134 BULLETIN 623, U. S. DEPARTMENT OF AGRICULTURE. 
The groups do not include equal numbers of trees, so no attempt 
should be made to draw final conclusions from Table XIII as to the 
exact behavior of the different strains represented. Although the 
average of the crops of the 5 1 trees of the Thomson strain is higher 
than the average of the 363 trees of the Washington strain, the heaviest 
prochicing individual trees are of the Washington strain. If the aver- 
age of the Washington strain can be raised by bud selection to the 
average of the best trees within this strain as indicated by these in- 
vestigations, then the strain as a whole will be more productive than 
the Thomson strain. The superior quality of the fruit of the Wash- 
ington strain, as mentioned in the description of that strain, is an 
added reason for its propagation. 
Table XIV shows the same groups of trees as those in Table XIII, 
but arranged in the order of their average individual tree produc- 
tion of first-grade fruit. On this basis of rank, the 10 highest pro- 
ducing trees of the Washington strain retain their position in 
first place. Table XIV, together with Table XIII, brings out the fact 
established in these investigations that the heaviest yielding trees also 
produce the largest quantity of first-grade fruit, and the lowest yield- 
ing trees produce the smallest quantity of fruit of this grade, 
Table XIV. — Average annual crop of individual Washington Navel orange trees of several 
of the important strains found in the investigational performance-record plats, ranked 
according to the weight of the fruits of the Orchard grade produced and showing production , 
by commercial grades for four years, 1912 to 1915, inclusive. 
Num- 
ber of 
trees. 
10 
4 
51 
1 
2 
363 
1 
8 
13 
10 
35 
1 
10 
2 
Description of trees. 
Highest producing (all Washington strain). 
Thomson-Washington strain 
Thomson strain 
Yellow Thomson strain 
Sporting Thomson strain 
Washington strain 
Washington- Thomson strain ] 128. 
Golden Nugget strain .' 
Yellow Washington strain 
Lowest producing, Washington strain • 
Unproductive strain 
Sporting Washington strain '. 
Lowest producing (irrespective of strain) 
Wrinkled Australian strain 
General average. 
Average annua 
production per 
tree (pounds). 
Orchard 
Stand- 
ard 
grade. 
Cull 
Total 
grade. 
fruits. 
crop. 
293.8 
49.8 
29.7 
373.3 
224.4 
32.3 
10.5 
267.2 
185.3 
31.0 
10.5 
226.8 
173.9 
47.6 
42.8 
264.3 
163.7 
42.0 
25.7 
231.4 
163.4 
27.6 
16.4 
207.4 
128.8 
15.1 
6.5 
150.4 
127.7 
32.1 
39.7 
199.5 
85.8- 
15.6 
13.3 
114.7 
80.7 
18.7 
7.1 
106.5 
59.4 
16.2 
7.6 
83.2 
51.5 
72.3 
16.2 
140.0 
42.8 
13.0 
7.2 
63.0 
42.4 
85.4 
16.3 
144.1 
155.2 
27.4 
15.4 
198.0 
Figure 9, which is prepared from the data presented in Table XIV, 
shows graphically the percentages of fruits of the Orchard, Standard, 
and Cull grades in the average annual crops of individual trees of 
some of the Washington Navel orange strains, ranked in the order of 
their production by weight of first-grade fruit. The commercial 
grades are assorted on the basis of appearance, including the shape 
