65 



13. In the present season, weights (dry) were taken of 

 he seedlings from differently treated plots, The statement 

 >elow gives details : 



In the case of the " earth heated " plot the soil was excavated 

 to a depth of 3 inches, spread on iron sheets and heated from 

 below to a temperature of between 200 and 230 F. The soil 

 was on the sheets for a period of about an hour before this 

 temperature was reached. After cooling down it was replaced in 

 the seed-beds. 



Probably neither the " earth heated " plot nor the rdbed 

 plots did as well as they would ordinarily have done owing to the 

 fact that the soil was moist, an unseasonable shower having 

 fallen a few days before the date of burning. This undoubtedly 

 prevented the earth in all cases being heated to so high a 

 temperature as ordinarily. 



1005 9 



