378 



Journal of Agricultural Research 



Vol. XIX, No. 8 



EFFECT OF SIX HOURS' PRESOAKING FOLLOWED BY FORMALIN AND COPPER-SULPHATE 

 TREATMENTS ON HALF-BUSHEL LOTS OF WHEAT SEED 



The next series of experiments was made to determine (i) the effect 

 of the presoak method of treatment, using wheat seed in half -bushel lots 



10 



PERCENTAGE OF GERMINATION 



20 30 40 60 60 ?0 80 



CHINA 



DIETZ 



■^^^^9^^ 



CURRELL 



Fio 6 -Graph showing effect of fonnalin and copper-sulphate presoak treatments of J4-bushel wheat seed 

 lots- A control, untreated; B. seeds soaked in fonnalin i to 3^0 for 10 minutes, drained, covered 6 hours, 

 dried and planted; C, seeds soaked in water 10 minutes, drained, covered 6 hours, then treated with for- 

 maUn as in B, and seeds from upper one-fourth planted; D, seeds from central part of same lot asC; 

 E average germination of C and D; F. seeds soaked in copper sulphate i to 80 for V:. hour, followed by 

 milk of lime and dried; G, seeds soaked in water 10 minutes, drained, covered 6 hours, then treated with 

 copper sulphate as in F, and seeds from upper one-fourth planted; H. seeds from central part of same 

 lot as G ; I , average germination of G and H . In the Currell variety the same procedure was used except 

 that the seeds were sprinkled instead of soaked. 



as in practical usage; (2) the relative effects of soaking and sprinkling; 

 (3) the result of a possible lack of aeration and accumulation of carbon 

 dioxid in the center of the presoak-treated mass of seeds. 



