Smithsonian Report. 1938— Hoagland and Arnon 



PLATE 3 



Growth of tomato plants in fertile soil, in nutrient solution, and in pure silica sand irrigated each day with 

 nutrient solution. Fruit has been harvested for 7 weeks prior to taking the photograph. All plants 

 have made excellent growth and set large amounts of fruit in all three media. The general cultural con- 

 ditions, spacing, staking, etc., were the same. 



