41 



It must be remembered that in these cases the total lime soluble in 

 acids is given, not merely the lime present in carI)onate. 



"VVhenever a turnip crop is seen to be infected with "club-root," the 

 land should be well dressed with 3 or 4 tons per acre of quicklime imme- 

 diately 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. 



While it has been indicated that many plants are intolerant to lime, 

 others show the effect of any excess in the soils by a stunted development 

 of the plant, often accompanied by a reduced size of the leaf, and a sickly 

 yellow or even white colour. This unhealthy condition of "chlorosis" is 

 particularly noticeable on the stiff marls, which are but little aerated but 

 contain much calcium carbonate; in Europe it often affects vines, 

 particularly when grafted on American stocks. 



