TABLE 4.

Least-significant differences for nutrients and turbidity for soil column leachates during 18-day experiments

Variable compared	Type	Significancea
		Water-soluble nitrate	Water-soluble ammonia	Water-soluble phosphate	Total organic carbon	Turbidity (optical density at 405 nm)
Days		—b	—c	—c	—c	—c
Core type	Intact	NS	B	NS	B	B
	Disturbed	NS	A	NS	A	A
Soil type	Sandy loam	A	NS	AB	NS	A
	Silt loam	A	NS	A	NS	B
	Clay loam	B	NS	B	NS	C
Manure	Present	A	NS	NS	NS	NS
	Absent	B	NS	NS	NS	NS

^aDifferent letters indicate that differences were significant. All replicates and time points were compared by using a linear model to determine overall treatment effects. NS, not significantly different. 

^bLeachate values were generally greatest after inoculation and decreased over time. 

^cLeachate values were generally lowest after inoculation and increased over time.