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APPENDIX 5. Calculations used to figure probability of a
bacterium being at injury caused by emergence of secondary
root.
Bacterial size = 2,0 x 0.5
Root diameter = 0.25 mm
Bacterial density in agar = 1 cell/mm3
1 1 1
Formula = --x-.- x-- = probability
a = No. of bacterium diam in an mm = 2000
2
b = No. of root diam in an mm = 16
c = probability of a secondary root touching ane bacterium
at the point of emergence
= No. of cells in area occupied by root
total cells in mm3
1 1 1 1 x 9
2~0UX-Tt- xyg- = 3.1 x 10