46 
BULLETIN 648, U. S. DEPARTMENT OF AGRICULTURE. 
ments and machinery. This means that in its present condition the 
equipment will have an average life of approximately six years. In- 
terest, taxes, and insurance amount to about 10 per cent of the value 
of the equipment, and repairs slightly less than half of that amount. 
PRODUCTIVE WORK UNITS. 1 
For the purpose of distributing the labor costs among the different 
crops and other enterprises by the method here used, it was necessary 
to ascertain the amount of man and work-stock labor expended on 
each. This was determined for and applied to each enterprise on each 
farm separately. The average number of days of productive labor 
required per acre of each of the principal crops is given in Table 
XVIII. Since there is a close relation between crop yields and 
amount of labor required, the average yields are also shown. 
Table XVIII. — Productive days of man and mule labor expended per acre and 
average yields of the principal crops (Brooks County, Ga.). 
Crop. 
Number 
of 
records. 
Cotton, Upland *.. 
Cotton. Sea Island a 
Corn (solid) 
Corn (planted with peanuts) a. 
Peanuts harvested (solid) 
Peanuts harvested (in corn) 
Peanuts "hogged-ofl" (solid) o . . 
Peanuts "hogged-ofl" (in corn) a . 
Oats 
Oat hay 
Rye 
Rye or oats, pastured 
Cowpea hay 
Sorghum silage 
Watermelons 
Sweet potatoes (harvested) 
Sweet potatoes (hogged-ofl) 
Irish potatoes 
Sugar cane 
143 
6 
61 
120 
15 
5 
53 
118 
80 
15 
12 
^ 
4 
46 
25 
19 
4 
24 
Average days pro- 
ductive labor per 
acre. 
Man 
labor. 
13.91 
16.39 
3.32 
2.50 
23.10 
19.43 
3.33 
1.90 
1.34 
1.50 
1.18 
.55 
1.92 
6.72 
5.36 
10.33 
5.82 
5.88 
26.24 
Mule 
labor. 
5.03 
5.20 
3.12 
2.00 
2.92 
1.10 
2.67 
1.21 
1.88 
1.70 
1.89 
1.12 
2.05 
6.80 
5.00 
4.99 
2.85 
3.82 
14.40 
Average yield per acre. 
299 pounds lint. 
214 pounds hnt. 
14.3 bushels. 
71 pounds fodder. 
12.4 bushels. 
84 pounds fodder. 
37 bushels. 
29 bushels. 
( 6 ) 
(<0 
16.2 bushels. 
831 pounds. 
7.9 bushels. 
1,092 pounds. 
14 tons. 
0.5 carload. 
108 bushels. 
69 bushels. 
307 gallons sirup. 
a Includes both wage and cropper crops. 6 0.71 bushel of seed picked, c 0.33 bushel of seed picked. 
The relationships of the various elements of cost, yields, and 
other factors to the different phases of farm organization and effi- 
ciency have already been considered elsewhere. In the following 
pages, therefore, are presented only details of costs that have not 
been previously discussed. 
1 A work unit is an average day's work. 
