1917.] PUBLIC DOCUMENT — No. 31. 69a 



The grinding of both straw and seed in preparation for this 

 work was done by student help. Forty of the samples of millet 

 straw and seed were later tested in duplicate for nitrogen and 

 potash, 19 for nitrogen and phosphoric acid, 12 for nitrogen, 

 phosphoric acid and potash, and 42 for nitrogen alone. 



Forty-eight samples of subsoil, collected in various sections 

 of the State, have been tested for their acid soluble potash; 

 complete mechanical analyses were also made on these samples. 



Four hundred and ninety-three different substances have 

 been received and analyzed for farmers, farmers' organizations 

 and the various departments of the experiment station : — 



Fertilizers and by-products used as fertilizers, ....'. 197 



Lime products, 20 



Soils for lime requirement and organic-matter tests, . . . 220 



Soils for complete analysis, 2 



Soils for partial analysis, 28 



Tobacco, onion and greenhouse soils, special analysis of water- 

 soluble constituents, 23 



Miscellaneous, 3 



493 



The usual interest and co-operation has been taken in the 

 activities of the Association of Official Agricultural Chemists. 

 Mr. Haskins has served as referee on nitrogen for the year, 

 planning the work, preparing and forwarding samples for 

 analysis, and compiling the final report on this subject for the 

 association. 



(d) Vegetation Tests. 

 In 1913 an experiment was begun to study the availability of 

 phosphoric acid in basic slag phosphate by means of vegeta- 

 tion tests. This work was in co-operation with the basic slag 

 committee of the Association of Official Agricultural Chemists. 

 The preliminary work on this field during 1913, 1914 and 1915 

 was confined to a systematic management and cropping, in- 

 tended to deplete the phosphoric acid in the soil. The final 

 tests w^ere made during the past year, and included a study 

 of the effect of different phosphoric acid compounds on 42 plots, 

 each having an area of one-eightieth of an acre, rape being the 



