PLATE 34 



Cultures with greensand deposits: 



A. — Red clover. Potassium supplied in greensand deposits from Red Bank, N. J. 

 I, Series with greensand marl from upper stratum. 

 II, Series with greensand from lower stratum. 



I — I, Control culture solution containing no potassium. 

 I — I, Control culture. Complete Shive solution (R5C2). 

 [ — 2, Culture solution lacking potassium, plus i ton of greensand marl 



per acre-foot. 

 I — 2, Cultiu'e solution lacking potassium, plus i ton of greensand per 



acre-foot. 

 I — 3, Culture solution lacking potassium, plus 5 to^is of greensand marl 



per acre-foot. 

 I — 3, Culture solution lacking potassium, plus 5 tons of greensand per 



acre-foot. 

 [ — 4, Culture solution lacking potassium, plus 10 tons of greensand 



marl per acre-foot. 

 I — 4, Culture solution lacking potassium, plus 20 tons of greensand per 

 acre-foot. 

 -5, Culture solution lacking potassium, plus 20 tons of greensand marl 

 per acre-foot. 

 [ — 5, Culture solution lacking potassium, plus 20 tons of greensand per 



acre-foot. 

 [ — 6, Culture solution lacking potassium, plus 30 tons of greensand marl 



per acre-foot. 

 I — 6, Culture solution lacking potassium, plus 30 tons of greensand per 

 acre-foot. 

 B. — Turkey Red wheat. Potassium supplied in greensand deposits from Red 



Bank, N. J. Designations of series and of individual cultures as above. 

 C. — I, Turkey Red wheat. Potassium supplied in greensand marl from Pa- 

 munkey Valley, Va. 



1, Control. Culture solution containing no potassium. 



2, Shive solution, complete. 



3, Culture solution lacking potassium, plus i ton of greensand marl per 



acre -foot. 



4, Culture solution lacking potassium, plus 5 tons of greensand marl per 



acre-foot. 



5, Culture solution lacking potassium, plus 10 tons of greensand marl 



per acre-foot. 



6, Culture solution lacking potassium, plus 20 tons of greensand marl 



per acre-foot. 



7, Culture solution lacking potassium, plus 30 tons of greensand marl 



per acre-foot. 

 II, Red clover. Potassium supplied in greensand marl from Pamunkey Val- 

 ley, Va. Designations of individual cultures as in C-I. 



