304 GREENHOUSE MANAGEMENT. 



of bed, and in water, either alone or combined with 

 other chemicals. Two or even three tablespoonfnls in a 

 twelve-quart watering pot of water will be perfectly safe. 



Sulphate and Muriate of Potash are the usual 

 materials used as a source of potash, and when wood 

 ashes cannot be obtained, are extremely valuable. The 

 sulphate is the best form for greenhouse use, and may be 

 applied either broadcasted and mixed with the soil, or in 

 solution in water. They should never be used in seed 

 boxes, or for young plants of any kind, but in repotting 

 large plants or in shallow beds, a tablespoonful to a 

 bushel of the soil can be used to advantage. In water, 

 a tablespoonful to twelve quarts will be safe. 



Kainit is a crude form of potash salts that is of 

 value for supplying potash, and, on account of its strong 

 alkaline nature, it is often used, about the same as the 

 sulphate of potash, for the destruction of insects, worms, 

 etc., in the soil. 



Nitrate of Potash or saltpeter, is also used as a 

 source for both nitrogen and potash. While its cost is 

 an objection to its use in large quantities, it will be 

 found valuable when dissolved in water at the rate of a 

 tablespoonful in eight or ten quarts, and used as a 

 liquid manure. 



Nitrate of Soda is highly recommended for fur- 

 nishing nitrogen for greenhouse crops, and has been 

 tried by many florists. As a rule, however, it has been 

 found a hindrance to the growth of the plants. This is 

 owing to the fact that it has been used in too great 

 strength. When thoroughly mixed with the soil, at the 

 rate of a teaspoonful to a bushel, it will benefit large 

 plants, or use one pound to 100 square feet of bench. 

 As a liquid manure, it will be found safest, and at the 

 rate of a teaspoonful to three gallons of water it will be 

 useful. If used too frequently it may cause too rank a 

 growth of the plants. 



