1903,] PUBLIC DOCUMENT — No. 38. 105 



out is the injury to young clover in a cold, wet spring, due 

 to potash salts containing chlorine, especially to the kainite. 



VI. — To determine the relative value of phosphates 

 used in quantities furnishing equal phosi)horic acid to each 

 plot. The crop of this year was onions ; and the phos- 

 phates giving the best results, and the only ones which can 

 be considered even fairly satisfactory, in the order of their 

 rank, are : dissolved bono meal, fine-ground raw bone, 

 phosphatic slag, and the steamed bone meal. Two gave 

 results ver}^ much inferior to all others, viz., Tennessee 

 phosphate and Florida soft phosphate. 



VII. — A. Soil test with corn. The results of this year 

 indicate that potash to a far greater extent than any other 

 plant-food element controls the yield of corn. Mmnate of 

 potash alone at the rate of 1(50 pounds per acre annuallj'for 

 fourteen years gives this year a yield at the rate of 47.7 

 bushels of shelled grain per acre. The combination of 

 dissolved bone-black with the same amount of muriate of 

 potash gives a crop of 55.9 bushels of shelled grain per 

 acre. B. Soil test with potatoes. The results of the 

 year indicate that the muriate of potash on the limed por- 

 tion of the field increased the crop more than either of the 

 other fertilizer elements ; but the potato crop is increased 

 to a considerably greater extent by the use of materials 

 furnishing phosphoric acid and nitrogen than was the corn 

 in the other soil test. 



VIII. — To determine the relative value for the produc- 

 tion of corn and mixed grass and clover in rotation of a 

 large application of manure, as compared with a smaller 

 application of manure in connection with a potash salt. 

 The crop of this ycn.v was mixed grass and clover. The 

 manure alone gave crops somewhat larger than the com- 

 bined manure and potash, but, owing to the lesser cost of 

 the combination, the financial result is in its favor. 



IX. — To determine the relative value for crop production 

 of two fertilizer mixtures, one furnishing the important 

 elements of plant food in the same proportion in which 

 thev are found in the average of corn fertilizers otlered in 

 our markets, the other containing less phosphoric acid and 



