118 



onOBANCHE AS A PARASITE IN BIHAr 



received 20 lb. of sodium nitrate spread ajid mixed witli tlie soil about two 

 weeks l)efore s()\\ii).g (Text-figure 6). 



N 



Toh 



ac<^v 



Nitrate 



Mustard 



M 



Nitrate 



Text-figure 6. 



Mustard. The crop grew well and "tokra " appeared in both plots early 

 m December ; it was entirely 0. indica. There was no appreciable difference 

 in the amount of "tokra" relative to the mustard between the manured and 

 the unmanured plot. As 0. ceniua had been very common in this land in the 

 past season, when it was under tobacco, the predominance of 0. indica when 

 mustard was grown furnished a good illustration of the differences in their 

 parasitism. In four plants, however, 0. cernua was found attached to the 

 roots of mustard indicating further possibilities in the jiarasitism of this 

 species. The actual figures were : — 



Manured (M) 

 Unmanured (0) 



Number of 

 plants 



1,453 



2,553 



Number of 

 O. indica 



2,201 

 3,797 



Number of 

 O. cernua 



4 

 



