Nature -Study Agriculture 



Different 

 forms of 

 roots 



W. T. Skillino 



FIG. 2. Grasses have fibrous roots. 

 Extending in every direction, they 

 form sod and keep the topsoil in 

 many places from washing away. 



W. T. Skilltng 



FIG. 3. The cabbage needs more 

 support than does grass. Note the 

 strong taproot and the many small 

 roots branching from it. 



how to raise them, the soil in which the crops are raised, 

 and the animals to which they are fed. In a study of 

 agriculture all three of these matters must be included.' 

 We shall begin our study with a consideration of the 

 plant. 



The parts of a plant : the roots. Roots are about as 

 widespread and long underground as are the tops of 

 plants above ground ; and they differ in form as much 

 as do the tops. (Exp. i.) 1 Some plants, as grasses, have 

 fibrous, threadlike roots (Fig. 2). Others, as trees, 

 have roots that are large near the surface but branch 

 and rebranch like limbs and twigs. Still others have 



See Experiments and Observations at end of chapter. 



