210 THE LIVING ORGANISMS OF THE SOIL [chap. vii. 



It must be remembered that in these cases the total 

 lime soluble in acids is given, not merely the lime 

 present in carbonate. 



Whenever a turnip crop is seen to be infected with 

 " finger-and-toe " the land should be well dressed with 

 3 or 4 tons per acre of quicklime immediately the 

 crop has been removed ; as long an interval as possible 

 should be given before again taking a cruciferous crop, 

 substituting, for example, mangolds for turnips in the 

 next rotation ; every effort should be made to destroy 

 cruciferous weeds like charlock ; turnip-fed dung should 

 not be applied, and another dressing of finely divided 

 quicklime should be put on for the crop preceding 

 the sowing of the new turnip crop. 



