1962 : 1963 : 1964 ; 1965 ; 1966 ; 1967 ; 1968 



■TEST 4- 



East 



Percent 



Scalped 

 Glass fiber 

 Polyethylene 

 Simazine 



81.5 

 83.0 

 89.0 

 86.0 



73.0 

 73.5 

 83.0 

 77.5 



41 .0 

 51.5 

 63.0 

 53.0 



33.5 

 45.0 

 58.5 

 48.5 



27.5 

 41. 5 

 54.5 

 43.5 



West 



Scalped 

 Glass fiber 

 Polyethylene 

 Simazine 



89.5 

 92.0 

 93.5 

 94.0 



85.0 

 81 .5 

 88.5 

 90.0 



69.5 

 70.5 

 73.5 

 75.0 



63.0 

 61.0 

 68.5 

 70.0 



61.0 

 60.0 

 66.0 

 70.0 



-TEST 5- 



Test area I 



Pevoent 



Weeded 



84 



80 



80 



76 



76 



Glass fiber 



100 



84 



84 



80 



80 



Polyethylene 



92 



83 



88 



80 



76 



Undisturbed 



80 



68 



64 



64 



64 



area 11 













Weeded 



88 



84 



76 



76 



76 



Glass fiber 



100 



92 



76 



76 



76 



Polyethylene 



92 



84 



76 



76 



68 



Undisturbed 



84 



72 



64 



60 



60 



■"■Highest values underlined, 



