38 



TABLE VI (Tabulation LXXII). Value of manure per animal unit 

 determined by comparing two groups of Chester County, Pa., 

 farms. 



{The first group contains 94 farms (one-fourth of entire number) having the least 

 number of animal units per 100 acres of crops (average, 20.36). The second group 

 includes 94 farms having the highest number of animal units per 100 acres of crops 

 (average, 56.85). Difference, 36.49 animal units 378 owner farms, Chester 

 County, Pa.] 



* Areas and prices are the averages for the entire 378 farms operated by their 

 owners. These are used hi order to eliminate factors other than the quantity of 

 manure available. The crop areas given here are per 100 acres of the five crops men- 

 tioned. 



Total of last line 624.41 



Excess of fertilizer used by second group, per 100 acres of all crops 48. 00 



Increase due to 36.49 animal units 576. 41 



Increase due to one animal unit . 15. 80 



