Vegetable Growing for Market 



'5* 



what laborious task of spraying his crop three times during the growing 

 period." 



Somewhat similar results have been secured by the Department of 

 Agriculture and Technical Instruction for Ireland. In its leaflet (No. 14, 

 revised) is given the results of a series of experiments in spraying Potatoes 

 with solutions of: (1) Sulphate of copper and lime, and (2) Sulphate of 

 copper and washing soda. Here are the figures: 



The growler must decide for himself whether the use of 20 Ib. sulphate of 

 copper and 25 Ib. of washing soda, or 20 Ib. sulphate of copper and 10 Ib. 

 lime (the quantities required per acre) will repay him for the trouble and 

 expense involved if he is only to secure a benefit of 34 cwt. per acre in one 

 case and 50 cwt. in the other, including, presumably, diseased tubers and 

 chats. We feel sure better results will be secured at less expense and 

 trouble by wider planting, as already advised at p. 144. Nevertheless, for 

 the benefit of those who prefer to spend their money in washes and sprays 

 rather than in better cultural methods, we give the recipes for making the 

 mixtures from the Irish Agricultural Department's leaflet, copies of which, 

 of course, can be obtained on application. 



RECIPE I. Sulphate of Copper and Washing Soda (Burgundy Mixture). 

 The mixture is made in the following proportions: 



2 Ib. sulphate of copper, 98 per cent purity. 

 2J Ib. washing soda, 98 



10 gal. of clean water. 



For large areas it is recommended to make up four times the above 

 quantities in a 40-gal. paraffin barrel in the following way: " Thoroughly 

 wash out the barrel and pour into it 35 gal. of clean water. The 

 8 Ib. of sulphate of copper should then be put into a canvas bag, or 

 tied up in a piece of canvas cloth, and put into and moved about in the 

 water in the barrel until the crystals are dissolved. This operation can be 

 more quickly accomplished if the crystals of sulphate of copper have been 

 previously ground. 



"Having prepared the solution of sulphate of copper, next dissolve 

 the 10 Ib. of washing soda in 5 gal. of water in a separate vessel. Then 

 pour the washing soda solution slowly into the copper sulphate solution 

 in the barrel, stirring continuously. The mixture should then be ready 

 for use." 



