ROOT-KNOT DISEASE OF TOMATOS. 35 



Mineral Salts 



Elements 



Disinfectant Fluids, 

 mainly Proprietary 



Sulphate of potash. 

 Kainit. 



Potassium permanganate. 

 PotassitTm bichromate. 

 Common salt. 

 Bleaching powder. 

 Copper sulphate. 

 Mercury bichloride. 

 Potassium cyanide. 



Sulphur. 



Black carbolic disinfectant. 

 Carbosol. 

 Clubicide. 

 Creol. 

 Izal. 



Jeyes' Fluid. 

 Lysol. 



Evans's Soil Sterilizer. 



6 Bye-products from Coal, Phenol. 



Wood, &c. 



7 Powders. . . . Vaporite. 



" V.C." Powder. 

 " V.N." Powder. 

 Soot. 



In applying these substances, the Vaporite, " V.C." Powder, 

 " V.N." Powder, Naphthalene, and Sulphur were carefully worked 

 into the subsoil dry. The others were applied as watery solutions. 



We found on trial that we could not satisfactorily put on more 

 than 1 gallon to the 2 square feet, and this penetrated to a depth of 

 about 5 inches, the top three inches being loose because of the digging. 

 That rate of watering was therefore adopted and the quantities used 

 to the acre with the strength of solution employed in each case is given 

 in the following table. A week afterwards, as before remarked, all 

 the places were again watered with plain water. 



Table I. — Substances used on Plots in Season 1915, with 

 Quantities and Cost per Acre. 



Acids 



Alkalies 2 

 Elements 3 

 Mineral Salts 4 



Plot. 



Substance 

 applied. 



Quantity per 

 acre. 



I 



Nitric acid 



138 cwt. 



2 

 21 



>> 



Chromic acid 



69 



9'7 M 



20 



Caustic soda 



16 



27 



Sulphur 



30 



3 



Potass, sulphate 



121 



5 



Kainit 



121 



11 





68 



7 



Common salt 



69 



9 



Copper sulphate 



345 „ 



8 



Potass, permang. 



26 



18 



>» 



2-6 „ 



17 



Chlorinated lime 



44'5 » 



37 



>> 



25 



22 



Pot. bichromate 





23 



Merc, bichloride 



7^8 M 



Dilution. 



1/10 



l/25 



1/160 



1/100 



dry 



1/14 



1/14 



1/25 



1/25 



2/100 



1/60 



1 /600 



dry 



dry 



1/120 



1/500 



Price for 

 Calculation.* 



Cost 

 per 

 acre. 



4d. per lb, 



£ 



255 



4 d. „ 



127 



gd. „ 



40 



25s. per cwt. 



20 



125. 6d. „ 



19 



£14 per ton 



84 



70s. per cwt. 



21 



70s. ,, 



12 



2s. 6d. ,, 



9 



£50 per ton 



86 



1 yd. per lb. 



84 

 8 



?d- „ 



I 15s. per cwt. 



33 



155. „ 



19 



j 6d. per lb. 



38 



3s. per lb. 



129 



These are pre-war prices for purchases in small quantities at a time. 



