LABORATORY MANUAL OF HORTICULTURE 



vessel at a constant level by adding hot water from time to time. 

 This level can be determined by measuring the depth of the 

 liquid with a stick that has previously been notched. 



As soon as this solution is cool enough, allow it to settle, pour 

 off the liquid into a cylinder, and test with the hydrometer. Note 

 the reading, and tabulate. Now dilute a portion of the solution 

 with water according to the following scale, until it is the proper 

 strength for a summer spray, and dilute another portion until it 

 is the proper strength for a dormant spray. 



The above table is for diluting the concentrated lime-and-sul- 

 phur solution for the dormant as well as for the summer sprays. 

 The dilution for the summer sprays is usually from thirty-five to 

 forty-five gallons of water when the Baume test is 32 or 33. 

 Now figure out from this table the degree of the dilution of your 

 sample made in the laboratory. 



Example 1. The concentrated lime-sulphur solution, test 35 

 Baume, by the table has a specific gravity of 1.318. If it 

 is desired to spray trees with lime-sulphur at 20 Baume, which 

 has a specific gravity of 1.160, calculate the number of dilu- 

 tions required as follows: the decimal of concentration of the 



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