138 BULLETIN 623, U. S. DEPARTMENT OF AGRICULTURE. 
For this reason the propagation- of the highest yielding trees means 
both larger and better crops of fruit. 
In order to present more clearly the importance of the production 
of the more desirable commercial sizes of fruits by the heavy- Yielding 
trees, figure 13 shows graphically, in terms of packed boxes, the 
proportions of the various sizes produced by the 10 highest and the 
10 lowest yielding trees. This diagram emphasizes the large propor- 
tion of the most valuable commercial sizes (200, 176, 150, and 126) 
borne by the heavy-producing trees in comparison with the small 
number of fruits of these sizes borne by the low-yielding trees 
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Fig. 13. — Diagram showing the average number of fruits of the various commercial sizes produced annually 
during a 4-year period by the 10 highest and 10 lowest yielding trees, irrespective of strain, in the investi- 
gational performance-record plats of the Washington Navel orange. This production is expressed as. 
percentages of a packed box, calculated from the number of fruits of the different sizes. The percentage 
of most desirable sizes is also stated, and the production and value are calculated on the acre basis. 
The highest producing trees bore an average of 4.73 packed boxes 
per tree, as compared with a yield of 0.76 of a packed box by the 
lowest producing trees. On an acre basis at the rate of planting in 
the performance-record plat, this yield amounted to 378.6 packed 
boxes per acre for the best trees, as compared with 61 packed boxes 
per acre for the lowest producing trees. The value of this produc- 
tion, figured on the basis of the actual prices obtained for the crops 
during the period of observation, was $636.05 per acre annually for 
the high-producing trees, as compared with $100.04 for the low- 
producing trees. The higher value of the crops from the high- 
producing trees is partially due to the fact that 69.1 per cent of their 
crops was of the most desirable sizes and 78. 7 per cent was first-grade 
