134 



BULLETIN 623, U. S. DEPARTMENT OF AGRICULTURE. 



The groups do not include equal numbers of trees, so no attempt 

 should be made to draw final conclusions from Table XIII as to the 

 exact behavior of the different strains represented. Although the 

 average of the crops of the 51 trees of the Thomson strain is higher 

 than the average of the 363 trees of the Washington strain, the heaviest 

 producing individual trees are of the Washington strain. If the aver- 

 age of the Washington strain can be raised by bud selection to the 

 average of the best trees within this strain as indicated by these in- 

 vestigations, then the strain as a whole will be more productive than 

 the Thomson strain. The superior quality of the fruit of the Wash- 

 ington strain, as mentioned in the description of that strain, is an 

 added reason for its propagation. 



Table XIV shows the same groups of trees as those in Table XIII, 

 but arranged in the order of their average individual tree produc- 

 tion of first-grade fruit. On this basis of rank, the 10 highest pro- 

 ducing trees of the Washington strain retain their position in 

 first place. Table XIV, together with Table XIII, brings out the fact 

 established in these investigations that the heaviest yielding trees also 

 produce the largest quantity of first-grade fruit, and the lowest yield- 

 ing trees produce the smallest quantity of fruit of this grade. 



Table XIV. — Average annual crop of individual Washington Navel orange trees of several 

 of the important strains found in the investigational performance-record plats, ranked 

 according to the weight of the fruits of the Orchard grade produced and showing production, 

 by commercial grades for four years, 1912 to 1915, inclusive. 



Num- 

 ber of 

 trees. 



10 



4 



51 



1 



2 



363 



1 



8 



13 



10 



35 



1 



10 



2 



Description of trees. 



Highest producing (all Washington strain) 



Thomson-Washington strain 



Thomson strain 



Yellow Thomson strain 



Sporting Thomson strain 



Washington strain 



Washington-Thomson strain 



Golden Nugget strain 



Yellow Washington strain 



Lowest producing, Washington strain 



Unproductive strain 



Sporting Washington strain 



Lowest producing (irrespective of strain). . 

 Wrinkled Australian strain 



General average 



Average annual production per 

 tree (pounds). 



Orchard 



293. 

 224. 

 185. 

 173. 

 163. 

 163. 

 128. 

 127. 



85. 



80. 



59. 



51. 



42. 



42. 



Stand- 

 ard 

 grade. 



32.3 

 31.0 

 47.6 

 42.0 

 27.6 

 15.1 

 32.1 

 15.6 

 18.7 

 16.2 

 72.3 

 13.0 

 85.4 



27.4 



Cull 



fruits. 



29.7 

 10.5 

 10.5 

 42.8 

 25.7 

 16.4 



6.5 

 39.7 

 13.3 



7.1 



7.6 

 16.2 



7.2 

 16.3 



15.4 



Total 

 crop. 



373.3 

 267.2 

 226.8 

 264.3 

 231.4 

 207.4 

 150.4 

 199.5 

 114.7 

 106.5 



83.2 

 140.0 



63.0 

 144.1 



198.0 



Figure 9, which is prepared from the data presented in Table XIV, 

 shows graphically the percentages of fruits of the Orchard, Standard, 

 and Cull grades in the average annual crops of individual trees of 

 some of the Washington Navel orange strains, ranked in the order of 

 their production by weight of first-grade fruit. The commercial 

 grades are assorted on the basis of appearance, including the shape 



