Bui. 479, U. S. Dept. of Agricultur 



Plate I. 



F-I-CRT 



Comparison of Seedling Stock Grown Under Different Soil Conditions. 



Note the difference in root development. A. Pinus pnnderosa 2-0 Black Hills seed grown in 

 light sandy soil. B. Pinus ponderosa 2-0 Black Hills seed grown in heavy clay soil. 



