Barn and Field Experiments in 1917. 29 



Discussion of Results. 



This is designed as a long term experiment and very little 

 can be learned from a single year's results. As stated above 

 the oat yields were uneven largely because of the uneven stand 

 due to seasonal causes. The detailed plot yields of the oats and 

 straw are given in the table on page 27, and for the potatoes 

 on page 26. The results in hundredweight for the potato yields 

 are given in the triangular diagram on page 28. 



Plot 39 showed lack of vigor throughout the "season and 

 the yields from 19, 29 and 49 were smaller than expected. These 

 4 plots are nearer the woods and it may be that detailed soil 

 examinations that are to be made of all of the plots will show 

 differences in soil type. There is no apparent reason for check 

 plot 22 having the high yield that it gave. 



Grouped by the plots at the points of the triangle and by 

 the center plots the average yields are : 



Hundredweight per acre 



Three ammonia plots N3 in diagram* 157 



Five ammonia plots N5 in diagram 152 



Three available phosphoric acid plots P3 in diagram 103 



Five available phosphoric acid plots P5 in diagram 111 



Three potash plots K3 in diagram 115 



Five potash plots K5 in diagram 117 



Three center plots Comp 3 in diagram 158 



Six center plots Comp 6 in diagram 154 



Three lower center plots Am4 153 



Seven check plots 109 



The small yield from plot 39, 0-16-4, is due to other cause 

 than the fertilizer and the high yield on plot 35, 4-16-0, is doubt- 

 less due to the ammonia. Neglecting both of these does not 

 affect the yield from the phosphoric acid corner as plot 1 1, 

 0-20-0, yielded 105 hundredweight. 



The preponderance of ammonia is shown by arranging 

 the results in the order of the percentage of ammonia in the 

 fertilizer mixtures. 



*See page 21 



