THIRTEENTH ANNUAL YEAR BOOK— PART XII 679 



Fig. 18. — Showing- second cutting- of alfalfa ; - 1 at Ames, 



July. 17. Total yield of field cured hay from three cuttings during the 

 season, 7.24 tons. 



are not available. During the spring and late summer of 1908 a num- 

 ber of new seedings were made so that during the years 1909, 10 and 11, 

 eleven plots were under observation. The average yields from these 

 plots was 4.92 tons per acre in 1909, 4.28 in 1910, and 3.68 in 1911. 



It will be observed that the average yield increased considerably dur- 

 ing the three years; nearly half a ton per acre. This is no doubt partially 

 due to the fact that the rainfall for 1911 was very light and that of 1910 

 considerably below the average. It is also true, however, that on some 

 cf the plots the blue grass made serious inroads, as most of these plots 

 received no cultivation, 



TABLE XVI. 

 Yield of Field Cured Alfalfa Hay in 19Ci> ard 1&.^3 on 5 Plots at Ames. 



'Plowed in April, 1908. 



