4 BULLETIN 412, U. S, DEPjiETMENT, OF AGRICULTURE. 



In Table III is shown th^Q djitj^ of p^lky plows in western New York 

 working on sod and on stubble. Few New York farmers attempt to 

 operate sulky plows with two borses. Tbe load is entirely too great 

 for two horses, and only poor plowing can be done with less than 

 three horses. The 14-inch plow is most commonly used on the 

 sulky in this section, while the 16-uich is the most common for the 

 average of aU. farmers in the country. In the soils of New York the 

 14-inch sulky is an ample load for three horses. From 5 to 10 per 

 cent more work can be done on stubble than on sod with the sulky 

 plow. 



Table III. — A fair day's work for sulky plows drawn by three horses on sod and on stubble. 



Horses. 



Width. 



On sod. 



On stubble. 



Acres. 



Number 

 averaged. 



Acres. 



Number 

 averaged. 



3 

 3 

 3 



Inches. 

 12 

 14 

 16 



1.95 



2.08 

 2.26 



86 

 10.5 

 51 



2.11 

 2.20 

 2.37 



86 



115 



42 



HARROWING. 



The spike-tooth or smoothing harrow can be operated with 

 2-horse or 3-horse teams in a wide range of widths, as it is an imple- 

 ment of comparatively hght draft. Three horses accomphsh from. 

 10 to 15 per cent more work on the same width of harrow than two 

 horses do. Table IV gives the average duty for the spike-tooth 

 harrow for widths ranging from 5 to 12 feet for 2-horse and 3-horse 

 teams. 



Table IV. — -A fair day's ivorkfor the spike-tooth harrow vnth 2-horse and 3-horse teams. 



Width. 



2-borse teams. 



3-horse teams. 



Acres. 



Number, 

 averaged. 



Acres. 



Number 

 averaged. 



Feet. 

 5 

 6 

 7 

 , 8 

 9 

 10 

 12 



11.2 

 11.1 

 12.0 

 13.0 



13.8 

 16.1 

 14.8 



15 



87 

 102 

 199 



43 

 102 



20 



11.0 

 11.9 

 13.2 

 14.1 

 16.4 

 17.3 

 19.1 



2 



27 

 33 



75 

 48 

 80 

 38 



Where two horses are required to draw widths greater than 10 

 feet they appear to be overloaded so that their daily efficiency is 

 reduced. 



The spring-tooth harrow is used to do the hard, preliminary work 

 of fitting the land after plowing. It is adapted to soils which are too 



