248 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Each box received a fertilizer mixture of its own, nothing 

 but commercial fertilizers and chemicals which had been 

 carefully analyzed being used in their compounding. The 

 amount of potassium oxide, phosphoric acid and nitrogen 

 was the same in each case, the phosphoric acid in all cases 

 being supplied by dissolved bone-black, while the potassium 

 oxide in some cases was in the form of muriate of potash 

 (I., II. and III.), in others of high-grade sulphate (lY., Y. 

 and VL), and in the remainder (VII., VIII. and IX.) by 

 potash-magnesia sulphate. The nitrogen was supplied in 

 the form of sulphate of ammonia (II., IV. and VII), nitrate 

 of soda (I., V. and VIII.) and dried blood (III., VI. and 

 IX) . These fertilizer mixtures were thoroughly incorporated 

 with the soil. Each box was planted in part with lettuce 

 and in part with New Zealand spinach. The same lot of 

 seed sufficed for the whole, and the seeding took place on 

 the same day. Throughout the growing period the boxes 

 were treated similarly, as far as temperature and time and 

 amount of waterinn: were concerned. 



The relative proportion of fertilizer applied was : of potas- 

 sium oxide, 3 parts ; of phosphoric acid, 1 part ; and of 

 nitrogen, 1 part. The percentage of the different ingredients 

 added to the soil was as follows : — 



Per Cent. 



Potassium oxide, , .00026 



Phosphoric acid, 00009 



Nitrogen, 00009 



Fertilizer 

 Box I. 

 90 grams muriate of potash. 

 100 grams dissolved bone-black. 

 100 grams nitrate of soda. 



Box 11. 

 90 grams muriate of potash. 

 100 grams dissolved bone-black. 

 100 grams sulphate of ammonia. 



Box III. 

 90 grams mui'iate of potash. 

 100 grams dissolved bone-black. 

 140 srrams dried blood. 



Mixtures used. 



Box IV. 

 90 grams sulphate of jiotash. 

 100 grams dissolved bone-black. 

 75 grams sulphate of ammonia. 



Box V. 

 90 grams sulphate of potash. 

 100 grams dissolved bone-black. 

 100 grams nitrate of soda. 



Box VL 

 90 grams sulphate of potash. 

 100 grams dissolved bone-black. 

 1 iO grams dried blood. 



