BUD VARIATION IN THE WASHINGTON NAVEL ORANGE. 137 ■ 



weights of the fruits of the different groups. This diagram shows 

 graphically the fact that the heaviest bearing trees produce the largest 

 proportion of the most desirable and valuable sizes of fruits, namely, 

 200, 176, 150, and 126 fruits per box. The most productive trees also 

 bear the largest proportion of the Orchard grade, or first-grade, fruits, 

 as shown by this diagram. On the other hand, the lowest producing 

 trees bear a much larger proportion of extremely small and extremely 

 large fruits, both of which are usually undesirable from the market 

 standpoint. Further, the lowest producing trees bear a smaller per- 

 centage of the first-grade and a larger percentage of second-grade 

 and cull fruits than the highest producing trees. 



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Fig. 12.— Diagram showing the production by commercial sizes and grades of the crops of the 10 highest and 

 10 lowest producing trees, irrespective of strain,'in the investigational performance-record plats of the 

 Washington Navel orange. The figures indicate the proportion of each size or grade to the total crop, 

 calculated from the number of fruits produced during a 4-year period, 1912 to 1915, inclusive. Figure 11 

 shows similar comparisons based on the weight of the crop. 



Figure 12 shows the same comparisons as figure 11, but in this case 

 the percentages are based Upon the number of fruits instead of their 

 weights. This diagram brings out even more forcibly than does 

 figure 11 the fact that the heaviest producing trees bear the largest 

 proportion of the most desirable sizes and best grade of fruits. 



This correlation of heavy yield and superior commercial grade in 

 the production of Washington Navel orange trees' of the Washington 

 strain is very important from the standpoint of the standardization 

 of the variety through bud selection based on performance records. 



