NURSERY PRACTICE FOR PRAIRIE-PLAIXS PLANTING 



79 



In every instance two-thirds to three-fourths of the total loss sustained 

 occurred before July 1st while the seedlings were small and succulent. 

 His findings substantiate the practice of using variable sowing ratios 

 for different species. 



Figure 22. — Comparative height of deciduous seedlings 10 days after emergence: 



mp 

 % 



A, Lilac, Yi to % inch; B, Russian mulberry, ¥> to % inch; C, green ash, 1H> to 

 inches; D, chokecherry, V/% to 2 inches; E, American plum, 4 to 6 inches; F, 

 bur oak, 3J4 inches. Only the tallest bur oak seedling is 10 days old. 



The recommended sowing ratios for nurseries using furrow irriga 

 tion (to be found in table 22, p. 102) have been shown by experience and 

 actual field tests to be fair ratios under normal growing conditions and 

 good nursery practice. Should unusually favorable moisture condi- 

 tions prevail, it is to be expected that these ratios will result in stands 

 in excess of desired density, thus necessitating thinning. In case over- 

 head irrigation is available, the ratios, especially for the smaller- 



