SUCCESS IN MARKET GARDENING 



a great number of market gardeners have tried 

 it with almost universal success, and I have no 

 doubt that it is one of the most beneficial treatments 

 that lettuce growers employ. 



Some sceptics have claimed that the high tem- 

 perature to which the soil is subjected destroys the 

 bacteria in the soil, which are so beneficial to the 

 process of changing the nitrogen compounds to 

 nitrites and thence to nitrates, which are the avail- 

 able forms of plant food. 



This may be true if commercial fertilizers are 

 used; but if stable manure is used this argument 

 has no weight, as there are enough bacteria in the 

 manure to render all the nitrogen available that is 

 necessary. 



FUMIGATION, How CONDUCTED. Fumigation 

 for the suppression of the aphis or green fly (some- 

 times called green louse) on lettuce has been 

 already recommended in our cultural directions 

 for growing that plant. We employ moistened 

 tobacco stems in this case. Tobacco in any form 

 is repulsive to the aphis, which is often driven away 

 from lettuce by strewing the stems on the soil about 

 the plants. As a liquid application, a decoction 

 of hot water and tobacco stemsdilutedto the colour 



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