Given a loamy soil with an average apparent specific gravity of 1.5, an available water holding capacity of 12.0 percent (volume basis), and a field capacity of 21.0 percent (volume basis). 

Volumetric Depth of sample Soil Moisture Cm % 12.0 15.0 0-30 30-60 60-90 17.0 

a. Calculate the soil moisture depletion in each soil depth increment. 

b. What is the average soil moisture in soil profile (percent, volume basis)? 

c. What is the approximate soil moisture "tension'" in each soil depth? 

d. How much water must be added to bring the soil profile to field capacity?