Further Experiments on the Economic Value of Root Crops 551 



harvest time, the bulk of the crop was less mature than is most desirable 

 for silage. Home-grown seed was used in the other three years. The 

 strain as locally grown is a mixture of types and tends toward seed pro- 

 duction. Eight quarts or more of seed corn are usually sown on an acre 

 and the growth of well-developed ears is thereby discouraged. In 19 10 

 the crop was allowed to mature too far for good silage while waiting for the 

 other plats and fields to become ready for silage. It was mixed with less 

 mature varieties in the silo. In 191 1 the weights and samples of corn 

 were taken five days after a killing frost that came unexpectedly on Sep- 

 tember 14. 



Comparison of corn and mangels as to yields and cost of production 



The comparative study that is here presented deals chiefly with the best 

 variety of mangels used and the most dependable variety of corn available 

 for four consecutive years. In Table i allowance is made for the compari- 

 son of yields and cost of the two crops for each of the four years. Con- 

 siderable variation in yields and costs is shown, especially in the com crop. 

 Climatic conditions are largely responsible for the variable yields of corn 

 fodder. The absence of any charge for barnyard manure is mainly respon- 

 sible for the lower acre-cost of both crops in 1908. That year the climate 

 and soil conditions favored the corn crop more than the m.angel crop; in 

 191 1 the climate and soil conditions seemed to favor the mangel crop more 

 than the com. The writer believes that the four-years averages are fair 

 to both crops. 



TABLE I. Yields, and Cost of Labor, Seed, and Fertilizers, for Four Crops 



OF Corn and of Mangels 



