56 



Bffeet of Weeds by Root Interference . 



Paunnel (E.C.P. X, 1048 ; la. 39, 52) atates 



V/ 

 thttt BoiB© weeds are injurious because th9 network of roots 



prevent? th«» fuii dfv^ioi'niint of th^ roots of th& grain 



crop. Other observers have aasuiaed such injurious 



effects, but so far r^s the writ'sr is ai'-are- no conclusive 



experisientE have bsen conducted. 



