26 



CIRCULAR 912. U 



DEPARTMENT OF AGRICULTURE 



summer of 1936 and in the following year as a result of the severe 

 drought conditions. Shrubs planted on the station grounds and 

 under irrigation remained free of whiter injury and progressed quite 

 well. A. tataricum is recommended for both windbreak and 

 ornamental planting under irrigation. 



Acer sp. (7550 2 ), — This species, originally from northern China. 

 lived for 13 years, although new growth was killed back each year. 

 It cannot be recommended for planting in the area. 



Amelanchier stolonijera. — This species has been used to some 

 extent in home-orchard plantings throughout the area. It is hardy 

 but has a very dwarf habit of growth and suckers profusely under 

 cultivation. Heavy crops of fruit useful for pie and sauce were 

 produced in most years. The species is more suitable for planting 

 in the home orchard than as a windbreak tree. 



Betula papyrifera. — Data on this species are confined to plantings 

 at the Mandan station. Winter injury was very heavy after 1925. 

 The last trees died in 1934. It has no value as a dry-land windbreak 

 tree. 



Betula populifolia. — Data on this species are confined to plantings 

 at the Mandan station. Trees suffered varying degrees of killing 

 back in most years. The last trees of one test block died in 1934 

 and those of the other one in 1935. A few trees planted on the 

 station grounds in 1916. and which were irrigated since 1920. did 

 much better. Winter injury to these trees was minor and none died. 

 The species has value as an ornamental only under irrigation. 



Figure 2. — Trees of Betula sp. severely injured by drought, as they appeared 

 in June 1934, at Mandan. X. Dak. 



- Mandan accession number. 



