54 - BULLETIN 815, U. S. DEPARTMENT OF AGRICULTURE. 
Table VIII and figures 6, 7, and 8 show some of the recorded varia- 
tions in season of production of fruit of the Green and Tree-Ripe 
grades by the trees of the various strains in the Lisbon study plat. 
These figures include the records for the 3-year period from July, 
1914, to June, 1917, inclusive, instead of for the entire four years, so 
as to make the data more closely comparable with the similar studies 
on the Eureka variety.1 Pickings were made each month during these 
three years except in April, 1915, and again in April, 1917, as shown 
8 
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“he 
War 
’ SNE 
Mar 
LVCOLIEST L/LSBOYV BALL SOOTWGS TALES OLWV LOWEST DEAK 
PRPODELOLVS Sey SALIv SRIV LATVIA STII DOODSCLs A2OO: LE 
FALES SALES TALES TALES “LA7- THELS oh FPPEZ a EAE 
liq. 6.—Diagram showing the percentage of the total yield of fruit of Lisbon lemons ofthe Green and Tree- 
Ripe grades, by weight, which was produced each month by the trees of the various strains in the in- 
vestigational performance-record plat during the 3-year period from July, 1914, to June, 1917, inclusive. 
The strains are arranged from left to right in the order of their rank for total production, as shown in 
Table V. 
in Table V. No picking was made from the 14 trees in rows 56 and 
57 in April or May, 1917. Although it was certain that at that season 
the amount picked from the trees was not equal each month, the only 
possible procedure was to credit the fruit equally to the months in 
question. 
The size of the picking ring used for fruit of the Green grade during 
the 4-year period is shown in Table IX. The fruit of the Tree- 
Ripe grade was usually “cleaned up” in April and May in this 
orchard. 
1 See U. S. Dept. of Agriculture Bul. 813, entitled “Citrus Fruit Improvement: A Study of Bud Varia- 
tion in the Eureka Lemon.”’ 
