112 



Barn and Field Experiments in 1916 



field was in grain. In each year 500 pounds per acre of a 4-8-7 

 fertilizer was applied to the grain. In both years this field 

 was laid out in experimental plots, involving a number of path- 

 ways. These pathways were kept culivated and it is probable 

 that a considerable residue of phosphoric acid and potash re- 

 mained in the soil. This year these plots were planted with 

 the same mixtures and handled in the same way as those in 

 Series I. The land, however, was not naturally such good po- 

 tato soil as that in Series I. The following are the results ex- 

 pressed in yields per acre of merchantable potatoes. 



Yield per Acre in No Potash Experiment With Potatoes, 

 Series II. 





Amount of Potash 



Merchantable 



Culls 



Plot No. 



Bbls. 



Bus. 



Bbls. 



Bus. 



450 



None 



119.9 



330 



5.8 



• 16 



451 



None + common salt 



120.5 



331 



3.2 



9 



452 



2 per cent 



116.9 



321 



2.9 



8 



453 



5 'per cent 



118.3 



325 



2.4 



7 



454 



8 per cent 



137.3 



378 



3.3 



9 



The yield in barrels for the two years from the three series 

 of trials are given in the following table. 



No Potash Experiment with Potatoes, ipij and ipi6. 

 Yield in Barrels per Acre. 





1915 



1916 



Average 



Amount of Potash 



' 



Series I 



Series II 





None 



110 



104 



120 



111 



None + common salt 



- 



117 



121 



119 



2 per cent 



116 



154 



117 



129 



5 per cent 



116 



154 



118 



129 



8 per cent 



120 



146 



137 



134 



