200 Missouri Agr. Exp. Sta. Research Bulletin No. 8 



20" F. to 30 F. below zero with but slight injury where the tempera- 

 ture fall is not so rapid. No fruit buds have been found on the 

 Experiment Station grounds that can not be killed by a temperature 

 secured by salt and ice when in the most dormant state, by very rapid 

 fall. The following is a list of the freezings in our laboratory, with 

 the results: 



Table 20. Showing Effect of Slow and Rapid Temperature 

 Fall on Freezing to Death of Plant tissue. 



Kind of Buds 



Rice's Seedling peach. . . 

 Yellow Swan peach .... 

 Early Richmond cherry, 



Rice's Seedling peach. . 

 Yellow Swan peach. . . . 

 Early Richmond cherry 

 Dyehouse cherry 



Rice's Seedling peach. . . 



Elberta peach 



Jonathan apple 



Montmorency cherry. . . 

 Lombard plum 



Hills Chili peach 



Rice's Seedling peach. . 

 Early Richmond cherry 



Elberta peach 



Hills Chili peach 



Rice's Seedling peach. . . 



Rice's Seedling peach.. . 



Elberta peach 



Jonathan apple 



Montmorency cherry. . . 

 Chabot plum 



Date 



Num- 

 ber 

 Buds 



Percent- 

 age 

 Killed 



Mar. 

 Mar. 

 Mar. 

 Mar. 

 Mar. 



Feb. 

 Feb. 

 Feb. 



Slowly to -19.5" C. 



15 

 28 

 16 



Slowly to -20" C. 



10.3 

 30.5 

 45.0 

 22.9 



Slowly to -18.5" C. 



42.3 

 97.7 

 34.3 

 14.1 

 12.9 



Slowly to -15.5" C. 



17.3 

 10.6 

 29.8 



Slowly to -18" C. 



Mar. 8, '131 66 

 Mar. 8,'13 120 

 Mar. 8,'13| 70 



Mar. 

 Mar. 

 Mar. 

 Mar. 

 Mar. 



30.3 

 20.8 

 21.4 



Num- 

 ber 

 Buds 



Percent- 

 age 

 Killed 



Rapidlyto-17.7'> C. 



55 

 86 

 90 



96.4 



100.0 



97.7 



Rapidly to -19" C. 



68 

 64 

 89 

 90 



100.0 



100.0 



98.8 



97.6 



Rapidly to -12" C. 



101 

 86 

 20 

 87 

 99 



37.6 

 61.6 

 70.0 

 17.2 

 47.3 



Rapidly to -10" C. 



49 

 81 

 73 



10.2 

 4.9 



54.8 



Rapidlyto-13.5 C. 



92 

 71 



82 



70.6 

 76.0 

 54.9 



51.9 

 92.9 

 75.7 

 62.5 

 86.8 



