EXPEEIMENTS WITH POTATOES 



117 



was used in each, the increase was 101 bushels of marketable, 

 or 108 bushels large and small, in favor of the plot containing 

 the barnyard manure. 



Where a larger amount than the above of commercial fertili- 

 zer was used the difference was not as great nor was the yield as 

 good. 



Fig 4.— Early Rose Potato No. 23. 



Drawing conclusions from this experiment it is evident that 

 where the conditions are the same as above named, if an appli- 

 cation of 15 cords of barnyard manure in addition to the cus- 

 tomary application of commercial fertilizer for potatoes is used,, 

 the increased yield will be at least 100 bushels of marketable 

 potatoes. 



Another thing not to be lost sight of also is the better condi- 

 tion of the soil for succeeding crops which manure is responsi- 

 ble for. 



EXPEKIMENT VI. 



Comparative results from plowing in and harrowing in 

 barnyard manure. 



An elaborate experiment was planned for carrying out this 

 test. The plots used were similar in every respect to those of 

 Experiment V, being located in the same field and in every way 

 the same other than the above named culture. 



The following table shows the results both of individual plots 

 and their comparative total yield and averages. 



