1896.] PUBLIC DOCUxAIENT — No. 33. 117 



gen addition, as compared with those receiving a nitrogen 

 supply, was during succeeding years as follows : — 



With corn in 1889, one-fifth less. 



With oats in 1890, one-fifth to one-sixth less. 



W'ith rye in 1891, one-fifth to one-sixth less. 



With soja bean in 1892, one-third to one-fourth less. 



With oats in 1893, one seventh to one-eighth less. 



From these results it appeared that the introduction of a 

 leguminous crop into our rotation had somewhat reduced the 

 diflerence in yield between the plats receiving no nitrogen 

 and those receiving it, yet had not entirely obliterated it. 

 It was decided to continue the observation by repeating the 

 raising of soja beans in 1894 and oats in 1895. 



1894. — To secure, if possible, more decisive results re- 

 garding the presence and absence of available nitrogen, it 

 was decided to use twice the amount of phosphoric acid and 

 potassium oxide, as compared with preceding years. 



Amount of Fertilizing Ingredients applied per Acre during 1894. 



{ Nitrogen, .... 45 pounds. 



160 povinds. 

 250 povinds. 



Plats 0, 1, 2, 3, 6, 6, 8, 10, <" Phosphoric acid, 

 \^ Potassium oxide, 



( Nitrogen, 

 Plats 4, 7, 9, . . .-! Phosphoric acid, 

 [Potassium, oxide, 



none. 

 160 pounds. 

 250 pounds. 



An early-maturing variety of soja bean was selected for 

 the experiments. The fertilizer mixtures were applied as 

 in previous years, broadcast, in the middle of April. 



After proper preparation of the soil the soja beans were 

 planted on May 12 in drills two and one-half feet apart, 6 

 pounds of seed being used per plat, or GO pounds per acre. 

 The plants appeared above ground May 21 ; June 5 the 

 field was cultivated and hoed, and also on the 16th, 25th 

 and July 12. 



The plants began to bloom July 25. Owing to the pro- 

 tracted drought of July and August, the crop did not get 

 that fulness of growth which might have been olitained under 

 more favorable conditions. The crop was cut August 28. 



