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BULLETIN 3, U. S. DEPAKTMENT OP AGEICULTUKE. 



the daily duty is readily found by subtracting from 1.80, the allow- 

 ance, 0.12 acre, multiplied by the difference between 9 and 6, giving 

 a work factor of 1.44 acres. 



Table II. — A normal day's work with a walking plow, giving the daily acreages reported 

 at 6-inch depths for each width, adjustments for these widths, and a scale of allowances 

 for other depths. 



[Net hours in the field, 9.65.] 



Team and width. 



Plowed 

 per day. 



Number 



Adjusted 

 acreage. 



Allow- 

 ance per 

 inch in 

 depth. 



Prac- 

 ticable 

 depths. 



Two-horse teams: 

 8 inches 



10 inches 



11 inches 



12 inches 



14 inches 



lfi inches 



Three-horse teams: 

 8 inches 



10 inches ...... 



11 inches 



12 inches 



14 inches 



16 inches 



Acres. 

 1.69 

 1.62 

 1.67 

 1.76 

 2.00 

 2.11 



1.50 

 2.10 

 - 1.50 

 2.40 

 2.32 

 2.77 



18 

 64 

 19 

 143 

 151 

 22 



1 



5 

 2 

 10 



38 

 65 



1.50 

 1.60 

 1.65 

 1.70 

 1.80 

 1.90 



1.70 

 1.90 

 2.00 

 2.10 

 2.30 

 2.50 



Acres. 

 

 

 



.10 

 .12 



Inches. 

 3 to 12 

 3 to 12 

 3 to 12 

 3 to 10 

 3 to 9 

 3 to 8 



3 to 12 

 3 to 12 

 3 to 12 

 3 to 11 

 3 to 10 

 3 to 9 



From the tabulation of 1,056 reports on sulky plows it appears 

 that that implement is not in such general use as the walking plow, 

 only half as many of this type being reported. A considerable 

 number reported the 18-inch width, while the 12, 14, and 16 inch 

 widths are the most popular. A 16-inch sulky is used by 57 per 

 cent, the 14-inch by 23 per cent, while only 20 per cent use other 

 widths. As in the case of the walking plow, there was concentration 

 on the 6-inch depth, the percentage for which was the same for both 

 walking and sulky plows, while for depths greater than 6 inches the 

 sulky plows show a smaller percentage than the walking plows. 

 Of those reporting, only 12 per cent plow at depths other than 4, 5, 

 6, 7, 8, and 9 inches with this implement. It was also found that 

 76 per cent of sulky plows are drawn by three horses and 10 per cent 

 by four horses. The draft of the implement is so great that only 12 

 per cent of the users attempt to operate it with two horses. The 

 sulky plow is used for cutting wider furrows, but not for such deep 

 plowing as is the walking plow. 



When the data for sulky plows were grouped by widths with the 

 depths averaged it was seen that the acreage plowed increased 

 as the width increased and that heavier horses were used on the 

 greater widths. The average load required of each 1,000 pounds of 

 horse was 34 square inches for 2-horse teams, 25 square inches for 

 3-horse teams, and 21 square inches for 4-horse teams. The respec- 

 tive acreages plowed by these teams per 1,000 pounds of horse was 

 0.71, 0.72, and 0.64. A team of two horses is necessarily overloaded 

 by a sulky plow, and four horses are not economical except on very 

 hard or unsubdued land. 



