PLANTS ARE INFLUENCED BY SOIL 



20: 



part of the plant -substance is water. The water is not 

 only itself plant - food, bul it carries other foods into the 

 plant and transports them from tissue to tissue. Eowever 

 rich a soil may be in mineral plant -foods, it is inert if it 

 contains no moisture. Tht character of tin plant is often 

 determined mon by tin moistun in tin soil limn by all fin 

 other food materials. Note how rank the plants are in low 

 places. Observe how the weeds grow about the barn where 







m 



r-S*^ 



"Lodged" oats, On rich ground the grain i- often broken by wind and rain, 

 the plants bavins grown 10 heavj :is t< be unable to support thems< 



the soil is not only rich bul where moisture is distributed 

 from the eaves. Contrasl with these instances the punj 

 plauts which grow in dry places. In dry countries irriga 

 tion is employed to make plants grow vigorously. In 

 moisl and rich Boil plants maj grow bo Pas! and bo tall 

 m< 1 1 < > 1 to be able to withstand the wind, as in Pig. 355. 



347. PLANTS ARE 1NFLUKNCKI) BY THB BZPOSUKI 01 IH! 



place in which they grow.-- The particular Bite or out- 

 look is known as the expositn or aspect. The exposure, 

 for instance, ma) be Bouthward, eastward, bleak, warm, 



