132 
BULLETIN" 623, IT. S. DEPARTMENT OF AGRICULTURE. 
years. The freeze of 1913 reduced the yield of that season below 
normal, which explains the apparent exception to this rule shown 
in the production of that year in this table. The trees having a habit 
of regular production are more desirable than those having a habit of 
alternate production, but the alternate-bearing trees may not be un- 
profitable to the grower. In propagation work, buds should be selected 
only from trees which show a regular and increasing production. 
The desirability of top-working alternate-bearing trees will depend 
upon the profitableness of their yield during several seasons, pref- 
erably for an even number of years. The trees showing a regular 
decrease in yield should be top-worked when their production is no 
longer profitable, using buds from trees producing heavy and regular 
crops. 
Table XIII shows the variation in average yields for a 4-year per- 
formance-record period of all the trees under observation, arranged 
in groups illustrating the comparative behavior of different strains 
and of select trees within some of these strains. 
Table XI. — Performance record of the Washington Navel orange tree No. 7:1-51-16, 
Productive Washington strain, showing the number and weight of the fruits of each grade 
and size produced, summarized for a period of five seasons, 1911 to 1915, inclusive.- 
[This table plainly shows a gradual decrease in production. The weights are given in pounds and ounces, 
except that the 5-year totals and the averages are expressed decimally in pounds. This tree is listed in 
rank 262 in Tables IV and V.] 
Grades and sizes. 
1911 
1912 
1913 
1914 
1915 
Total. 
Aver- 
age. 
Weight of fruits: 
276-15 
21-10 
2- 
258- 8 
14-13 
18- 4 
128- 5 
22- 3 
35- 
149- 7 
20- 7 
7- 2 
106- 6 
7-11 
8- 8 
919.6 
86.7 
70.9 
183.92 
17.34 
Culls » 
14.18 
Total 
300- 9 
291- 9 
185- 8 
177- 
122- 9 
1.077.2 
215. 44 
Sizes — 
288 and smaller 
1- 6 
7- 2 
11- 
37- 
39-10 
101- 
14-11 
57- 5 
20-15 
8- 8 
27- 
43- 7 
40- 6 
76-14 
42-15 
32- 4 
5- 5 
5- 2 
0- 
0- 
24- 7 
32- 2 
39- 5 
23- 7 
21-15 
6- 6 
2- 5 
0- 9 
0- 
0- 
7-11 
20- 3 
35- 1 
40- 7 
55- 1 
6- 1 
5- 3 
0- 
0-0 
0- 
2- 
2- 2 
12- 8 
' 17- 4 
27-11 
24- 9 
19- 
5-10 
3- 5 
0- 
62.7 
105.0 
138.3 
195.0 
187.3 
170.2 
46.5 
68.6 
24.2 
8.5 
12.54 
250 
21.00 
216 
27.66 
200 
39.00 
176 
37.46 
150 
34.04 
126 
9.30 
112 
13.72 
96 
4.84 
1.70 
Total 
298- 9 
273- 5 
150- 8 
169-14 
114- 1 
1,006.3 
201. 26 
Number of fruits: 
519 
48 
4 
696 
54 
73 
389 
84 
150 
376 
66 
34 
240 
24 
29 
2,220 
276 
290 
444 
55 
Culls ! 
58 
Total 
571 
823 
623 
476 
293 
2,786 
557 
Sizes — 
288 and smaller 
6 
22 
29 
88 
84 
180 
25 
92 
30 
11 
108 
140 
117 
200 
99 
67 
10 
9 


107 
114 
121 
62 
51 
13 
4 
1 


35 
66 
98 
100 
122 
12 
9 



10 
7 
37 
46 
65 
51 
34 
9 
5 

266 
349 
402 
496 
421 
323 
82 
111 
35 
11 
53.2 
250 
69.8 
216 
80.4 
200 
99.2 
176 
84.2 
150 
64.6 
126.. 
16.4 
112 
22.2 
96 
7.0 
2.2 
Total 
567 
750 
473 
442 
264 
2,496 
499.2 
The large number of culls occurring in 1913 were caused by the severe freeze of that season. 
