22 BULLETIN 693, U. S. DEPARTMENT OF AGRICULTURE. 
Table X. — Harrowing practice (spike-tooth). 
Distict. 
Year. 
Num- 
ber of 
farm 
records. 
Acres 
har- 
rowed 
per 
farm. 
Num- 
ber of 
times 
har- 
rowed. 
Average crew. 
Hours per acre. 
Cost 
per 
Man. 
Horse. 
Man. 
Horse. 
acre. 
1914-15 
1914-15 
1915 
78 
50 
34 
18.8 
14.9 
19.9 
2.82 
2.57 
3.40 
1 
1 
1 
3.2 
2.7 
3.1 
2.02 
2.6 
2.2 
6.39 
5.50 
6.80 
$0 98 
1.04 
Idaho Falls 
1.12 
- 
The harrowing was done during the months of March, April, and 
May. Under average conditions the land was harrowed approxi- 
mately three times with implements about 10 feet in width. The 
typical crew consisted of one man and three horses. This size was given 
for 95 out of 162 estimates. A crew of one man and four horses 
was second in importance, appearing in 35 records. There were 31 
reports which contained information on the use of 1-man 2-horse 
crew. Nineteen of these were in the Provo district. In this area 
about 10 acres were considered a day's work with the spike-tooth 
harrow. The Garland growers averaged about 14 acres per day, 
while at Idaho Falls 15 acres was the average area covered in 10 
hours. Only a few farmers at Idaho Falls used the spring-tooth — 
a fact which undoubtedly accounts for the greater use of the spike- 
tooth in comparison with the Utah districts. 
Table XI. — Harrowing practice (spring-tooth). 
Year. 
Num- 
ber of 
farm 
rec- 
ords. 
Acres 
har- 
rowed 
per 
farm. 
Num- 
ber of 
times 
har- 
rowed. 
Average crew. 
Hours per acre. 
Cost 
District. 
Man. Horse. 
Man. 
Horse. 
per 
acre. 
1914-15 
1914-15 
1915 
35 
29 
7 
17.9 
11.05 
11.40 
1.60 
1.77 
1.80 
1 
1 
1 
3.48 
2.89 
3.70 
1.76 
2.50 
1.74 
6.08 
7.20 
6.30 
SO. 90 
Provo 
1.20 
Idaho Falls 
.98 
Spring- tooth harrowing was reported in 71 farm records, the 
majority of these being divided about equally between the Garland 
and Provo districts. Comparing the work done with the spring- 
tooth with that done with the spike-tooth harrow, it will be observed 
that the fields were not gone over so frequently with the spring- 
tooth. The average width of the latter was about 6J feet. Forty- 
six records gave a crew of one man and three horses. In the Garland 
area 18 reports were based upon a 1-man and 3-horse crew, while 17 
were applicable to a 1-man and 4-horse crew. Provo farmers covered 
about 7 acres per day with this type of harrow, while the Garland 
operators averaged 9 acres. 
