FROST PROTECTION IN LFMON ORCHARDS. 



11 



pickings were not all made on the same day. This condition was due 

 to the fact that each plat was of necessity picked in turn, and the care- 

 ful examination of every fruit for possible frost injury rec^uired con- 

 siderable time. The number of pickings for the plats is not the same 

 in all cases, for the reason that in some of the nonheated plats the 

 great proportion of the fruit on the trees at the time of the freeze 

 was removed at the first picking in 1913, while in some of the heated 

 plats as many as eight pickings were made during the year. 



Table V shows the estimated production by grades for an acre of 

 Lisbon lemon trees (plat 1) during February, April, May, June, Au- 

 gust, September, October, and December, 1913. These figures are 

 calculated from the actual individual-tree performance records of five 

 selected trees in the plat. This orchard was nonheated during the 

 winter of 1912-13 and was selected for comparison with plat 4, which 

 is in a Lisbon lemon orchard that was heated during that period. 



Table V. — Total estimated production hy grades from plat 1, an acre of Lisbon lemon 

 trees, for each picking during the calendar year 1913. 



[The data in this plat were computed from the individual-tree records of five Lisbon lemon trees. This 

 plat was not heated during the winter of 1912-13 and was selected for comparison with plat 4 in an 

 orchard of Ivisbon lemon trees which was heated during that period. The data from plat 4 are presented 

 in Tabic VIII.] 



Classification. 



Date of picking. 



Total 

 for year. 



Feb. 14. 



Apr. 7. 



May 14. 



June 24. 



Aug. 11. 



Sept. 12 



Oct. 26. 



Dec. 12. 



Number of frmts: 

 Green grade. 





 



13,300 

 5,900 



2,500 

 320 



2,160 

 1,100 



540 

 640 



300 

 1,080 



1,100 

 600 



9,280 

 40 



29 180 



Tree-Ripe grade 



9,680 



Total merchantable 

 fruit 







19,200 



2,820 



3,260 



1,180 



1,380 



1,700 



9,320 



38,860 





Cull grade 







183, 140 



1,600 

 83,360 



320 

 5,580 



740 

 1,100 



460 

 60 



220 

 340 



800 

 



420 

 



4,560 



Frozen grade 



273, 580 







Total 



183, 110 



104, 160 



8,720 



5,100 



1,700 



1,940 



2,500 



9,740 



317,000 







Weight of fruits: 



Green grade 



Lbs. oz. 

 

 



Lbs. oz. 

 3,506 4 

 1,268 12 



Lbs. oz. 



660 



73 12 



Lbs. oz. 

 488 12 

 207 8 



Lbs. oz. 

 125 

 111 4 



Lbs. oz. 

 60 

 145 



Lbs. oz. 

 282 8 



87 8 



Lbs. oz. 



2,511 4 



10 



Lbs. oz. 

 7,633 12 



Tree-Ripe grade 



1,903 12 



Total merchantable 

 fruit 







4,775 



733 12 



696 4 



236 4 



205 



370 



2. 521 4 



9, 537 8 





'' " 





Cull grade 







17,952 8 



275 

 10,633 12 



60 

 733 12 



91 4 

 101 4 



51 4 

 12 8 



28 12 

 46 4 



80 

 



65 

 



651 4 





29, 480 







Total 



17,952 8 



15,683 12 



1,527 8 



888 12 



300 



280 



450 



2, 586 4 



39,668 12 







A study of the figures shown in Table V shows that at the first 

 picking, on February 14, immediately following the freeze, all of 

 the fruits were frozen. In April the estimated number of sound 

 fruits was 19,200, as compared with 83,360 frozen fruits. Li May 

 there were 2,820 sound lemons and 5,580 frozen ones. In June there 

 were 3,260 merchantable fruits, while the frozen fruits had dropped 

 to 1,100. In succeeding pickings the relative proportion of sound 

 fruits to frozen ones is more marked, with a gradual increase in the 



