18 



CIRCULAR 5 7 9, U. S. DEPARTMENT OF AGRICULTURE 



23 

 22 

 21 



20 _ 

 ' 19 



SOFTENING ON TREE ***** 



15 

 OCT. 



15 

 NOV 



15 

 CEC 



15 

 JAN 



FEB. 



15 



31 



15 



30 



15 



31 



15 



30 



MAR. 





APR. 





MAY 





JUNE 





Figure 14. — Firmness (pressure test) of Yellow Newtown (Albemarle Pippin) ap- 

 ples in relation to stage of ripeness during ripening at various temperatures. 

 The letters on the chart indicate the degree of ripeness, as explained on page 5. 

 The range of firmness or zone representative of each degree of ripeness is given 

 at the right. The letters are omitted from those points at which the desig- 

 nations fall within the corresponding zone at the right, as explained on pages 

 5 and 6. 



a. 



SOFTENING ON TREE 

 FIRST PICKI 



SECOND PICKING 



T 



J 



x - 



riRKOR) 



FR-(R)U^ 



i ftfi-(OR) 

 |,i?R-(CR> U t,R-CR 



^rfe R °Kj^W R 



1-FR R-\ORW T 0R 1 



l..-o(R>-OR | 

 7FR)-R , 



I 

 1 





•fr-cr 



'^>R-(OR) 



i 15 



JULY 



31 



15 

 AUG. 



31 



15 

 SEPT 



30 



15 



OCT 



31 



15 

 NOV 



id 



DEC. 



31 



15 

 JAN. 



31 



Figure 15. — Firmness (pressure test) of Yellow Transparent apples in relation 

 to stage of ripeness during ripening at various temperatures. The letters on 

 the chart indicate the degree of ripeness, as explained on page 5. The range 

 of firmness or zone representative of each degree of ripeness is given at the 

 right. The letters are omitted from those points at which the designations 

 fall within the corresponding zone at the right, as explained on pages 5 and 0. 



