Field Experiments with Fertilizers. 



325 



PlatK^ . 

 Plat N . . . 

 Plat P..., 

 Blank.... 

 Pint KN. 

 Plat KP. 

 Plat NP. . 

 Plat NPK 

 Plat S. . . . 



Potatoes per acre in 

 bushels calculated 

 from 1 40 of an acre. 



Large. 



Small. 



* For the meaning of these abbreviations and the rate at which the fertilizers were applied 

 see page 317. 



A study of the above table shows that stable manure (S) gave the 

 best results and that a complete fertilizer (NPK) gave the next best. 

 Stable manure having increased the yield of large potatoes 66.8 bu. 



Plat (KP) 



Potash 

 Phos. Acid. 



Plat (NPK) 



Nitrogeyi 



Phos. Acid Potash. 



Plat (NP) 



Nitrogen 



Phos. Acid. 



Plat (S) 

 Stable 

 Manure. 



61. — Potatoes grown and harvested by Mv. Bonnell. 



over tbe yield on the blank plat and decreased the yield of small 

 potatoes from 6.3 bu. to 5.5 bu. The complete fertilizer (NPK) 

 increased the yield over the blank plat 47.8 bu. of large potatoes 

 and decreased tlie yield of small potatoes from 6.3 bu. to 5.7 bu. 

 Of the plant-foods used alone potash gave better results than 



