198 MANURES FOR FRUIT TREES 



prove a useful manure, etc., for vines. This 

 suggestion was investigated by Delacharlonny ^ 

 and otters in France, who have proved that iron 

 sulphate is a good manure for vines, if the soil 

 does not already contain 6 per cent, or more of 

 iron oxide. 



Not only is iron sulphate a useful manure for 

 vines, greatly increasing the yield of grapes, but 

 it also protects the vines against such diseases 

 as chlorosis, anthracnosis, etc. Concerning this 

 subject, Petit ^ gives the following results of his 

 experiments : — 



From these experiments it is seen that iron 

 sulphate takes the first rank. Petit recommends 

 30 litres {6^ gallons) of a 50 per cent, solution of 

 iron sulphate for treating 1,000 vine stocks — a 



1 Journal d' Agriculture Pratique, 1888, p. 905 ; 1890, pp. 605, 

 711, etc. 



2 Ibid., 1890, p. 385, 



