BUD VARIATION IN" THE LISBON LEMON. 



59 



1916, to ft pickiii<; ling of ft larger kIzo, wliilo in 1915 and 1917 no 

 change Wfts niado at tliftt tinio. 



Tile variations in the pjoduction of fruit of the Green and Treer 

 Ripe grades by the trees of th(5 various strains is very forcibly illus- 

 trated in Tabl(^ XI. The avcvrage yield for the 3-yeftr 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 piclced from the lemon trees of the various strains of the Lisbon variety 

 in the investigational performance-record plat for the 3-year period from July, 1914, to 

 June, 1917, inclusive, as shoivn in Table VIII. 



Num- 

 ber of 

 trees. 



22 



11 



3 



121 



77 

 10 



Description of trees. 



Highest producing (irrespective 

 of strain) 



Lisbon strain 



Bull strain 



Sporting strata 



Entire plat 



Open strain 



Lowest producing (irrespective 

 of strain) •. 



Dense-Unproductive strain 



Average annual production, 3-year period. 



Production pertree 

 (pounds). 



Green 

 grade. 



599. 75 

 532. 86 

 568. 85 

 494. 72 

 347. 71 

 272. 16 



195. 87 

 206. 54 



Tree- 

 Ripe 



83.79 

 100. 50 

 47.07 

 62.85 

 105. 33 

 126. 54 



33.66 

 10.45 



Calculated product ion per 

 acre (packed boxes). 



Green 



513.12 

 455. 89 

 486. 68 

 423. 26 

 297. 49 

 232. 85 



167.58 

 176. 71 



Tree- 

 Ripe 

 grade. 



71.69 

 85.98 

 40.25 

 53.77 

 90.12 

 108. 26 



28.80 

 8.94 



Total. 



584. 81 

 541.87 

 526. 93 

 477. 03 

 387. 61 

 341. 11 



196. 38 

 185. 65 



Percent- 

 age of 

 average 

 of plat. 



150. 88 

 139. 80 

 135. 94 

 123. 07 



88.00 



50.66 

 47.90 



The average weight per fruit for the total production of fruit of the 

 Green arid 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 

 grade 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 



