2^ kgo. sulphuric acid (5^ lbs. each to 22 galls.) ; or, 5 to 

 10 kgo. sulphate of copper to 1 hectolitre water (11-22 lbs. to 

 22 galls. 



In 1897, in Germany, Schultz in Soest, began experiment- 

 ing with Sulphate of Iron and recommended the practice to 

 German farmers. He proposed using 600 litres of 15 per cent 

 solution per hectare (64.2 galls. 15 per cent solution per acre.) 



The following references show the development of the 

 process : 



ADERHOLD, R. — Ein paar Versuche zur Vertilgung des Un- 

 krautes im Gartenrasen. 



Centbl. Bakt. II Abt., Bd. VII (1901), S. 662. 



ANDERSON, J. R.— Wild Mustard. 



Dept. Agr. Brit. Columbia Bui. n, p. 12. E. S. R. 15, p. 265. 



Destruction of Brassica sinapistrum by spraying with S. of I. and S. 

 of C. 



BEHRENS, ( ).— (Experiments on Killing Weeds.) 



Wochenblatt des Landw. Ver. im Grossherzogtum Baden (1902) 

 No. 33. 



Centbl. Agr. Chem., Bd. 33, S. 69. 



Sulphate of Iron Successfully used on calcareous soils. 



BENARD, J.— (Eradication of Weeds.) 



Bui. du Cornice agricole de Reims, Vol. 34 (1898). 



For the eradication of weeds, used 5, 10 and 15 per cent solutions of 

 S. of I. and found them inefficient. Twenty per cent solution efficient 

 but less so than 2 per cent S. of C. solution. 



BIEDENKOPF, H.— Zur Frage zur Bekampfung des Heder- 

 ichs, speziell durch metallsalzlosungen. 



Deut. Landw. Presse, No. 46 (1901), S. 406. 



Has made no study of what he writes, but thinks that no quantitative 

 work has been offered on yield from sprayed vs. unsprayed plots. 

 Thinks soil injured and plants poisoned. 



VON BLUCHER, ( ).— Hederichvertilgung. 



Ann. Landw. der Mecklenburg Vereins (1903), No. 22. 



