other production costs where records had not been kept showing the respective
charges to different crops. Prorations were also made to these items on the
basis of available data (D.L. Brooke, Fla. Agri. Exp. Sta. Bul. 660, June
1973).

In many cases individual growers did not incur every cost item. This applies
especially to airplane application, machine hire, grading and packing,
containers, hauling and precooling. Thus, these data are based only on the
overall average for all growers contacted in each area.

Per-unit costs and returns were computed by dividing the average yield per
acre in the sample into the various items of cost shown in the individual
tables. They are merely averages of the data recorded and, in some cases, do
not reflect the full cost of performing the service because all growers may
not have incurred every item of cost.