921 



was prncticallj^ the same in the cioi^s from all the subplats, but that 

 the i>('i(;entage of potash and nitrogen differed widely according to the 

 way in which the plats were manured. The following table shows the 

 results for the crop grown on the eight subdivisions of J plat: 



Analyses of summer wheat grown ivith different fertilizera. 



Fertilizers applied. 



No. 1, potash 



No. 2, iiitrofien 



No. a, plio.sphorio acid 



No. 4, pota.sh, nitrogen, and phosphoric acid 



No. 5, unfertilized 



No. 6, ]i(it:isli ;ind nitrojjen 



No. 7, potash and phosphoric acid 



No. 8, nitrogen and phosphoric acid 



The crop contained, in dry 

 matter — 



Nitrogen. 



Per cent. 

 1.84 

 2.25 

 1.85 

 1.99 

 1.71 



2. on 



1.68 

 1.89 



Plios- 

 phoric 

 acid. 



Per cent. 

 0.81 

 0.82 

 0.82 

 0.91 

 0.85 

 0.89 

 0.74 

 0.82 



Potash . 



Per cent. 

 3.64 

 2.99 

 3.03 

 4.41 

 2.84 

 4.14 

 3.24 

 2.64 



The results indicate that the soil contained sufficient phosphoric acid 

 the percentage of this ingredient in the plants showing no increase 

 from the addition of phosphoric acid to the soil. The percentage of 

 nitrogen and potash it will be seen increased with the addition of these 

 materials to the soil. 



From the results of this experiment the author concludes that plant 

 analysis in connection with fertilizer experiments furnishes indications 

 whether or not a soil is deficient in one or more of the essential ingre- 

 dients. If the percentage of an ingredient in the ash of the crop is 

 increased by the addition of this ingredient to the soil, the conclusion 

 is that the supply of this ingredient in the soil in available form is 

 insufficient, and that therefore it should be applied in the fertilizer. 

 If, on the contrary, the percentage is not increased by the addition of 

 this ingredient to the soil the conclusion is that the soil is already rela- 

 tively rich in this ingredient. 



Concerning the details of the method, for instance as to whether 

 the whole or a i)art of the plant should be analyzed, what stage 

 of growth is best adapted for the purpose, etc., further investigations 

 are to be made. At present the author is inclined to recommend the 

 analysis of the whole plant at the time of blooming. It is hoped by 

 similar experiments on other soils to work out a simple method for 

 determining the fertilizer requirements of soils. 



Effect of nitrogenous manures on the structure and nitrogen 

 content of barley, C. Kraus {Zeitsch. ges. Brauwcsens, 1S92, p. 105; 

 ahs. in Cliem. Ztg., 1892, rep. p. 127). — The same variety of barley was 

 grown on plats which had received various kinds and amounts of nitrog- 

 enous fertilizers, but which otherwise were treated uniformly. The 

 protein content of the barley raised ranged from 12.23 to 14.83 per 

 cent. The richer the nitrogenous manuring the higher the percentages 



