116 Maine Agricultural Experiment Station. 1920. 



Fig. 25. Root injury in greenhouse where the same fertilizer as 

 was used on the plant, the root system of which is shown in Fig. 24, was 

 placed in the pot below the seed-piece unmixed with the soil. 



of the roots which have grown out near the surface of the soil 

 from the stem shown in Fig. 25 have been killed, 3 long, fibrous 

 ones remain. In such cases the roots ran along near the surface 

 till the wall of the pot was reached. Then they passed down- 

 ward through that portion of the soil in the pot that was more 

 remote from the fertilizer. This condition, of course, only 

 obtained where the fertilizer was applied in the drill below the 

 seed-piece. It was exactly in accord with what was observed 

 repeatedly under like conditions in the field. 



It may be of interest to briefly sketch the history of the 

 plant shown in Fig. 25. The seed-piece was planted October 

 3, using fertilizer 5513. The plant broke ground on November 

 18, but it was less than one inch high on December 1. (Plants 

 grown on 5409, carrying the same amounts of ammonia, phos- 

 phoric acid and potash, were from 8 to 14 inches high at this 

 time). By December 15 it was about 1^2 inches high, and was 

 3 inches high on January 1. At that time it had the curled, 



