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IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



tlie two varieties on plots in sod and in cultivation were deter- 

 mined. The percentages are recorded in Taible V and show witli 

 some exceptions that the percentages of flower buds were higher 

 on sod. 



TABLE V. PERCENTAGES OF FRUiT BUDS. 



SOIL MOISTURE CONSIDERED IN REFERENCE TO THE FORMA- 

 TION AND DEVELOPMENT OF FRUIT BUDS IN THE 

 JONATHANS. 



Determinations of soil moisture iuade at different places show 

 that there is considerable difference in the amount of soil mois- 

 ture in different regions of the same plot. It so happened, 

 however, that determinations ^vere made within a few feet of 

 the Jonathans during the summer of 1916. The results of these 

 determinations are given in Table VI and are interesting when 

 considered in connection Avith the formation and development of 

 flower buds. It will be observed that the sod plots, 1 and 4, 

 which are the plots where flower buds formed earliest and most 

 abmidantly, had the lowest percentage of soil moisture. Also 

 on plot 6 where flower buds formed later than on plot 1 the 

 percentage of soil moisture was relatively high. Thus on the 

 plots where the soil moisture was low, the flower buds formed 

 earliest and also mo.st abundantly with the exception of the 

 Jonathan on olot 5. 



