CROPPING PATTERN AND WATER RELATIONS 



363 



and the origin of the co-ordinate system for every crop separately. In Fig. 5 

 the horizontal axes are given to clarify the appHcabihty of the graph, but 

 they are superfluous because only the distances of shifting log A and Xq 

 matter. 



The logarithmic scale may be changed back and the shifts undone to 

 obtain a readable representation of the cropping pattern The frequency, is 



REST CROPS (D) 



PEAS <P) 



'VorPREQUENC •;. 

 60 ■ 

 50 



40 



l20 



POTATOES (A) 



-® ©' 



FODDER BEETS (Fb) 



^ 





OATS/ BAR L£Y ^-O® 



TEMPORART LEYSCTD^-^'-^N. 



® 



@ 



® 



100 150 200 250cm minus soil surface 



"Tt / Mean depth of 



® 



ean depth of ground -water 

 tabic in summer 



PERMANENT PASTURE (Pp) 



Fig. 5. The cropping pattern parabola gives the relative position of each crop clearly. 

 The shifted co-ordinate axes are given in full for rye. It w^ould be sufficient to give 

 only the origin of the co-ordinate axes if a description of the cropping pattern is 

 desired which is readily readable. 



then plotted against the same co-ordinate scale for the groundwater depth. 

 In Fig. 6 the result is given. The well-known facts that the wetter land is 

 used for grassland and that also fodder beets increase in acreage and that 

 cereals are crops for dryer soils is apparent. The continuous transition of 

 the crop frequency curves point at a continuous change from cattle rearing 

 to cereal culture. 



Summary and Conclusions 



The cropping pattern is a complex indication of the type of farming, de- 

 scribed by the kind of crop and the percentage of occurrence. Important 



