Influence of Tillage and Daily Manure Application on the Survival of Bacterial Pathogens Indicators in Soil and on Radish

Table 2

Escherichia coli and Enterococcus sp. mean numbers on radish roots (Raphanus sativus L.) and in rhizosphere soil after 84 days when growing in soil amended with inorganic fertilizer (control) and solid dairy manure with deep (chisel) tillage to a 20 cm depth or shallow (roller) tillage to a 10 cm depth.

Dairy waste	Tillage	Rhizosphere Soil		Radish Peel
		E. coli	Enterococcus	E. coli	Enterococcus
		colony forming units/g^-1 dry weight of peel
Control	Deep	0 a	418 d	0 a	12 c
Control	Shallow	0 a	224 d	0 a	8 c
Low	Deep	0 a	930 c	0 a	39 b
Low	Shallow	1 a	2106 b	0 a	74 b
High	Deep	0 a	3187 b	0 a	42 b
High	Shallow	0 a	11078 a	0 a	247 a

(a) In each column, values followed by the same letter are not significantly different as determined by the least square means test (𝑃≤.05; 𝑛=18). (b) Escherichia coli and Enterococcus sp. populations were transformed using logarithms to achieve normal distributions; Escherichia coli and Enterococcus sp. populations are reported in untransformed numbers.