BUD VARIATION IN THE LISBON LEMON. 59 
1916, to a picking ring of a larger size, while in 1915 and 1917 no 
change was made at that time. 
The variations in the production of fruit of the Green and Tree- 
Ripe grades by the trees of the various strains is very forcibly illus- 
trated in Table XI. The average yield for the 3-year period as given 
in Table VIII is calculated to the acre basis and expressed in terms 
of packed boxes. This indicates a yield of 585 packed boxes per 
acre by the 10 highest producing trees, as opposed to 196 packed 
boxes per acre by the 10 lowest producing trees. The trees of the 
Lisbon strain show a production at the rate of 542 packed boxes per 
acre, while the trees of the Dense-Unproductive strain would have 
borne only 186 packed boxes per acre. The average yield of the 10 
highest producing trees was 51 per cent higher than the average for 
the entire plat, while the average of the 10 lowest producing trees 
was only 48 per cent of the average of the plat as a whole, or 32 per 
cent of the average produced by the 10 highest yielding trees. 
TaBLE XI.—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 Lisbon variety 
im the investigational performance-record plat for the 3-year period from July, 1914, to 
June, 1917, wnclusive, as shown in Table VIII. 
Average annual production, 3-year period. 
Production pertree| Calculated production per 
Nurn- 
ber of Description of trees. (pounds). gene (backed boxes): percents 
trees. age of 
average 
Green Tice: Green pte Total, | ofPlat- 
grade ipe | grade ADS oar. 
grade. grade. 
10 | Highest producing (irrespective 
OStTAIM) Reser se inc cere 599. 75 83. 79 513512 71. 69 584. 81 150. 88 
7A MAS COIN GMs conGogoMbeoasocade 532. 86 100. 50 455. 89 85. 98 541. 87 139. 80 
LG SUS GRAM eet nett orreree 568. 85 47.07 486. 68 40. 25 526. 93 135. 94 
33 || SIDOMMB CEN « YGo5sccHeoesoueca 494.72 |y 62.85 423. 26 5B UC 477.03 123. 07 
121 | Entire plat RY oS n eo eeroeue 347. 71 105. 33 297.49 90. 12 Soto Gil eco okeseos 
(| MODEMSERAIMS pase soe set eee 272.16 126. 54 232. 85 108. 26 341.11 88. 00 
10 | Lowest producing (irrespective 
ORSGLAIM) Aires ea eee ataes 195. 87 33. 66 167.58 28. 80 196. 38 50. 66 
8 | Dense-Unproductive strain..... 206. 54 10. 45 176. 71 8.94 185. 65 47.90 
The average weight per fruit for the totai production of fruit of the 
Green and Tree-Ripe grades from the trees of the various strains in 
the Lisbon plat is shown in Table XII, and the average weight per 
fruit of the two grades combined is presented graphically in figure 
9. The trees of the Open strain are shown to have produced fruit 
of the lightest weight, except that the lightest fruits of the Tree-Ripe 
gerade borne by the trees of any strain were from the 10 lowest 
producing trees, which include the 8 Dense-Unproductive ones 
and the 2 lowest producing trees of the Open strain. The trees 
of the Bull strain produced the heaviest green fruit and the heaviest 
average weight of the combined grades. These trees also bear very 
