Campbells 1902 Soil Culture Manual. 



51 



tration was made from several careful investigations of the location and 

 development of corn roots. In the right hand lower corner you will note 

 the figures to 6, each indicating the circle of roots, indicating the first 

 development, or from the germination of the kernel of corn, while No. 1 

 indicates the second growth of roots, which almost invariably is found to 

 run very close to the surface of moisture. The depth of the early cultiva- 

 tion of the corn, providing we have no immediate subsequent rains to 



0- SEED ROOTS 



1- FIB5T ROOTS 



2- FIR5T CIRCLE 

 3'SECOD ' - 

 ^-THfRO - •■ 

 5-FOURTH ' " 



fc-BR/\cE mors 



Cut No. 9. 



moisten the cultivated portion, largely regulates the location of these roots, 

 therefore it is well to go slightly deeper the first time. Xo. 2 indicates the 

 third line of roots, which is almost invariably found, although starting 

 from the stalk a little higher, to make its way to a lower point beneath the 

 line from which roots Xo. 1 seem to feed. These roots although only 

 shown in the illustration as being single roots running to the right and 

 left as we look at the stalk of corn, vet there is an entire circle around the 



