38 BULLETIN 1435, U. S. DEPARTMENT OF AGRICULTURE 
TABLE 32.—Distribution of receipts, by type of management and size of groves, 
Polk County, Fla., average 1917-1922 
Owner-operator groves Caretaker groves 
Average 
Item for all 
farms 1 to 12 13 to 24 | 25 acres 1 to6 7 to 12 13 acres 
acres acres and over acres acres and over 
INumber 0f2roves 22 ss | ee 13 12 13 12 36 14 
FARM RECEIPTS 
Crops: Dollars | Dollars | Dollars | Dollars | Dollars | Dollars | Dollars 
Graperniit-e eas ee 2, 255 1, 185 2, 781 5, 288  - 621 1, 481 3, 377 
Oranges 2222 see 3, 980 1, 889 3, 839 13, 426 1, 250 1, 694 5, 486 
“Tanferines 22 s=se0 ss ee 615 397 | 939 1, 422 58 223 1, 273 
Othersirii t= eee aes 26 18 27 80 1 16 33 
1S Loh Alar Sees ga SIS a apes 2 4 3 1 1 1 3 
@ther(cropsts= =e 38 105 59 109 20 2 3 
Increase livestock______-_________ 28 141 |. 625 erases 23 7 26 
Man labor, outside__-_------_-- 12 23 46 3 5 6 eae 
Team labor, outside_____-----___ 39 106 80 OBA) SoE Le ee ee Se 1 
Machinery work, outside_______ 6 5 25 1 fe eee eel (eee en ee ee 
Other receipts t22- 3s 15 11 7 43 8 6 8 
Rotals <= es See eee 7, 016 3, 884 7, 868 20, 487 1, 987 3, 436 10, 210 
1 Other receipts include increase in feed, rent for garage, house rent, income from bags, lumber, wood, 
ete. 
COST PER BOX 
CENTS 
350 
300 
250 
200 
150 
0 50 100 150 200 250 300 350 400 450 
YIELD PER ACRE IN BOXES (ALL FRUIT) 
Fic. 10.—Increasing yields per acre on an average are associated with decreasing costs per box. 
The cost per acre was increased with use of greater amounts of labor and material, but the 
cost per box was decreased because of greater yields 
Relationship between yield per acre and cost per box is illustrated 
in Figure 10. The graph indicates that increasing yields are asso- 
ciated with decreasing costs. The correlation between yield per 
acre and cost per box was rather high, —$0.68, indicating that a 
change in the yield of 100 boxes per acre would cause a reduction in 
the cost per box of 54 cents. This ratio of variation is constant, 
roughly, only as the yield increases or decreases 50 per cent from the 
- normal. That is, the point of diminishing returns per dollar of cost 
was reached when the average yield was 253 boxes and the cost per 
box was $1.09, As the yield increased beyond 253 boxes there was 
