91 DUFOUR, J.— Traitements d'hiver centre l'oidium. 



Chron. Agr. et Vit. T. II, p. 75. 



Experiences of wine growers. Two solutions used. A. 6-10 per 

 cent. S. of I. w.th 10 per cent Lime. B. 10-15 per cent S of I 

 with or without 1 per cent Sulphuric Acid. 



92 DUFOUR, J.— Note sur le traitement de la chlorose ou 



jaunisse des plantes. 



Chron. Agr. Vaud. T. IV. p. 223. 



Ztschr. Pflanzenkrank. (1891), S. 136-137. 



Recommends a mixture of, 



S. of 1 3 Kgo 



Lime 2Y2 " 



Water 100 litres 



A 2 per cent solution of S. of I. applied to the leaves burned them. 



93 DUFOUR, J. — Essais de badigeonnage des ceps. 



Chron. Agr. Vaud. T. IV, (1891), p. 41. 



The following compound exercises a very good influence on 



vines : 



S of 1 3 Kgo 



Lime 8 " 



Water 100 Litres 



94 DUFOUR, J.— Chlorose et sulfate de fer. 



Chron. Agr. Vaud. T. X, (1897), p. 626. 



Experiences of wine growers using solutions of varying strengths. 



95 DUFOUR, J. — Badigeonnage des ceps dans les vignes tres 



atteintes par l'oidium en 1896. 

 Chron. Agr. et Vit. du Cant. Vaud. T. X, (1897), p. 107. 

 Used Milk of Lime, Lime-Iron Spray, Sulphate of Iron, and rec- 

 ommends last two, made us as follows : 



10 Kgo. Lime to 80 1. water. 



6-10 Kgo. S. of I. to 20 1. water. 



10-20 Kgo. S. of I. to 20 1. water. 



96 DUFOUR, J.— Le sulfate de fer. 



Chron. Agr. Vaud, T. IV, p. 237. 



Le Cercle agr. de France discussed the question of the use of S. 

 of I. in agriculture. Opinions were varied. 



S. of I. renders service by acting as a stimulant or as some be- 

 lieve as a true nutrient. 



It furnishes two useful substances to plants, — iron (Fe) and sul- 

 phuric acid (SO3). It cannot replace potassium, phosphorous, 

 nitrogen, but used with these substances, good results are ob- 

 tained. 



