Further Experiments on the Economic Value of Root Crops 557 



Somewhat different conditions prevailed in growing the two crops in 

 191 1. An old meadow was well manured and broken for the com crop. 

 An adjoining plat, which had grown com the year previous, was plowed only 

 in spring for mangels. Plowing for com was more expensive because 

 more difficult. The relation between cost of seed, cultivation, and har- 

 vesting for the two crops was similar to that found in 19 10. The cost per 

 acre was higher in both crops, but the cost per ton was less because of 

 better yields. The items of cost recorded for both crops for 191 1 are 

 shown below: 



At other stations. — A number of experiment stations report the cost of 

 growing mangels, but the expense items charged are not uniform in all 

 cases. More than twenty years ago Professor I. P. Roberts, who was 

 then Director of the Cornell University Agricultural Experiment Station, 

 reported the seed and labor cost of a very good crop of mangels grown on 

 manured clover sod. The yield of dry matter in that crop was not re- 

 ported. From the stations in Pennsylvania, Michigan, and Indiana, 

 reports of mangel crops are available sho^^ing cost of production, yield of 

 roots, and yield of dry matter in the roots. The Minnesota Agricultural 

 Experiment Station reports the acre cost and the yield of mangels and 

 silage com, but says nothing about the dry matter produced in these 

 crops. In order to compare these previous reports with the results 

 given in the present bulletin, the following table has been made:' 



