期刊名称：The Journal of Sustainable Development in Africa (JSDA)
电子版ISSN：1520-5509
出版年度：2006
卷号：8
期号：2
页码：144-144
出版社：Institute of Sustainable Development in Africa
摘要：A study was carried out to determine the survival of Pseudomonas syringae pv tomato (P. s. pv.
tomato) in the soil. Sandy, loam and clay soils were collected from Chinamhora communal area
and sterilised before inoculation with an estimate of 5 x 1010 cfu/ml of P.s.pv. tomato bacterium.
The inoculated soils were incubated at room temperature in the laboratory for four months. Two
soil conditions wet and dry were maintained throughout the experiment for each of the soil
types. Bacterial population in the different soils was measured by the plate dilution method on a
monthly basis for 4 months. Soil type and soil moisture significantly (P<0.01) affected the
survival of P.s. pv. tomato in the soil. The bacterium survived well in wet soils as was shown by
higher number of colony forming units than in dry soils. Sandy soils had the highest number
colony-forming units then loam and clay had the least number. It was concluded that as the
texture becomes finer the bacterial growth decreases as air spaces decrease. Therefore sandy
soils support more bacteria than loam and clay soils respectively. Wet soils had a higher
population of the bacterium than dry soils. Therefore the combination, which had more bacteria
surviving, was wet sand soil.
