A Consideration of Adverse Temperatures 329 



market in sections where it would be impossible to succeed 

 without some means of protection. 



Under the conditions in Colorado where the above 

 method was developed, it was found that two men could lay 

 down in the fall about twenty-five trees in a day. In sec- 

 tions where irrigation is not practiced, more attention to 

 loosening the roots before the trees are tipped down would 

 doubtless be necessary. 



While certain other methods of laying down trees for winter 

 protection, such as planting with the trunk in a horizontal 

 position along the ground, with a view to turning or twisting 

 the top sidewise when it is put down to be covered, have 

 been tried, and apparently with some measure of success, 

 the cost is prohibitive except as a small, home orchard 

 proposition, or where the grower has little or no competition 

 in marketing the fruit and is able to secure prices that are 

 commensurate with the cost of production. 



ORCHARD HEATING 



In some fruit-growing sections of the United States, 

 particularly in the irrigated valleys of the intermountain 

 and Pacific coast states and to a less extent in other re- 

 gions, the heating of orchards during the spring to protect 

 the buds, blossoms, or recently formed fruits against injury 

 from untimely frosts or freezes has been developed to a rather 

 high degree of efficiency. The idea of giving artificial 

 protection against low temperatures during this critical period 

 is not new, but some of the methods are developments of the 

 past few years. 



The several methods of frost protection used from time to 

 time are summarized by Wilson ^ as follows : 

 1 Cornell Univ. Expt. Sta. Bull. 316. 



