Studies of Bacillus Radicicola of Canada Field Pea 31 



TABLE 4 (concluded) 



Chemical used 



Quantity- 

 added to 

 300 grams 

 of soil 

 (grams) 



Number 

 of plants 



Condition 

 of plants 



Niunber 



of 



small 



nodules 



Number Total 

 of 1 number 

 large of 

 nodules nodules 



Number 



of 



nodules 



per 



plant 



KOH 



0.25 

 0.50 

 1.00 

 2.00 



12 



10 



3 







Good 



Good 



Small 



Plants killed 



35 

 10 

 11 



50 

 45 

 25 



85 

 55 

 36 



7.1 



5.5 



12.0 



Fe(N03)3 



0.25 

 0.50 

 1.00 

 2.00 



11 



14 



6 







Good 



Good 



SmaU 



4 

 1 

 





 

 



4 

 1 

 



0.4 

 0.1 

 











Ca(H2P04)2.... ] 



0.25 

 0.50 

 1.00 

 2.00 



8 

 14 

 12 



5 



Good 



Good 



Good 



Small 



6 

 90 

 54 



8 



45 

 94 

 60 

 11 



51 



184 



114 



19 



6.4 



13.1 



9.5 



3.8 



CaSOi • 



0.25 

 0.50 

 1.00 

 2.00 



11 

 10 

 14 

 10 



Good 



Good 



Good 



Good 



22 

 15 

 57 

 21 



65 

 60 

 50 

 45 



87 



75 



107 



66 



7.9 

 7.5 



7.4 

 6.6 



FeCU ■ 



0.25 

 0.50 

 1.00 

 2.00 





 

 

 



Plants killed 

 Plants killed 

 Plants killed 

 Plants killed 











Starch \ 



1.00 

 2.00 

 4.00 



12 

 13 



8 



Good 



Good 



Good 



40 

 59 



18 



82 

 40 



42 



122 

 99 

 60 



10.2 

 7.6 

 7.5 



Controls • 





18 

 14 



Good 



Good 







113 

 107 



6.3 

 7.6 



Results 

 The results of experiment 9 are similar to those of experiment 8. The 

 following chemicals added to the soil at the concentrations used in the 

 experiment were injurious to the plants and tended to inhibit the de- 

 velopment of nodules: Ca(N0.3)2, KCl, KNO3, NH4CI, Witte's peptone, 

 Fe(N03)3, and FeCls. On the other hand, tannic acid, KH2PO4, JMgS04, 

 KOH, Ca(H2P04)2, CaSOj, and starch exerted a beneficial influence on 

 nodule development and appeared to have no injurious effect on the plants. 



