1895.] PUBLIC DOCUMENT — No. 33. 213 



3. Field Experiments to ascertain the Influence of 

 Different Mixtures of Commercial Fertilizers 

 ON THE Yield and General Character of Sev- 

 eral Prominent Garden Crops. 



Field C. 



The area devoted to the above-stated experiment is 198 

 feet long and 183 feet wide ; it is subdivided into six plats 

 of uniform size (89^ by 0)2 feet, or about one-eighth of an 

 acre each). The plats are separated from each other and 

 from the adjoining cultivated fields by a space of five feet 

 of unmanured and unseeded yet cultivated land. They are 

 arranged in two parallel rows, running from west to east. 

 Nos. 1, 2 and 3 are along the north side of the field, begin- 

 ning with No. 1 at its west end, while plats Nos. 4, 5 and G 

 are located along its south side, beginning with Plat 4 on the 

 west end. The soil is several feet deep, and consists of a 

 light, somewhat gravelly loam, and was in a fair state of 

 productiveness when assigned for the experiment here under 

 consideration. 



The entire field occupied by the experiment is nearly on 

 a level. Its earlier history can be learned from previous 

 annual reports. 



The observation with raising garden crops, by the aid of 

 different mixtures of commercial manurial substances here 

 under special consideration, began upon plats Nos. 4, 5 and 

 6 during the spring of 1891, and upon plats Nos. 1, 2 and 3 

 during that of 1892. The difference of the fertilizers applied 

 consisted in the circumstance that clifierent forms of nitro- 

 gen and potash were used for their preparation. All plats 

 received essentially the same quantity of nitrogen, potash 

 and phosphoric acid, and every one of them received its 

 phosphoric acid addition in the same form, namely, dis- 

 solved bone-black. Some plats received their nitrogen sup- 

 ply in the form of organic animal matter, dried blood ; 

 others in the form of sodium nitrate, Chili saltpetre ; others 

 in the form of ammonium sulphate. Some plats received 



