FLOWER BUDS OF APPLES 281 



5, cover crop, formed no flower buds at all, and in two collec 

 tions from plot 2 cover crop and in one collection from clean 

 tillage all buds were leaf buds. According to the measurements 

 flower buds formed earliest and led in development on sod 

 the blooming period on plot 6 clover sod. On the remaining 

 plots the flower buds formed slightly earlier and were slightly 

 more advanced up till April 10 on the blue grass sod. These 

 tables are in accord with those of the Jonathan showing that the 

 flower buds formed earliest and lead in development on sod 

 and also that there are two periods at which growth is mort- 

 rapid. It should 'be noted, however, that in contrast to tht 

 JonatJian which formed flowers earliest on plot 1, the Grimes 

 Golden on plot 6 formed flowers earliest. This shows that 

 there is some other factor which is as potent as soil management 

 in its effects on the time of the formation of flower buds. 



The formation of sporogenous tissue began about November 

 13 and continued until Februaiy 19. The mother cellg of the 

 anthers began to form al30ut April flrst. The order of the forma- 

 tion of sporogenous tissue in the different trees was as follows: 



Qrimes Golden, blue grass sod. 



J'onathan, blue grass sod. 



Grimes Golden, clover sod, plot six. 



Jonathan, clover sod, plot one. 



Grimes Golden, clover sod, plot one. 



Grimes Golden, clean tillage. 



Grimes Golden, cover crop, plot two. 



Jonathan, clover sod, plot six. 



Jonathan, cover crop^ plot five. 



Jonathan, clean tillage, plot three. 



Jonathan, cover crop, plot two. 



With the exception of the Jonathan on clover soil, plot 6, the 

 sporogenous tissue appeared earliest on the sod plots. 



From a study of the slides it was ascertained that the forma- 

 tion of flowei*s for the two varieties of trees took place in the 

 various plots in the order as shown below. 



Jonathan Grimes Golden 



1. Clover sod. Plot one. 1. Clover sod. Plot six. 



2. Blue grass sod. 2. Blue grass sod. 



3. Clover sod. Plot six. 3. Clover sod. Plot one. 



4. Cover crop. Plot five. 4. Cover crop. Plot two. 



5. Clean tillaje. 5. Clean tillage. 



6. Cover crop. Plot two. 6. Cover crop. Plot five (no flowers) 

 The number of flower buds in each collection was recorded 



and from these data the percentages of flower buds formed by 



