Table 1. Composition of a modified Hoagland's solution used 

 for the culture of angiosperm aquatic plants. 



Salt 



Cone . 



KN0 3 



Ca(N0 3 ) 2 *4H 2 

 MgSCU -7H 2 

 KH2PO4 

 KC1 

 H3BO3 

 MnSO.|-H20 

 ZnSOit*7H 2 

 CuSO.,'5^0 

 (NH 4 ) 6 Mo 7 024-4H 2 

 FeEDDHA 



0.5 M 



** 



* Trace element stock solutions were prepared at 1,000X 

 the concentration of the final solution. One ml of each 

 stock solution was added to each liter of the final 

 culture medium. 



** Iron was provided as a chelate of ethylene di (o-hydroxy- 

 phenylacetate) ; 0.56 ppm of Fe was added when the cul- 

 ture medium was prepared and 0.28 ppm 1-2 weeks into the 

 culture period. 



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