30 



Martin J. Prucha 



number of nodules was counted and both the total number of nodules 

 and the average per plant for each concentration of the substance were 

 calculated. The results follow in table 4 : 



TABLE 4. Influence of Certain Additional Substances on Nodule Development 



Chenaical used 



Quantity ' 



added to ^y , 

 OAA Number 



(grams) 



Condition 

 of plants 



Number 



of 



smaU 



nodules 



Number 



of 



large 



nodules 



Total N^°jber 

 ^^b^"" nodules 



nodules P^^, 

 plant 



Ca(N03)2 ] 



0.25 10 

 0.50 8 

 1.00 

 2.00 



SmaU 



Small 



Plants killed 

 Plants killed 



6 





6 

 



0.6 

 



Tannic acid • 



0.25 

 0.50 

 1.00 

 2.00 



11 



8 

 12 

 13 



Good 



Good 



Good 



Good 



40 



50 



17 



100 



138 

 41 

 50 

 20 



178 

 91 

 67 



120 



16.2 



11.4 



5.6 



9.2 



KB2PO4 ■ 



0.25 

 0.50 

 1.00 

 2.00 



6 



7 

 4 

 4 



Good 



Good 



Small 



SmaU...... 



10 

 50 

 30 

 16 



50 



58 



10 



5 



60 



108 



40 



21 



10.0 



15.4 



10.0 



5.3 



[ 

 MgSOi ] 



0.25 

 0.50 

 1.00 

 2.00 



14 

 11 

 12 

 13 



Good 



Good 



Good 



Good 



46 

 26 

 60 



24 



100 146 

 50 , 76 

 41 ! 101 

 32 56 



10.4 

 6.9 

 8.4 

 4.3 



KCl .-.. ] 



0.25 

 0.50 

 1.00 

 2.00 



7 

 

 

 



Small 



Plants killed 

 Plants killed 

 Plants killed 



34 



12 



46 



6.6 



f 



KNO3 -i 



0.25 

 0.50 

 1.00 

 2.00 



14 



14 



3 







Good 



SmaU 



Plants kiUed 

 Plants kiUed 



15 







15 



1.1 



NHiCl • 



0.25 

 0.50 

 1.00 

 2.00 



12 

 2 

 

 



Good 



SmaU 



Plants killed 

 Plants kiUed 





 





 





 





 



f 

 Witte's peptone ] 



0.25 

 0.50 

 1.00 

 2.00 



11 



11 



9 



1 



Good 



Good 



SmaU 



Very smaU. . 



21 



20 



4 



8 

 2 

 



29 



22 



4 



2.6 

 2.0 

 0.4 



