COMPARISON OF WILTING COEFFICIENT OF PLANTS. 



39 



COMPARISON OF THE WILTING COEFFICIENT FOR DIFFERENT 

 PLANTS BY GROWING THEM SIMULTANEOUSLY IN THE SAME 

 POT. 



In addition to the determinations given in the preceding tables, pot 

 cultures have been made of a large number of different plants with 

 Kubanka wheat growing simultaneously in each pot (Tables XIII 

 and XIV). This procedure renders it possible to make a direct 

 comparison of the relative wilting point of the two plants inde- 

 pendent of any determination of soil moisture (PL II). It also tends 

 to eliminate any disturbances arising from environmental conditions. 

 Differences due to unequal root distribution, however, enter here as 

 in the other determinations. The results are given in Table XIII, 

 which shows the relative time of wilting of the two plants under 

 comparison. Soil-moisture determinations were also made in con- 

 nection with these cultures at the time of wilting, as in the preceding 

 series. 



Table XIII. — Wilting -coefficient determinations in soil No. 30 (fine sandy loam), 

 moisture equivalent 18.5, for different plants grown simultaneously in the same pot 

 with Kubanka wheat. 



Plant species or variety. 



Coeffi- 

 cient. 



Mean. 



Comparison with Kubanka wheat. 



Corn: 



U.S. S.133 



10.1 

 9.9 



9.8 



10.5 

 9.9 



10.0 



10.0 

 9.9 

 9.4 



10.9 



10.2 

 10.4 



10.2 

 10.4 

 11.3 



10.5 

 10.1 

 11.0 



10.0 



10.2 

 10.2 

 10.3 



9.7 



9.8 

 10.1 



10.1 

 9.7 

 10.7 

 10.4 

 10.3 

 11.2 

 10.6 



9.9 

 10.1 



9.8 



10.5 



10.6 



10.5 

 10.0 



10.2 



9.9 





Do 





Do 



Wilted simultaneously; corn shows more 

 discoloration. 



Hopi, A. 7 



Do 





Do 



Wilted simultaneously. 



Triple Hybrid, IT. S. S. 165 



Do 





Do 



Do. 



Indian Flint 





Do 





Do 



Do. 







Do 





Do 



Wilted simultaneously; corn shows more dis- 

 coloration. 



Laguna 



Do 





Do 



Wilted simultaneously. 



Chico, M. 72 



Iowa Silvermine 





Do 





Do 



Do. 



Chinese, S. P. I. 22308 





Do 





Do 



Do. 



Sorghum: 



Black Amber, Minn. 341 





Do 





Do 





Do 





Do 





Do 





Do 





230 





