﻿NORMAL DAY S WORK FOR VARIOUS FARM OPERATIONS. 



43 



(8) Since certain sizes and units of equipment are used by the 

 majority of farmers, it would be impossible by any method to secure 

 sufficient original data for the less common sizes and crews to yield 

 averages of value. In the tables, therefore, factors have been de- 

 duced for some of the less common units of equipment. These 

 deduced factors are based on an analysis of general tabulations for 

 each operation. For practical reference purposes the tables are thus 

 made complete. 



(9) In arriving at work standards by the method here used it is 

 believed that certain biased influences operate to produce averages 

 somewhat above normal. In many of the tables, therefore, compen- 

 sation has been made for the bias by reducing the adjusted factors 

 from 5 to 20 per cent below the original averages. 



(10) The daily duty for nearly all of the major operations in 

 American agriculture can be ascertained from the tables in this bul- 

 letin. These work factors represent the average of conditions in the 

 United States and can not be too strictly applied to every climate, 

 topography, or soil. 



(11) For convenient reference, averages of the data relating to 

 field implements referred to in the text have been summarized in 

 Table XLVII. 



Table XLVII. — Summary of work factors for operations with field implements. 



Operation or implement. 



Power 



unit 



(number 



of 

 horses). 



Daily 

 duty 

 per 

 foot of 

 width. 



Range of reported widths. 



Most 

 usual 

 width 



per 

 horse. 



Walking plow 



Sulky plow 



Gang plow 



Traction engine gang 



Spike-tooth harrow: 



On fresh plowing 



On well-packed land 



On fresh plowing 



On well-packed land 



On fresh plowing 



On well-packed land 



Spring-tooth harrow: 



On fresh plowing 



On well-packed land 



On fresh plowing 



On well-packed land 



On fresh plowing 



On well-packed land 



Disk harrow: 



On fresh plowing 



On well-packed land 



On fresh plowing 



On well-packed land 



On fresh plowing 



On well-packed land 



Land roller 



r 



to 60 

 horse- 

 power 



Acres. 

 1.62 

 2.00 

 1.61 

 2.13 

 2.23 

 2.08 

 2.21 

 2.20 



2.00 



1.40 

 1.60 

 1.50 

 1.80 

 1.70 

 2.00 



1.20 

 1.40 

 1.30 

 1.60 

 1.50 

 1.70 



1.10 

 1.20 

 1.20 

 1.50 

 1.60 

 1.90 

 1.60 

 1.65 

 1.75 



8 to 14 inches.. 

 10 to 16 inches 

 10 to 16 inches 

 12 to 16 inches 

 14 to 18 inches 

 18 to 28 inches 

 24 to 28 inches 

 24 to 32 inches 



4 to 30 feet 



}6 to 12 feet... 

 }s to 16 feet.... 

 |l0to26feet... 



U to 8 feet 



J5 to 10 feet.... 

 J6 to 12 feet.... 



J4 to 8 feet 



6 to 10 feet 



J6 to 10 feet 



5 to 12 feet 



5 to 12 feet 



8 to 16 feet 



Feet. 

 0.50 

 .44 

 .58 

 .44 

 .33 

 .58 

 .47 

 .39 



.33 



4.00 

 3.50 

 4.25 



3.00 

 2.33 

 2.01 



3.00 

 2.25 



2.00 



4.00 



2.00 

 2.50 



