TABLE 3.

Parameter estimates from the zero-order kinetics model^a of the steep part of the degradation curves and calculated DT₅₀ values

Soil	MCPA (mg/kg)	R2	k0 (% × day−1)	DT50 (days)
Topsoil	2.3	0.990	−2.75	16.2
Topsoil	20	0.941	−1.83	33
Subsoil	2.3	0.711	−1.45	37

^aSee equation 1.