18 



BULLETIN 821, U. S. DEPAKTMENT OF AGRICULTURE. 



the heated plat. In the nonheated plat 19,200 merchantable fruits 

 were taken from the trees, as compared with 12,440 merchantable 

 fruits in the heated orchard. 



In the May picking relatively few frozen fruits were taken from 

 either plat, but only 2,820 merchantable lemons were found in the 

 nonheated orchard, as compared with 22,820 in the heated one. 



With the exception of the April picking, in which the first mer- 

 chantable fruits were taken from the frozen plat, the heated plat 

 produced a greater percentage of merchantable lemons 

 during each picking throughout the calendar year until 

 the last picking in December. At this time the trees 

 in the frozen orchard had about returned to normal 

 production. 



A study of the tables and diagrams presented for the 

 other plats shows that practically all the nonheated 

 orchards had returned to normal production by the end 

 of the calendar year. 



A similar comparison is shown in figure 7, which por- 

 trays graphically the proportion of frozen and mer- 

 chantable lemons produced on plat 9, an acre of heated 

 Lisbon lemon trees, in comparison with plat 10, an acre 

 of nonheated Lisbon lemon trees. Practically all the 

 frozen fruits in the nonheated orchard were removed 



from the trees at the 

 first picking in March. 

 The heated orchard 

 had 8,380 frozen fruits 

 during that month, as 

 compared with 144,540 

 merchantable lemons. 

 During the succeeding 

 months the heated 

 orchard bore a consid- 

 erable number of sound 

 fruits, while no mer- 

 chantable lemons were 

 taken from the frozen plat until the December picking, when the 

 trees had about returned to normal production. 



Figure 8 shows the number of frozen and merchantable lemons 

 produced on an acre of nonheated Eureka lemon trees (plat 3), 

 as compared with an acre of partially heated (plat 5) and an acre of 

 heated trees (plat 7). 



As in figures 6 and 7, the greater proportion of the fruit in the non- 

 heated orchard is found in the frozen column, with a smaller number 

 in the partially heated orchard, and very few frozen fruits in the 

 heated orchard. This diagram shows very clearly the beneficial 



dill 



Fig. 7. — Diagram showing the number of frozen and merchant- 

 able fruits produced on plat 9, a heated acre of Lisbon lemon 

 trees, and plat 10, a nonheated acre of Lisbon lemon trees. The 

 figures here shown are taken from Tables XIII and XIV, 

 respectively, which give the estimated production by grades for 

 each month's picking for these plats during the calendar year 1913. 



