TESTS AT STATRSBORO, GA. 63 



It is interesting to note in this connection that the variety Mosby 

 Prohfic is farthest from home, that it has been carried to a more 

 radically different soil than any of the other varieties, and that it 

 is ranked lowest in yield and failed to give a practical cross. Cocke 

 Prolific is the next farthest from home, ranks third from the bottom 

 of the list, and was impractical for crossing with either Marlboro 

 Prolific or Rodgers White Dent. The Williamson corn ranks next 

 to Mosby Prolific; as it had been given considerable selection at 

 home for years, it is reasonable to suppose that its low yield is due 

 to poor adaptation. 



It is thus seen that three out of the four varieties that were imprac- 

 tical as crosses with either of the two sires were also poorly adapted 

 to the conditions at Statesboro. The Tindal variety again stands 

 out as an exception. 



INFLUENCE OF SEASONAL DIFFERENCES. 



In 1909, while the crosses for this test were being grown, a careful 

 comparison of the varieties was made. The season was different 

 from that of 1910, and the effect is clearly shown by the ranking 

 obtained at that time. 



The ranking for 1909 was: 



First Tindal. 



Second Station Yellow. 



Third Native of Statesboro. 



Fourth Rodgers White Dent. 



Fifth Marlboro Prolific. 



Sixth Williamson. 



Seventh Mosby Prolific. 



Eighth Aldrich Perfection. 



Ninth Cocke Prolific. 



Tenth Sanders Prolific. 



Apparently the difference between the two seasons has resulted in 

 changing Sanders Prolific from last to first in rank and Aldrich Per- 

 fection from eighth to second. The first year less difference in pro- 

 duction was shown between the two sire varieties than was shown 

 the second year. In 1909 Mosby Prolific (poorest in 1910) ranked 

 better than Aldrich Perfection (second in 1910). Tindal ranked high 

 both years. 



The differences showai by the two tests are radical, but hardly more 

 than is frequently found in variety tests of more than one year. 



If, as has been previously indicated, there is usually a relation 

 between high yield and adaptation and the advantageous crossing of 

 corn, then it would seem that seasonal differences may play an 

 important part. 



INFERENCES DRAWN FROM THE FOREGOING DATA. 



From these tests it would seem that the productivity of first- 

 generation crosses is usually correlated to the productivity of the 

 parent varieties, and the yield of the parent varieties is largely 

 dependent upon their adaptation to the location and the season during 

 which the test is made. 



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