Aug. i6, 1915 



Hybridization and Water Requirement 



401 



Table V. — Effect of self- and cross-pollination on the water requirement of corn in 



IQ14 — Continued 



CONCLUSIONS 



Eight first-generation hybrids of maize and one wheat hybrid, together 

 with their parent strains, were included in water-requirement measure- 

 ments at Akron, Colo., from 1912 to 1914. The hybrids ranged in water 

 requirement from 10 per cent below to 10 per cent above the parental 

 mean. On the basis of the results so far obtained, the chances are even 

 that a maize hybrid will not depart in its water requirement more than 

 ±6 per cent from the parental mean. 



Cross-pollination between individual plants of maize leads to results 

 similar to hybridization of different strains, so far as water requirement 

 and yield are concerned. 



A wheat hybrid which had been grown for several generations gave a 

 water requirement 14 per cent above the mean water requirement of the 

 parental strains. 



