36 BULLETIN 1435, U. S. DEPARTMENT OF AGRICULTURE 
The yearly income from citrus growing is influenced by many 
factors most important of which are (1) yield per acre, (2) price 
received per box, (3) variety of fruit, and (4) operating cost per acre. 
The average yield per acre of bearing trees and the average price 
received is shown in Table 30 for grapefruit, oranges, and tangerines, 
Grapefruit leads in yields per acre with 189 boxes, followed by tanger- 
ines with 177 boxes, and oranges with 151 boxes for the six years. 
There was considerable variation in the average yield per acre over 
the period of the study. Grapefruit average yields varied from 120 ~ 
boxes in 1917 to 259 boxes in 1920 and there were similar variations — 
for the other fruits. The total receipts follow closely the total 
yield as will be seen by comparing the high yield years with the 
high receipts per acre years. Receipts per acre of citrus fruit is the 
most important factor directly affecting incomes since over 97 per cent 
of the receipts on these farms was from citrus fruits (Tables 31 and 32). 
There was a marked variation in the yield per acre from farm to 
farm. More farms had yields of from 151 to 200 boxes per acre 
than of any other yields, although there were several farms that had 
less than 100 and several that had over 250 boxes per acre (fig. 9). 
The most important factors affecting yields per acre were quantity 
of fertilizer used, quantity of spray material used, number of trees 
per acre, age of trees, and variety of fruit. The importance of these 
factors have already been discussed. 
TABLE 30.—Average yield per acre of bearing grove and average price received per 
bor Jet grapefruit, oranges, and tangerines, 100 farms, Polk County, Fla., 1917- 
Item 1917 1918 . 1919 1920 1921 1922 Average 
Average yield per acre: Boxes Boxes Bozes Bozes Boxes Bozes Bozes 
Grapeirnith = sas ae se 120 145 155 259 181 234 182 
Oranges: jee A a 109 134 184 194 142 146 152 
ManGeniness. see eee 132 ral 176 219 277 190 186 
Average price per box received 
by grower: Dollars | Dollars | Dollars | Dollars | Dollars | Dollars | Dollars 
Grape eat eee es 1.39 1. 84 2. 16 1.45 1. 28 1. 52 1. 61 
Oranvesaltess aoe 1. 51 3.15 2. 98 S522 156 3. 13 2. 59 
Mangeriness=-=--2 == 2.18 3. 75 4. 03 4, 22 3. 94 4. 06 3. 70 
Receipts per acre: 
Grapeimiits- see 167 267 335 376 232 356 289 
Oranges! = less 4 Sees Sk 165 422 548 625 223 457 407 
Phangeriness: #32Aee oe Me 8 288 454 709 924 1, 091 771 706 
TaBLE 31.—Average and annual distribution of receipts on 100 farms, Polk County, 
Fla., 1917-1922 
Per farm 
Source of income 
Average, 
1917 1918 1919 1920 1921 1922 1917-1922 
Dollars | Dollars | Dollars | Dollars | Dollars | Dollars | Dollars 
polal farm receipts === 2, 700 6, 011 8, 512 10, 301 5, 530 9, 044 7, 016 
rops: 
Grapefruit eae 912 1, 733 2, 550 3, 225 1, 989 3, 123 2, 255 
Oran gesaa 255s eee eee 1, 300 3, 627 5, 148 6, 170 2, 470 5, 169 3, 980 
[Dara Cres) saa a ee ieee ee 231 409 636 739 980 694 615 
Othersteuitz 2555 sa4a0es ee 33 36 33 20 18 | 19 26 
Pay se oe en 5 5 2} 1) Sa eee 2 
Othericrops2=3= ase 99 45 18 43 9 13 38 
Increase in livestoeck______-_-_-- 40 31 43 34 21.) 2 eee 28 
Man labor, outside-__-_---------- 26 21 16 1 3 2 12 
Team labor, outside____-------- 31 50 56 58 28 11 39 
Machinery work, outside-_-_-__-- 8 5 10 2 2 7 6 
Otherireceipts) = 15 49 5 8 10 6 15 
1 Other receipts include increases in feed, rent for garage, house rent, income from bags, lumber, wood, 
ete. 
