FERTILIZERS WITH LETTUCE. 



61 



"3. Every 100 pounds of tomato fruit takes from the soil 

 approximately : 



Ounces. Ounces. 



Nitrogen. 2.2 Equivalent to Nitrate of soda 14 



Phosphoric acid . . 0.9 " " Dissolved bone black 5 



Potash 4.6 " " Muriate of potash 10 



"4. It is possible to grow a crop of forcing-house toma- 

 toes, amounting to two or more pounds per square foot of 

 bench space, perfectly normal in size, color, taste and 

 chemical composition, by the aid of commercial fertilizers 

 alone, and in soil composed of coal ashes and peat." 



The Connecticut experiments with lettuce. Experi- 

 ments like those detailed for the tomatoes were also made 

 upon lettuce. Four plots (numbered from 38 to 41) of 

 Simpson White-seeded and Tennisball varieties, each con- 

 taining about n)4 square feet, received each 200 pounds 

 of the peat and ashes mixture (containing 5 per cent of 

 peat). The bed was filled to a depth of 6 inches. Some 

 of the details of the test are as follows : 



fertilizers applied. Plot 38. Plot 39. Plot 40. Plot 41 . 



Nitrogen .... 7.11 grams n. So grams 16.59 grams 21.34 grams 



"The facts which this experiment has developed may 

 be summarized as follows: 



