28 



Martin J. Prucha 



troduced into each glass tumbler; the substance to be tested was dissolved 

 in the proper quantity of water, and this was added to each tumbler. 

 Five plants were grown in each tumbler, and all the cultures were made 

 in triplicate and were inoculated. The plants were allowed to grow for 

 four weeks. The kind and the amount of the substance added, together 

 with the results, are given in table 3: 



TABLE 3. 



Influence on Nodule Development of Certain Substances in Varying 

 Quantities 



Substance used 



Quantity 



added to 



300 grams 



of soil 



(grams) 



Condition of plants 



Nodule development 



KNO3 ] 



0.25 

 0.50 

 1.00 

 2.00 



Good growth 



Poor growth 



No growth 



No nodules 

 No nodules 

 No nodules 





No growth 



No nodules 









Ca(N03)2 j 



0.25 

 0.50 

 1.00 

 2.00 



Good growth 



Poor growth 



No growth 



Few nodules 

 No nodules 

 No nodules 





No growth 



No nodules 









MgS04 ] 



0.25 

 0.50 

 1.00 

 2.00 



Good growth 



Good growth 



Good growth 



Good growth 



Nodules abundant 

 Nodules abundant 

 Nodules abundant 

 Nodules abundant 



f 

 KH2PO4.... -j 



0.25 

 0.50 

 1.00 

 2.00 



Good growth 



Good growth 



Good growth 



Good growth 



Nodules abundant 

 Nodules abundant 





Nodules abundant 

 Nodules abundant 



CaCOa 1 



0.25 

 0.50 

 1.00 

 2.00 



Good growth 



Good growth 



Good growth 



Good growth 



Nodules very abundant 

 Nodules very abundant 

 Nodules very abundant 

 Nodules very abundant 





0.25 

 0.50 

 1.00 

 2.00 



No growth 



No nodules 





No growth 



No nodules 



NH4CI \ 



No growth 



No growth 





1 

 I 



No nodules 

 No nodules 





0.25 

 0.50 

 1.00 

 2.00 



No growth 



No nodules 



FeCh ] 



No growth 



No growth 



No growth 



No nodules 

 No nodules 

 No nodules 



