132 



BULLETIN" 623, U. S. DEPARTMENT OF AGRICULTURE. 



years. The freeze of 1913 reduced the yield of that season below 

 normal, which explains the apparent exception to this rule shown 

 in the production of that year in this table. The trees having a habit 

 of regular production are more desirable than those having a habit of 

 alternate production, but the alternate-bearing trees may not be un- 

 profitable to the grower. In propagation work, buds should be selected 

 only from trees which show a regular and increasing production. 

 The desirability of top-working alternate-bearing trees will depend 

 upon the profitableness of their yield during several seasons, pref- 

 erably for an even number of years. The trees showing a regular 

 decrease in yield should be top-worked when their production is no 

 longer profitable, using buds from trees producing heavy and regular 

 crops. 



Table XIII shows the variation in average yields for a 4-year per- 

 formance-record period of all the trees under observation, arranged 

 in groups illustrating the comparative behavior of different strains 

 and of select trees within some of these strains. 



Table XI. — Performance record of the Washington Navel orange tree No. 7:1-51-16, 

 Productive Washington strain, showing the number and weight of the fruits of each grade 

 and size produced, summarized for a period of five seasons, 1911 to 1915, inclusive." 



[This table plainly shows a gradual decrease in production. The weights are given in pounds and ounces, 

 except that the 5-year totals and the averages are expressed decimallv in pounds. This tree is listed in 

 rank 262 in Tables IV and V.] 



Grades and sizes. 



1911 



1912 



1913 



1914 



1915 



Total. 



Aver- 

 age. 



Weight of fruits: 



276-15 

 21-10 

 2- 



258- 8 

 14-13 



18- 4 



128- 5 

 22- 3 

 35- 



149- 7 



20- 7 



7- 2 



106- 6 



7-11 

 8- 8 



919.6 

 86.7 

 70.9 



183 92 





17.34 



Culls ! 



14 18 







Total 



300- 9 



291- 9 



185- 8 



177- 



122- 9 



1.077.2 



215 44 







Sizes — 



1- 6 



7- 2 

 11- 

 37- 

 39-10 



101- 

 14-11 

 57- 5 

 20-15 



8- 8 



27- 



43- 7 



40- 6 



76-14 



42-15 



32- 4 



5- 5 



5- 2 



0- 



0- 



24- 7 



32- 2 



39- 5 



23- 7 



21-15 



6- 6 



2- 5 



0- 9 



0- 



0- 



7-11 



20- 3 



3.5- 1 



40- 7 



55- 1 



6- 1 



5- 3 



0- 



0-0 



0- 



2- 



2- 2 

 12- 8 

 17- 4 

 27-11 

 24- 9 

 19- 



5-10 



3- 5 

 0- 



62.7 

 105.0 

 138.3 

 195.0 

 187.3 

 170.2 

 46.5 

 68.6 

 24.2 

 8.5 



12 54 



250 



21 00 



216 



27 66 



200 



39 00 



176 



37 46 



150 



34 04 



126 



9 30 



112 



13 72 



96 



4 84 





1 70 







Total 



298- 9 



273- 5 



150- 8 



169-14 



114- 1 



1.006.3 



201 26' 







Number of fruits: 



519 



48 

 4 



696 

 54 

 73 



389 

 84 

 150 



376 

 66 

 34 



240 

 24 

 29 



2,220 

 276 

 290 



444 







Culls » 



58 



Total 



571 



823 



623 



476 



293 



2, 7S6 



557 







Sizes— 



288 and smaller 



6 



22 

 29 

 88 

 84 

 180 

 25 

 92 

 30 

 11 



108 



140 



117 



200 



99 



67 



10 



9 











107 



114 



121 



62 



51 



13 



4 



1 











35 

 66 

 98 

 100 

 122 

 12 

 9 

 

 

 



10 



'7 



37 



46 



65 



51 



34 



9 



5 







266 



349 



402 



496 



421 



323 



82 



111 



35 



11 



53 2 



250 



69 8 



216 



80 4 



200 



99 2 



176 



84 2 



150 



64 6 



126 



16 4 



112 



22 2 



96 



7 





2 2 







Total 



567 



750 



473 



442 



264 



2,496 



499.2 



i The large number of culls occurring in 1913 were caused by the severe freeze of that season. 



