- 167 - 



for the vigorous growth of com would be that from slightly 

 above optimum to the end of the "fairly uniform level" . 



The results gotten at the end of 34 days for 

 all the plats (Table "H" IX) show a surprising consist- 

 ency, with the exception of plat 22, which is somewhat 

 low. Prom this it would appear that by calculating 

 the moist\are retained at the same time for all the plats 

 about, or just previous to the most abrupt fall in most 

 of the plats the results will not only give the relative 

 so called drought limit for corn, but will be approximately 

 the amoutt which will be available for corn. Plat 22, 

 however, is the exception; yet this is not marked. Whether 

 these results can be obtained with different soil types, 

 or whether a variation in the conditions of the. evaporation 

 test would affect results can only be determined by fur- 

 ther experiment . 



The results gotten at the e nd of 67 days 

 (Table H, XI) show differences in the same direction 

 as at the end of 34 days, but the differences are per- 

 centagely greater. The samples from plat 22 (22 & 22a) 

 ran about the same as that from plat 10. It will be re- 

 membered that the samples from plat 22 were taken from the 

 poorest part of the whole series under experiment. Sam- 

 ple 22a was taken from the north end of the plat %rhich was 

 representative of the poor spot and 22 from the centre of 

 the plat ( as in the case with the other samples experi- 

 mented with) which was in the edge of this spot. 



