WINTER INJURY 



267 



Table LXXX 



data showing influence of shading on the killing of tissue 



(aftek chandler) 



In order to deternihie whether such tissue could also be 

 influenced in like mamier by appljnng fertilizers, a heavy 

 application of potassium chlorid (500 pounds to the acre) 

 was made to peach orchards in different locations over a 

 period of four years. No difference appeared, however, in 

 the amount of winter-killing of the wood, hardiness of the 

 fruit-buds, or of the bloom when spring frosts occurred. 

 However, on determining the sap concentration of twigs from 

 these treated trees, no difference appeared; hence, accord- 

 ing to the previous observations with other plants, no differ- 

 ence in hardiness could be expected. The suggestion is made 

 that if it were possible to increase the sap concentration 

 by the use of fertihzers, some difference in hardiness of the 

 blooms would be anticipated. 



236. Rate of freezing a factor. — Very conclusive data 

 are available to establish that a rapid fall in temperature is 

 much more injurious than a gradual one, either with tissue 

 after the sap is flowing or when it is entirely donnant; par- 

 ticularly is this true with the buds. It has also been shown 



^ To convert centigrade and Fahrenheit temperatures: 



F. — 32 

 Degrees — — - — = Degrees C. 

 1 .8 



Degrees C. X 1.8 + 32 = Degrees F. 



