BIENNIAL REPORT, HCJ7 AND 1928 



323 



Fertilizer and Plant Food Tonnage 



Full details of the fertilizer inspection work may be found in Bulletin 

 No. 45, Control Series, published in December, 1928. 



Miscellaneous analytical work. (H. D. Haskins, H. R. DeRose, M. W. 

 Goodwin). During the period from November 1, 1927, to April 1, 1928, 

 the usual amount of cooperative chemical work wa.s done on problems of 

 other departments of the institution. Its general nature is shown from 

 the following summary; 



29 samples of tobacco stalks, partial ash analysis 

 3 samples tobacco leaves, for partial ash analysis 



30 samples timothy decoction residues: dry matter, ash and nitrogen 

 36 samples timothy decoction: total, ainmoniacal and nitric nitrogen, 



and testing for organic toxins. 

 207 samples millet: dry matter and nitrogen 

 29 samples processed organic ammoniates: total, insoluble, ammoni- 

 acal and nitric nitrogen, insoluble nitrogen activity tests, total 

 phosphoric acid. 

 10 samples timothy cover crop for partial ash analysis 



The department has also made the following analyses for institutional 

 departments, farmers, and farm service organizations: fertilizers 42, soils 

 12, manures 3, lime products 3. For this service, outside of departmental 

 work, the Experiment Station receives compensation. 



In addition to this, the department has performed the usual cooperative 

 work with referees of the Association of Official Agricultural Chemi.sts on 

 studying new and existing methods of analysis. 



Vegetation Pot Experiment — Season of 1928. (H. D. Haskins and 

 A. B. Beaumont). This experiment, comprising 131 pots, was conducted 

 in the study of the nitrogen availability of low grade organic substances 

 high in nitrogen which have gradually replaced animal tankage and fish, 

 formerly largely used in mixed fertilizers. Results are reported in Control 

 Bulletin 45. 



