In the coarse-textured soils of Michigan and the Upper Midwest, 95% of herbaceous plant roots are in the top 120 cm of soil. In planning for a new herb farm, your employer has asked you to gather data needed to estimate the plant-available water-holding capacity of the farm's soil to a depth of 1.2 m. Here are the data you have assembled, based on averaging five relatively undisturbed soil cores per measurement:

		Soil bulk density	Gravimetric water content at the indicated soil water potentials (kg water/kg soil)
Horizon	Soil depth (cm)	(g/cm3)	-25 kPa	-100 kPa	-1500 kPa	Air-dry
Ap	from 0 to 34	1.26	0.152	0.136	0.040	0.021
E	from 34 to 57	1.60	0.140	0.099	0.023	0.017
Bhs	from 57 to 90	1.59	0.216	0.177	0.095	0.050
C	from 90 to 120	1.44	0.110	0.089	0.046	0.015

If these three soil horizons are relatively uniform and these samples are representative, then please estimate how many cm of plant-available water are held in this soil to a depth of 1.2 m (that is, if the total volume of plant-available water in the three horizons were converted to an equivalent depth of free water). Hint: Think of a column of soil 1 cm² by 120 cm deep, but each soil horizon must be calculated separately and then summed.