204 



PLANT GROWTH SUBSTANCES 



TABLE 3 



Oil content and iodine number in Koto flax sprayed with sodium 2,4-D at 



various dosages and dates. 



Differences in percentages of oil were significant at the i per cent point and 

 in iodine number at die 5 per cent point according to the t test. 



Summary 



This paper discusses the response of crop plants especially small grains, 

 flax, and corn to the applications of growth-regulator herbicides, par- 

 ticularly 2,4-D. The work of numerous investigators is cited, and origmal 

 research not yet published is presented. The following statements sum- 

 marize the discussion. 



