Oct. 1, 1921 



Infltience of Period of Transplanting 



35 



respect to those matters were collected, the heavy loss through heaving 

 at Savenac Nursery more than balanced any possible gains of that 

 kind. Fall transplanting is clearly so.unsafe that no further local experi- 

 ments with it are necessary. 



SPRING TRANSPLANTING 



NURSERY TESTS 



Experiments in the spring of 19 13 had for their object the compari- 

 son of three lots of 600 i-o western white pine each, transplanted on 

 May 17, June 2, and June 16. The first summer's loss from drought 

 increased with the lateness of the transplanting period, as is shown also 

 by figure i. The June 16 lot looked less thrifty than the others at the 

 end of the season, and it was concluded that^ in case of necessity, trans- 

 planting could evidently be continued as late as June 15, though it is 

 not desirable. 



As a control on the tests made in the spring of 19 13 it was arranged 

 to transplant 1,000 i-o western white pine at Savenac Nursery every 

 10 days during the spring of 19 14. This was actually done on April 

 24, May I, May 9, May 20, May 30, June 12, June 19, June 30, and July 

 14. On each of these dates 100 more were removed from the seed- 

 bed, of which the weights and measurements appear in Table I. 



Table I. — Weights and measurements of i-o western white pine on different dates of 

 transplanting in the spring of IQ14 



1 Not recorded. 



In Table I stem length is the distance from the ground line to the tip 

 of the terminal growing point. The stem diameter was measured at the 

 ground line. The average new growth of rootlets was based upon the 

 longest rootlet noted in each plant examined and not upon all new rootlets. 

 This figiure is only relatively correct, because some slight root breakage 

 was unavoidable in taking up the plants from the seed bed. Root growth 

 data were omitted in the two latest lots, since the older portions of the 



* Unpublished progress report. 



