H 



60 50 10 5 

 6M sss^io <w 



60 15 10 



PH tfSSKOS Ifl t9S tft 6.S/ SJS 5.0 «» 511 



Textfigure 7.— Manganese content of foliage of Phaseolus vulgaris 

 (Dubbele Prinsesseboon) grown on plots with various amounts of lime- 

 stone (1946). 



In all graphs the upper figxires, at the bottom, indicate the amounts of 

 limestone in kg which has been supplied to the plot concerned. N indi- 

 cates a plot permanendy fertilized with nitrate, AS with ammonium sul- 

 fate. The lower figures give the pH of the individual plots. The pH for 

 all plots was estimated in 1946, on July 24, and in 1947, on July 17. As 

 there are three ranges of limed plots and two of those supplied with nitro- 

 gen, a plot occurring on various graphs can be identified only by the pH 

 figure. The letters at the top of the columns mean: H— healthy. A— af- 

 fected, and S.A.— slightly affected. Sometimes, when healthy, as well as 

 affected material, has been gathered on a single plot, this has been repre- 

 sented by two columns with the same date. 



