156 EXPERIMENT STATION. [Jan. 



do})artment of the experiment station, and were prepared for 

 analysis in part by the fertilizer section and in part by the feed 

 and dairy section of the department of chemistry. 



The second series consisted of 76 roots, or 4 from each of 

 11 nitrogen plots before mentioned, together with 4 plots used 

 for a test of diiferent quantities of superphosphate and 4 plots 

 for different quantities of muriate of potash. These samples 

 were secured by Mr. Gaskill and the writer in ISTovember, 1910, 

 and were prepared for analysis under the supervision of the 

 latter. 



The third series consisted of 16 roots, or 4 from each of 

 4 of the nitrogen plots, and Avere gathered under the supervision 

 of Mr. G. W. Prescott on June 23, 1911, and were prepared 

 for analysis by the writer. 



All the analytical work has been based on the methods of 

 the Association of Official Agricultural Chemists,^ except where 

 departures are mentioned as necessary owing to the character 

 of the material. 



Amount of Fektilizeks applied. 

 Each plot in these tests contained one-twentieth acre and was 

 129 feet long by 16 feet lOy^, inches wide. At the time of set- 

 ting the plants the entire area received a uniform dressing of 

 the following chemical fertilizers : — 



Pounds per Acre. 



Lime, . 2,000 



Fine-f;Tound bone, . 1,000 



Nitrate of soda, . 150 



Acid phosphate, 600 



Muriate of potash, 350 



ISTo check plots without fertilizer were included in the plan. 

 The annual top-dressing was applied to the different plots in 

 the following quantities per acre : — 



1 Bulletin No. 107 Revised, Bur. of Chem., U. S. Dept. of Agr. 



