346 BOARD OF AGRICULTURE. - [Jan., 



The Fertilizers. — The ingredients and amounts are such as are 

 used in ordinary practice, Phosphoric acid and Potash being sup- 

 plied in about the proportions that occur in a corn crop of fifty 

 or sixty bushels, and nitrogen in one-third, two-thirds, and full 

 amount in same crop. 



Forms of Nitrogen. — The Nitrogen is supplied as Nitric Acid in 

 Nitrate of Soda; as Ammonia in Sulphate of Ammonia, and as 

 Organic Nitrogen in Dried Blood. 



Quantities of Nitrogen. — The nitrogen is applied at the rate of 

 twenty-four pounds per acre in "one-third ration"; forty-eight 

 pounds per acre in " two-thirds ration " ; and seventy-two pounds 

 per acre in "full ration."* 



Arrangements of Plots and Fertilizers. — The ingredients are sup- 

 plied as : 



Tj .. 1 ( r, T AT TO 1, 1 •* 1* ) Thus testins; the effects 



Partial ) Group!. JNos. 1—3. each by itself ( ^f ;„„,.„i:,„;f„^.„„.„..-,t„i„ 



Penilizers, ^ Grou^ 11. Nos. 4-6. Tw„ by .wo. [ ^i^-f-S^^o'r.j;,"* 



Complete 



Group III. Nos. 7 — 9- Nitrogen as nitric" 



acid in nitrate of soda. 

 Group IV. Nos. 10—12. Nitrogen as 



Nitrogen in one- 



fertilizers, j Ammonia in sulphate ot ammonia. ^ i, votir.n 



Group V. Nos. 13-15- Nitrogen as or- ^"^^ ™ion. 

 [ ganic nitrogen in dried blood. J 



The schedule (see page 348) provides for twenty plots, of which 

 two are unmanured, and eighteen supplied with the experimental 

 fertilizers. Of the latter, three, Nos. 6a, 6b, and 6c are duplicates 

 of the " Mixed Minerals," No. 6. This gives four plots of ''mixed 

 minerals," one on each side of each of the three groups, III, IV, 

 and V, in which latter the effects of nitrogen are to be tested. 



*The experiments of Mr. Bartholomew, Mr. Fairchild, and Mr. Newton 

 in 1880, described beyond, are upon a somewhat different schedule. Mr. 

 Newton's experiment of 1881 was on this schedule, as were all the others 

 begun in 1881. The differences are briefly as follows: 



In the experiments of 1881, nitrogen is supplied in group IV as anntionia, 

 and in group V as organic nitrogen, while in the experiments of 1878 and 

 1880, as may be seen in table one, the nitrogen is .supplied in group IV as 

 "nitrogen" mixture, and in group V in other forms. A further difference 

 is found in group V, which, in 1878 and 1880, supplied the nitrogen as a 

 2-3 ration, but in 1881 in varying quantities. I may add, that, as the re- 

 sult of the experience of three seasons, the arrangement of 1881 seems to 

 me very well adapted to its purpose, though some modifications, especially 

 the use of larger quantities of phosphoric acid and, in some cases, of 

 smaller quantities of nitrogen seem to me advisable. 



