196 JOURNAL OF FORESTRY 



times to four times larger than the same species grown in the unsteri- 

 lized beds. 



The only weeds that appeared throughout the season in the steri- 

 lized beds came from the seeds carried in by the wind after the beds 

 were sterilized. These were mostly dandelion and cotton-wood seed- 

 lings. There were not enough of these, however, to make an item in 

 the cost of growing the seedlings. The unsterilized beds were weeded 

 six times. The costs of weeding the unsterilized beds fully equaled the 

 cost of the sterilizing treatment. 



ARRANGEMENT OF SEEDBEDS 



A convenient arrangement of the seedbeds in the nursery will 

 greatly reduce the cost of sterilizing the beds. 



In the nursery at the Kansas State Experiment Station, any of the 

 beds can be reached from the central alley with a run of 32 feet of pipe 

 with a joint in the middle allowing a free swing at the elbow. 



Beds 4 by 16 feet have been found to be a very convenient size. 

 Sterilizing smaller beds would be more expensive as it would take 

 the same length of time to sterilize a smaller bed as it does for one of 

 this size. Larger beds would be impractical because of the difficulty 

 with which a larger pan could be transferred from one bed to another. 



Low frames are used throughout. When the beds are being ster- 

 ilized, the frames are set aside or stacked, as is most convenient. 



Note. — The illustrations in this article are used through the courtesy of the 

 Kansas State Experiment Station. 



