64 



FORESTRY AND IRRIGATION 



February. 



crops observed and there recorded, three instances, to have exerted very 



The southern field in this figure was marked effects upon the stand of grain 



60 rods from east to west and 30 rods and in one of these fields, on one por- 



wide. It will be seen that the half tion of the protecting corn stubble, 



of the field stretching out into the there was a strong growth of dock 



WOODS 



QRJLS.S n=w 



PLoWtO Ml G<*H 



Fig. 2. Showing three fields and surroundings where oats 

 had been entirely killed, together with areas protected 

 from the wind. 



path of the free wind coming through 

 the gap between the two pieces of 

 woods, as indicated by the arrow, has 

 lost all of the crop, while the stand 

 increased toward the woods on the 

 west and was good at a distance of 10 

 to 20 rods from them. 



The piece of oats lying on the south 

 side of the scantily wooded pasture 

 was in excellent condition, and al- 

 though only 15 rods wide, a very ap- 

 preciable difference could be seen in 



OPEN FELD3 



sorrel. To the leeward of this part 

 of the field the oats had been much 

 less injured, suggesting that the ef- 

 fect of the humidity of the air passing 

 across this may have been enough al- 

 tered to render the wind current ap- 

 preciably less destructive. Observa- 

 tions like these appear to place be- 

 yond doubt that, under certain condi- 

 tions, at least, wind-breaks do exert a 

 very measurable effect upon the vege- 

 tation of cultivated fields. 



HOODED P&SYVJRE 



Fig. 3. Showing protection afforded to grain by woods 

 and direction of destructive winds. 



the stand of clover, to which the field 

 had been seeded, on the margin most 

 distant from the pasture. Even fields 



On three other oat fields which had 

 been seeded to clover and which were 

 bordered on the west with fields of 



of corn stubble having fields of oats grass, the number of clover plants 

 to their leeward were observed, in upon unit areas which had survived 



