﻿NORMAL DAYS WORK FOR VARIOUS FARM OPERATIONS. 



15 



In Tabic VI the original data for the most common widths of 

 spike-tooth harrows are tabulated by horses in the team. Adjusted 

 acreages have been computed for these widths and allowances indi- 

 cated for other widths. From an inspection of this table the daily 

 duty of any spike-tooth harrow unit and team can be readily ascer- 

 tained, as well as the limit of feasible width for the respective teams. 



Table VI. — A normal day's work viith a spike-tooth harrow, giving the average acreages 

 reported for the widths most frequently used and adjustments for other widths. 











[Net hours in the field, 9.65.1 











Width of harrow. 



On freshly plowed land. 



On well-packed land. 



Num- 

 ber of 

 horses. 



Range. 



Most 

 common 

 width. 



Har- 

 rowed 

 per 

 day. 



Number 

 averaged. 



Adjusted 

 acreage. 



Allow- 

 ance for 

 each foot 

 in width. 



Har- 

 rowed 

 per 

 day. 



Number 

 averaged. 



Adjusted 

 acreage. 



Allow- 

 ance for 

 each foot 

 in width. 



2 

 3 



4 



Feet. 

 4-12 

 8-16 



10-26 



Feet. 

 8 

 10 

 16 



Acres. 

 10.8 

 15.3 

 28.3 



224 

 149 



112 



9.50 

 13.5 

 25.0 



Acres. 

 1.2 

 1.5 



l.S 



Acres. 

 12.9 

 19.0 

 35.1 



194 

 140 

 102 



11.5 

 17.5 

 32.0 



Acres. 

 1.5 

 1.8 

 2.0 



Analysis of the data for spring-tooth harrows indicated that 49 

 per cent of farmers use two horses, 33 per cent use three horses, and 

 11 per cent use four horses. The 6-foot harrow is used by 38 per 

 cent, or twice as many as use any other width, while about equal per- 

 centages use 5, 7, and 8 foot widths, and very limited numbers use 

 any other size. Since the widths used in spring-tooth equipment 

 (Table VII) average only half that of spike-tooth harrows, it appears 

 that the draft of this type of implement on the soils where it is used 

 is twice that of the smoothing harrow on the soil where the latter is 

 found practical. The spring-tooth harrow is better adapted to 

 stony soils, where the ordinary harrow would not work well. For 

 2-horse, 3-horse, and 4-horse teams the acreage per horse decreased 

 somewhat and the acreage per foot of width increased to some 

 extent as horses were added, indicating that a width over 2 -J feet 

 per horse is generally an overload. On freshly plowed land each 

 foot in width should cover from 1.2 to 1.5 acres daily and each horse 

 could conveniently draw from 2\ to 2| feet in width and cover 3 to 3.25 

 acres. On well-packed land each foot in width could be expected 

 to cover from 1.4 to 1.7 acres daily and each horse from 3.5 to 4 

 acres. About 20 per cent less can be done on freshly plowed than 

 on well-packed soil. This is doubtless due more to the poor footing 

 and consequent high stepping, which tires the horses, than to any 

 differ ence in draft. With increasing width the daily duty of spring- 

 tooth harrows increases only half as fast as that of the spike-tooth 

 harrow. 



In Table VII the original data for the most common widths have 

 been brought together by horses in the team. The table is parallel 



