EXPERIMENT STATION BULLETINS. 



313 



increase is so small that we may safely conclude that, with solutions 

 made according to the formula recommended in this bulletin, there is no 

 advantage to be gained by re-heating the solution before using. 



From the results reported in the preceding pages it is plainly evident 

 that the lime-sulfur solutions vary considerably in strength and this is 

 not only true of home-made solutions but also of commercial prepara- 

 tions. In order, then, for the orchardist to do uniform work in his 

 spraying, there should be some simple and fairly accurate means of de- 

 termining the strength of the solution. The relationship between the 

 density and amount of solids in solution, or in other words the specific 

 gravity,, may be taken as a measure of strength. The Baum6 hydrometer 

 is most commonly used for determining the density, and the results are 

 expressed in degrees, compared with water at degrees. The strength of 

 the solution, when determined by the hydrometer, should always be made 

 upon the clear liquid, free from sediment. The following table gives the 

 approximate percentage of soluble sulfur in solutions varying from 33 to 

 17 degrees Baum^, and the dilutions for winter and summer spraying. 



Density, degrees. 

 BaumS. 



3.3 

 32 

 31 

 30 

 29 

 28 

 27 

 26 

 25 

 24 

 23 

 22 

 21 

 20 

 19 

 18 

 17 



Total sulfur. 



% 



26.0 



25.0 



24.0 



23.0 



22.0 



21.0 



20.0 



19.5 



19.0 



18.5 



18.0 



17.75 



17.0 



16.75 



16.25 



16.0 



15.5 



Pounds of sulfur 

 in one gallon of 

 solution. 



lbs. 



2.7 

 2.6 

 2.5 

 2.4 

 2.3 

 2.2 

 2.1 

 2.0 

 1.9 

 1.8 

 1.8 

 1.7 

 1.6 

 1.6 

 1.5 

 1.5 

 1.4 



Dilute to fifty gallons. 



For winter 



spray. 



gals. 



6i 

 6J 

 61 



7 



7i 

 71 

 8i 

 81 

 9 



9J 



91 



10 



lOJ 



10 1 



n\ 



lU 

 12 



For summer 



spray. 



gals. 



1* 

 U 

 1* 

 li 

 1? 



n 



2 



2 



2 



2i 



2} 



2i 



2J 



2i 



2i 



23 



25 



SUMMARY. 



1. Either of the two formulae (50-100-50 or 00-125-00) used in the 

 foregoing experiments, are recommended for the home-making of lime 

 sulfur solutions. When the lime is very rich in calcium oxide the 00-125-60 

 is preferable. 



