EFFECT OF DEPTH OF COVERING SEED 623 



Table 6 summarizes the data from grading 1-0 stock of the several 

 lots and the average weights of tops and roots : 



This would seem to indicate that very shallow covering (y^ inch) 

 in spring sowing gives the best results, because the total number of 

 plants and number of firsts per foot is greater than for other depths, 

 the number of firsts is twice the average, the average size is greater, 

 and development (using weight as an index) is better than for other 

 depths. 



Bigtree 



The germination data indicate that the shallower the sowing the 

 greater amount of germination, both in the first and second years ; that 

 the holdover germination is very high (from 80 to 95 per cent of the 

 total), and that the very shallow covering {]4, inch) gives nearly three 

 times as many seedlings at the end of two years as the closest com- 

 petitor (% inch). Incidentally, the large amount of holdover germi- 

 nation indicates fall sowing for this species. 



