The Bulletin. 



55 



Continued. 



YEARS IN FIELDS A AND B. 



tility between check plats, and a corrected check was figured on this basis for each treated 

 plat between checks. 



and potash were applied in the drill before planting. On plat 5^ and 

 11^ one-half the nitrogen was supplied as dried blood and was applied 

 with the phosphoric acid and potash before planting, and one-half the 

 nitrogen was supplied as nitrate of soda and applied about July first. 

 In plats 6^ and 12^ all of the nitrogen was furnished by nitrate of 

 soda, one-half being applied before planting, with the phosphoric 

 acid and potash and the other half about July first. On plats 7^ and 

 13-^ the nitrogen was supplied by dried blood, one-half being applied 

 before planting, with the phosphoric acid and potash and the other 

 half about July first. On plats 8 and 15 four-fifths of the nitrogen 

 was furnished by dried blood and one-fifth by nitrate of soda and was 

 all applied before planting, along with the phosphoric acid and potash. 

 While there were variations in the different years and on the two 

 fields from the two nitrogen-supplying materials and methods of 

 application, the average results for the six years show rather marked 

 uniformity in increased yields and profits. The average results are 

 so nearly the same that it can hardly be said that one material or 

 method of application has given better results than others, though 

 slightly the largest average profit was obtained from applying all of 

 the nitrogen along with the phosphoric acid and potash before plant- 

 ing, having four-fifths of it supplied as dried blood and one-fifth as 

 nitrate of soda. The additional expense of dividing the application 

 of nitrogen and applying one-half before planting and one-half later 

 is not justified by the experiments. It is to be borne in mind that 

 the soil on which these tests were made is a clay loam with a good 

 clay subsoil, and the danger of loss from leaching is very slight, if 

 any. It is quite clear from the six years' work on this soil with an 

 application of 400 pounds per acre that the most economical way of 

 applying the fertilizer is to put it all in the drill before planting the 

 crop. The results might be different on sandy loams or sandy soils. 



