132 STORRS AGRICULTURAL EXPERIMENT STATION. 



groups of plots thus compared are fertilized exactly alike, ex- 

 cept that the source of nitrogeu in one case is nitrate of soda 

 and in the other sulphate of ammonia, the yields from the 

 corresponding plots of the groups might be expected to cor- 

 respond somewhat more closely than is here indicated, provided 

 the fertilizers used had like beneficial action on the growth of 

 the crops. It has already been explained that the differences 

 in the experiment of igoi between the yields from plots 7 and 

 8 and those from plots 10 and 11 are very unusual, and are 

 probably due to the character of the season. The discrepancies 

 pointed out between the yields from plots 9 and 12 are quite 

 usual, however, from which it would seem that the hypothesis 

 on a preceding page that a deleterious acidity of the .soil re- 

 sulted from the use of large amounts of sulphate of ammonia 

 would seem to be reasonable. The effect of the application of 

 lime for the correction of this acidit}^ of the soil may be seen 

 by comparing the results tabulated below. 



Table 67. 



Comparison of yields of corn and stover from sections with and 



without lime. 



From the results summarized in the table above it will be 

 seen that while the yield from section of plot 12 with the 

 largest quantity of nitrogen in sulphate of ammonia was smaller 

 than that from plot 9 with the same quantity of nitrogen in 

 nitrate of soda, the yield from section A of plot 12, upon which 

 the lime was applied, was larger than that from the corre- 

 sponding section of plot 9, also with the lime. This would 



