ELECTROCULTUEE 



29 



Table 30. — Analysis of the average results of electrical treatments of oat plats at 

 Lincluaeri, England, in the years 1917 to 1920, inclv 



Year 



- ,ze acre yields 

 (bushels; 



Ratio of 



treated to 



Year 



Average acre yields 

 (bushels; 



Ratio of 

 treated to 





i Treated Control 



control 



Treated 



Control 



control 



1917 



44.6 44.0 



1.01 



1.49 



1919 



45.0 



• 



39.3 

 41.3 



1. 14 



1918 



50.2 



1920 



1.06 









The instances specifically considered in Tables 29 and 30 comprise 

 the most notable of the percentage increases reported by Blackman. 

 as shown in Table 28, and they are therefore in a large measure the 

 basis of the 22 per cent average increase reported. One is thus left 

 without definite assurance that the field experiments demonstrate 

 a favorable response to the electrical treatment. 



The pot-culture experiments in England by Blackman and his 

 associates gave results which are summarized in Table 31. 



Table 31. 



-Results of electrical pot-culture experiments with grain crops it 

 land, according to Blackmail 



Yields - 



Year and crop 



Treated Control 



1918: 



Wheat. 

 Maize. 



Barley. 



Maize. 



1919: 



0.72 i 



1.43 1 

 1.21 } 

 1.24 \ 

 2.26 

 2.12 

 1.98 



1.17 \ 



1.12 J 

 ■ . 



S. 37 \ 



10.84 

 10.36 

 10.85 



Maize. 



Barley. 



5.70 

 6. SI 

 2.52 

 16. 73 

 16.03 

 15.01 

 13.72 

 15.84 

 11. 7.5 



0.73 



2.30 



L29 



> 



8. .54 



5.62 

 5.67 

 2.32 



Ratio of 



treated to 



control 



erams) 



Year and crop 



Ratio of 

 treated to 



Treated Control contro1 



:-. 



0.98 

 .97 

 L02 



.92 



.86 



:t5 



.90 

 .86 

 1.04 



1.07 

 .95 

 1.26 

 1.21 

 1.27 



1.01 

 1.20 

 1.08 



Maize- 

 Barley. 



{ £8} *■» 





15.39 

 23.84 

 23.28 



Wheat . 



1921: 



17.66 ] 

 I 18.76 J 



23.88 



16.22 



Barley. 



Maize. 



j M j 



18.69 | 



-•_ 



.73 

 .84 



Average. 



10.60 

 11.79 

 34.0 



37.2 



-.- 2 



53.0 



48.5 



51.9 



22.8 



15.5 



14 27 



18.20 



18.95 



| 10.29 { 



31.5 



46.5 



21.2 

 15.6 



16.60 



L07 

 1.05 

 .99 

 .97 

 L10 

 1.08 

 1.05 

 L15 



L03 



1.14 

 1.07 

 1.18 

 1.05 

 1.13 

 1.04 

 1.11 

 1.07 

 .99 

 .91 

 1.09 

 1.14 



1.01 



As with the tabulated values for field experiments, so here also the 

 results of the pot-culture trials represent more than the electric dis- 

 charge variable: soil and seasonal factors vary as well as the crop 

 and the duration, nature, and strength of the electrical treatment. 

 Making a comparison. 26 trials out of 47 give positive results, while 

 21 give negative results. The treated plants return yields repre- 

 sented by the range 73 to 127: when the untreated plants return a 

 yield represented by 100 and give an average increase of 1 per cent. 

 This increase is well within the experimental error, and the pot- 

 culture trials in their entirety thus furnish no definite evidence of a 

 response to the electrical treatment. 



