1919.] PUBLIC DOCUMENT — No. 31. 31a 



by farmers. During the winter months the usual co-operative 

 analytical work has been accomplished for the agricultural 

 department to complete studies both in the field and in pots. 

 This work may be summarized briefly as follows: — 



Dry matter and nitrogen determinations and complete ash analysis in 



duplicate on 5 samples of corn grain and 5 samples of corn stover. 

 Dry matter, nitrogen, potassium oxide and sodium oxide determinations 



in duplicate on 5 samples of corn cob. 

 Dry matter and nitrogen determinations and ash analysis in duplicate 



on IS samples of cabbage. 

 Dry matter determinations on 7 samples of cabbage. 

 Dry matter, nitrogen and potassium oxide determinations in duplicate 



on 10 samples of strawberries. 

 Weights and dry matter determinations on 264 samples each of millet 



seed and straw. 

 Weights, dry matter and duplicate nitrogen determinations on 57 samples 



each of millet seed and straw. 

 Weights, dry matter, nitrogen and potassium oxide determinations in 



duplicate on 60 samples of miUet seed and straw. 

 Weights, dry matter, nitrogen, potassium oxide and phosphoric acid 



determinations in duplicate on 12 samples each of millet seed and 



straw. 

 Weights, dry matter, nitrogen and phosphoric acid determinations in 



duplicate on 12 samples of millet seed and straw. 



Two hundred and seventy-four different substances have 

 been received and analyzed for farmers and various depart- 

 ments of the experiment station, and may be grouped as 

 follows: — 



Fertilizers and fertilizer by-products, ...... 149 



Lime products, ......... 3 



Soils for lime requirements and organic matter tests, . . . 122 



274 



(d) Vegetation Tests. 



A pot experiment has been conducted with millet, compris- 

 ing 12 pots, to study the effect of a mixture of peat, phosphate 

 rock and lime treated with bacteria by a patented process. 



A field experiment with corn, comprising 15 one-fortieth 

 acre plots, has been conducted to study the value of a ground 

 rock known as Nature's Plant Food, and also a mixture of 



