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BULLETIN 726, TI. S. DEPARTMENT OF AGRICULTURE. 
The leveling was clone exclusively in the spring, the operation 
preceding planting at least ten days or two weeks. The implement 
varied in width from 8 to 10 feet. To do efficient work, the leveler 
must be of suitable length and should be heavy. In the Rocky Ford 
district the leveling was done with a crew of one man and four horses 
on 84 farms; 21 farms used a crew of one man and three horses. 
One man and four horses constituted the most important crew size 
at Fort Morgan. This was also true for the Greeley area, where 146 
growers used this combination. There were 34 operators in the 
Greeley region with crews of one man and three horses. A few men 
in each of these areas used odd crews. It will be seen that the 1-4 
crew was employed on more farms than any other, indicating that 
Fig. 7. — Leveling subsequent to plowing. This operation leaves the surface of the field in a smooth 
condition, and a uniform distribution of vrater is thereby made possible. 
leveling is heavy work, demanding a strong team. Under average 
conditions an ordinary crew will level from 10 to 13 acres in a 10- 
hour day. 
HARROWING. 
Xinety-nine per cent of the growers included in this study used 
the spike-tooth harrow. The spike tooth not only has a pulverizing 
action on the soil, but it also has a slight leveling effect. On many 
farms it is customary to plow and harrow alternately from the 
beginning of the work until the entire field has been completed, 
harrowing "up to the plow' ? each night. Afterwards the beet land 
may be harrowed two, three, or more times at intervals of a week or 
10 days. The harrowing season extended from March to May. 
The harrows used varied in width from 9 to 16 feet (fig. 8). 
