collection of pesticides
3.2.3Collection of three types of soil loamy clay sandy
3.2.4 Preparation of media
2.2.5Playing technique
3.2.6 Microbial count, staining and microscopic work
3.2.7Identification of would
3.2.8 Biochemical test for identification
CHAPTER FOUR
Result
CHAPTER FIVE
Discussions
CHAPTER SIX
6.0Conclusion and recommendation
6.1conclusion
6.2recommendation
References
Appendix