54 



BULLETIlSr 815, U. S. DEPAKTMEIn]"T OF AGEICULTUEE. 



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-Kipe 

 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.^ Pickings were made each month during these 

 three years except in April, 1915, and again in April, 1917, as shgwn 



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Fig. 6.— Diagr-am showing the percentage of the total yield of fruit of Lisbon lemons of the 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 dming 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 Bui. 813, entitled "Citrus Fruit Improvement: A Study of Bud Varia- 

 tion in the Eureka Lemon." 



