BUD VARIATION IN THE EUREKi* LEMON. 



75 



Green and Tree-Hipo 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 1- 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 calcvlated production per acre of fruit of the Green cmd 

 Tree-Ripe grades picked from the lemon trees of the vanoiis strains of the Eureka variety 

 in the investigational performance-record plat for the 3-year period from, July, 191 -j, to 

 June, 1917, inclusive. 



Num- 

 ber of 

 trees. 



Description of trees. 



Average annual production, 3-year period. 



Production per 

 tree (pounds). 



Green 

 grade. 



Tree-Ripe 

 grade. 



Calculated production per 

 acre (packed boxes). 



Green 

 grade. 



Tree-Ripe 

 grade. 



Total. 



Percent- 

 age of 

 average 

 of plat. 



76 

 2 

 117 

 10 

 2 

 17 

 10 

 10 



Highest producing (all Eureka 



strain) 272. 26 



Eureka strain , ISO. 11 



I) ense- Productive s tra in : 23 1 . 10 



Entire plat 1 162. 62 



Small-Open strain ; 153. 79 



Pear-Shape strain ■ 103. 58 



Shade-Tree strain 134. n 



Dense-Unproductive strain 



Lowest producing (irrespective of 

 strain) 



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. S3 

 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 

 114.41 

 129.67 



94. 96 

 78. 26 

 69. 71 

 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 proba.bly 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 



