54 Nebraska Agricultural Exp. Station, Research Bui. 6. 
EFFECT OF SIZE OF POTOMETER AS A SOURCE OF 
EXPERIMENTAL ERROR. 1 
Not only transpiration but extensive fertilizer and other 
cultural experiments as well have been conducted in pots by 
various investigators. They are used largely in greenhouse 
experiments, but some agricultural experiment stations have pot 
cultures located in the field where they may be exposed to the 
natural elements. For convenience in handling and economy 
of space, the pots are usually rather small. This is especially 
true of those used in greenhouses. In order to secure accurate 
data to help interpret the results of other investigators and to 
determine the reliability of our own work, the relative growth 
16- Zl- 3^ 
Conrerrfs 239 /bs Confenfs 683 tbs Confen/s 9S6 /bs 
Mots fare- free So//. Mo/sfve-free So//. MO/stctre free So//. 
Fig. 10. — The different sizes of potometers used to determine the effect of the 
quantity of soil upon growth and transpiration. 
'References concerning the effect of soil limitation: Hellriegel (1883), 
Leather (1910, 1911), and Seelhorst and Biinger (1907). 
