WHEAT SEEDLING AXD NUTRIENT SOLUTION 



8a7 



After the lapse of 46 days, 53.9 p. c. of the ^^P added were found to be 

 taken up by the plant. The volume of the active and inactive solutions 

 amounted to 70 and 60 cm^, respectively, and the P content at the start 

 of the experiment to 1.13 and 0.7 mgm, respectively. As the inactive 

 solution was daily renewed, the P content of this solution was at the end 

 of the experiment almost the same as at the start of the experiment, 

 while the P content of the active solution amounted to only 46 p. c. of 

 its initial value. 



Table 6. — Amount of Phosphorus Migrating from 



THE "Inactive" Roots into the Outer ("Inactive") 



Nutrient in the Course of 1 Day 



To 1 7 of free P present in the inactive roots thus corresponds 0,0063 

 p. c. of the ^^P added to the inner solution. After the lapse of one day, 

 0.076 p. c. of the ^sp added was found to be present in the "inactive" 

 solution, thus in the course of one day 12 y originally present in the roots 

 migrated into the culture solution. After the lapse of 38 days, 78 p. c. of 

 the 32P added were found in the residual parts of the plant which had a 

 P content of 726 y. 



Table 7. — Amount of Phosphorus Migrating from 



THE "Inactive" Roots Into the Outer ("Inactive") 



Nutrient Solution in the Course of 1 Day 



Ad 1. To 1 y free P present in the active roots corresponds 0.0040 p. c. 

 of the 32p added. In the course of one day, 0.04 p. c. of the P 

 added migrated into the inactive solution, thus in the course 

 of 1 day 11 y originally present in the roots moved into the 

 culture solution. 



5 / Ilevesy 



