﻿PLANT 
  BREEDING 
  

  

  185 
  

  

  Every 
  other 
  row 
  should 
  be 
  detasseled, 
  to 
  prevent 
  the 
  plants 
  

   from 
  pollinating 
  their 
  own 
  ears, 
  and 
  seed 
  ears 
  should 
  be 
  saved 
  

   only 
  from 
  the 
  detasseled 
  rows. 
  

  

  4. 
  The 
  continuation, 
  during 
  subsequent 
  seasons, 
  of 
  the 
  

   process 
  of 
  seed 
  growing 
  from 
  the 
  best 
  plants 
  obtained 
  by 
  

   the 
  process 
  of 
  paragraph 
  3. 
  

  

  In 
  beginning 
  to 
  breed 
  corn 
  it 
  is 
  better 
  to 
  use 
  seed 
  obtained 
  

   from 
  the 
  locality 
  in 
  which 
  the 
  experiment 
  is 
  to 
  be 
  made 
  ; 
  that 
  

  

  FIG. 
  159. 
  Cross-pollination 
  and 
  self-pollinatiou 
  

  

  The 
  effect 
  of 
  cross-pollination 
  and 
  of 
  self-pollination 
  on 
  the 
  growth 
  of 
  corn 
  from 
  

   the 
  seed. 
  The 
  two 
  rows 
  of 
  small 
  plants 
  at 
  the 
  left 
  grew 
  from 
  seed 
  produced 
  by 
  

   self-pollination, 
  the 
  larger 
  plants 
  of 
  the 
  other 
  rows 
  from 
  seed 
  produced 
  by 
  cross- 
  

   pollination. 
  Photograph 
  furnished 
  by 
  Funk 
  Bros. 
  Seed 
  Co. 
  

  

  grown 
  under 
  decidedly 
  different 
  conditions 
  may 
  not 
  succeed. 
  

   If 
  high-oil 
  or 
  low-oil 
  com, 
  or 
  high-protein 
  or 
  low-protein 
  corn, 
  

   is 
  desired, 
  the 
  ears 
  used 
  for 
  seed 
  must 
  be 
  carefully 
  chosen 
  

   with 
  reference 
  to 
  the 
  development 
  of 
  the 
  horn-like 
  endosperm 
  

   or 
  of 
  the 
  embryo 
  (figs. 
  157 
  and 
  158). 
  Selection 
  in 
  the 
  field, 
  

   as 
  mentioned 
  in 
  paragraph 
  2, 
  is 
  necessary 
  in 
  order 
  to 
  make 
  

   sure 
  that 
  the 
  ears 
  chosen 
  grew 
  on 
  vigorous 
  plants 
  and 
  that 
  

   ears 
  from 
  the 
  same 
  plant 
  are 
  kept 
  together. 
  If 
  detasseling 
  is 
  

  

  