EXPERIMENTS IN THINNINGS- 4)93 



C. Unthinned area. 



Experiment II. 



Experiment begun on a furrow-sown crop of Scots' pine 19 

 years old ; width of furrows 30 centimetres, interval between them 

 1 metre. First thinning made at age of 19 years, 4 subsequent 

 ones at intervals of 5 years. 



All the figures were obtained by actual measurement, except 

 those for the quantity of stock at the commencement of the experi- 

 ment, which figures are mere estimates. 



A. Heavily thinned area. 

 Standing stock at 19 years ... O'O 96'10 96'10 



Yield of Windfalls ... 5'73 33'46 39'19 



Thinnings ... 19'16 65-18 84'34 



Standing stock at 40 years ...194-51 76'81 271'32 



Total production up to 40 'years ... 219-40 175 45 394'85 



Increase since the age of 19 years ... 219-40 79*35 298'75 



B. Moderately thinned area. 



Standing stock at 19 years ... O'O 96-10 96*10 



Yield of Windfalls ... 4-79 25'88 30'67 



Thinnings ... 9'71 43'81 53'52 



Standing stock at 40 years ... 174-56 79'01 253'57 



Total production up to 40 years ... 189-06 148'70 337-76 

 Increase since the age of 19 years ... 189*06 52'60 241-66 



