METHODS OF APPLYING MANURE. 



47 



Table V shows the rainfall in inches in each of the months of what 

 may be called the growing season, together with the total for the several 

 years. A study of the figures for the several months in the different 

 years and the totals for these years has not sufficed to indicate any well- 

 defined relation between rainfall and the relative standing of N and S. 

 This, perhaps, is not surprising, because conditions affecting the amount 

 of evaporation or loss of moisture from the land surface vary very widely 

 in different years, especially important in this connection being the 

 amount of sunshine, the mean temperature and the direction and amount 

 of wind movement. The fact is we do not know them with sufficient 

 accuracy to determine whether variations in local climate were sufficient 

 to account for the differing results in the different years during which 

 the experiment continued or to enable us to judge how important these 

 clim^atic variations may have been. 



