successive years before publishing the results obtained, in connec- 

 tion with suitable conclusions. 



3. To place the entire practical management of soil and of crop, 

 before and after harvesting, in the hands of experienced tobacco 

 growers, the owners of the fields engaged in the trial. A committee 

 of officers of the Association was to visit at stated times the differ- 

 ent localities, to report on the condition and the character of the 

 crop raised. 



4. To assign to the writer as acting Director of the Massachu- 

 setts Agricultural Experiment Station the business of securing and 

 compounding the fertilizers to be used upon the different experiment 

 plats ; to measure the plats and to make subsequently a chemical 

 analysis of the crops raised. 



The observations in Hatfield by. C. L. Warner & Bro., and la 

 Agawam by Geo. D. Fisk began during the spring of 1893, while 

 those in Westfield by C. F. Fowler were deferred until the spring of 

 1894. They were each continued for three years in succession. 

 Each experiment plat occupied an area of one-twelfth of one acre 

 with from three to four feet of unoccupied space between adjoining 

 plats. The variety of tobacco selected for the trial was Havana 

 Seed. For the purpose of securing uniformity of fertilizer during 

 the years of the experiment, it was decided to purchase at once 

 as far as advisable enough of each kind to supply the needed mate- 

 rials for three years. 



Statement of Fertilizers tised upon differerit Plats. 



The fertilizer mixture used during the entire time of observation 

 contained in all cases, per acre. 



Potassium oxide, (available) 300 pounds. 



Nitrogen, (available) 100 pounds. 



Phosphoric acid, (available) 60 pounds. 



One -fourth of the nitrogen was in all cases used in the form of nitrates 



of soda or potash, to secure a uniform condition of availability of 



nitrogen during the early stage of growth. 



Chemical composition of different fertilizing ingredients iised in 

 compounding the sjjecial fertilizers for differeyit jjlats. — Ingredients 

 containing chlorine were carefidly excluded from the mixtures of fer- 

 tilizers in all cases. 



