EXERCISE No. 67 

 ROOT GROWTH 



Object: To show the effect of soil on root growth. 



Material: A box five inches deep divided by a partition, 

 with sand on one side of the partition and soil on the other 

 side, and twelve kernels of corn. 



Method: Remove the partition and plant the corn 

 between the sand and the good soil. After the corn has 

 grown about ten inches high, remove the corn with the root 

 system and notice which way the roots have grown and the 

 difference in the size and the number of root hairs on the 

 roots. (The plants should be kept well watered until they 

 are removed.) 



Conclusion : Which soil contained the greater number of 

 roots? Compare the size and length of the roots in the sand 

 with those in the soil. Compare the number of root hairs 

 on the roots in the sand with those in the soil. What caused 

 this difference? What effect has good soil on the root system? 



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