AFTER CARE — FERTILIZERS 59 
less than that of any other irrigation system, 
which might be considered. The cost of a 
field equipment varies with each particular 
installation, ranging from $90 to $150 per 
acre; however, the usual cost for this equip- 
ment lies between $100 and $125 per acre. 
This figure does not include the pumping 
plant, the cost of which, together with the 
cost of the mains leading to the field, should 
be added. 
The investment is permanent, and the life 
of the system is limited only by the life of the 
pipe used to conduct the water. Owing to 
the fact that this system can be operated 
with less pressure and with less water waste 
than any other known system of this form of 
irrigation, the cost of installing a pumping 
plant is reduced to a minimum. It may be 
added also that fertilizers and fungicides in 
solution may also be distributed through 
these pipes under certain circumstances. 
