BUD VARIATION IN THE EUREKA LEMON. 
75 
Green and Tree-Ripe grades from the trees of the various strains, on 
the basis of their production for the 3-year period from July, 1914, to 
June, 1917, inclusive, as shown in Table XIII. This indicates an 
average total commercial crop of 224 packed boxes per acre by the 
trees of the Eureka strain, and a yield of only 89 boxes per acre by 
the trees of the Dense-Unproductive strain. The 10 highest produc- 
ing trees in the plat bore at the rate of 314 boxes per acre, while the 
10 lowest producing trees would have borne only 84 J boxes on the 
acre basis. The average of the 10 highest producing trees was 60 per 
cent more than the average of the entire plat, and the average of the 
10 lowest producing trees was only 34 per cent of the average of the 
plat as a whole, or 27 per cent of the amount produced by the 10 high- 
est producing trees. 
Table XVI. — Annual yields and calculated production per acre of fruit of the Green and 
Tree-Ripe grades picked from the lemon trees of the various strains of the Eureka variety 
in the investigational performance-record plat for the 3-year period from July, 1914, to 
June, 1917, inclusive. 
Description of trees. 
Average annual production, 3-year period. 
Num- 
ber of 
trees. 
Production per* 
tree (pounds). 
Calculated production per 
acre (packed boxes). 
Percent- 
age of 
Green 
grade. 
Tree-Ripe 
grade. 
Green 
grade. 
Tree-Ripe 
grade. 
Total. 
average 
of plat. 
10 
Highest producing (all Eureka 
272. 26 
95.05 
81.99 
65.91 
66.43 
63.70 
75.67 
24.85 
20.19 
17.31 
232. 93 
154. 09 
197. 72 
139. 13 
131.58 
88.62 
115. 34 
71.60 
69.78 
81.32 
70.10 
56.39 
56. 83 
54.50 
64.74 
21.26 
17.27 
14.81 
314.25 
224. 19 
254. 11 
195. 96 
186. 08 
153. 36 
136. 60 
88.87 
84.59 
160. 36 
76 
180. 11 
231.10 
162. 62 
153. 79 
103. 58 
114.41 
2 
129.67 
117 
Entire plat t 
10 
94.96 
2 
78.26 
17 
134. 81 
83.69 
1.56 
69.71 
10 
10 
Dense- Unproductive strain 
Lowest producing (irrespective of 
45.35 
43.17 
Inasmuch as it is the practice in picking lemons to go over the trees 
at regular intervals, picking each time all fruit that is above a speci- 
fied diameter, it is interesting to determine what differences there 
may be in the average weight of the fruits produced by the trees of 
the different strains. Because of the definite rules governing the time 
of picking and the size of the fruit picked, whatever differences are 
found between any of the strains are probably due to variations in 
(1) the rapidity of growth of the fruit, (2) the physical composition of 
the fruit, or (3) the shape of the fruit. The rapidity of growth of the 
fruit is influenced by the vegetative character of the trees and by the 
quantity of fruit produced. Thick-skinned fruits are lighter than 
thin-skinned ones of the same diameter. Short, rounded fruits are 
usually lighter than fruits of the same cross diameter which are 
longer, unless the increased length is largely made up of thickened 
peel 
