136 HATCH EXPERIMENT STATION. [Jan. 



Amount of Fertilizing Ingredients used annually per Acre. 



r Nitrogen, .... 45 pounds. 



Plats 0, 1, 2, 3, 5, 6, 8, 10, \ Phosphoric acid, ... 80 pounds. 



I Potassium oxide, . . . 125 poiinds. 



I" Nitrogen, . . . none. 



Plats 4, 7, 9, . . . ■{ Phosphoric acid, ... 80 pounds. 



I Potassium oxide, . . . 125 pounds. 



One plat, marked 0, received its main supply of phos- 

 phoric acid, potassium oxide and nitrogen in form of barn- 

 yard manure ; the latter was carefully analyzed Ijefore being 

 applied, to determine the amount required to secure, as far 

 as practicable, the desired corresponding proportion of the 

 three essential fertilizing constituents. The deficiency in 

 potassium oxide and phosphoric acid was supplied by 

 potash-magnesia sulphate and dissolved bone-black. The 

 fertilizer for this plat consisted of 800 pounds of barn-yard 

 manure, 32 pounds of potash-magnesia sulphate and 18 

 pounds of dissolved bone-black. 



The mechanical preparation of the soil, the incorporation 

 of the manurial substances, — the general character of the 

 latter being the same, — the seeding, cultivating and har- 

 vesting were carried on year after year in a like manner 

 and as far as practicable on the same day in case of every 

 plat during the same year. 



The subsequent tabular statement shows the annual appli- 

 cation and special distrilmtion of the manurial substances 

 with reference to each plat since 1889. The fertilizers were 

 in every case applied broadcast as early in the spring as 

 circumstances permitted. They were well harrowed under 

 before the seed was planted in rows by a seed drill. 



Plats 

 (One-tenth Acre) 



Annual Supply of Manurial Substances. 



Plat 0, 

 Plat 1, 



800 lbs. of barn-yard manure, 32 lbs. of potash-magnesia sulphate and 18 

 lbs. of dissolved bone-black. 



29 lbs. sodium nitrate (= 4 to 5 lbs. nitrogen), 25 lbs. muriate of potash 

 (=12 to 13 lbs. potassium oxide), and 50 lbs. dissolved bone-black 

 (:=8.6 lbs. available phosphoric acid). 



