﻿PLANT 
  INDUSTRIES 
  319 
  

  

  that 
  a 
  tree 
  or 
  a 
  bush 
  filled 
  with 
  a 
  large 
  amount 
  of 
  perfect 
  

   fruit 
  or 
  berries 
  is 
  not 
  a 
  usual 
  occurrence 
  in 
  nature. 
  Horti- 
  

   culture 
  attempts 
  to 
  use 
  the 
  plant 
  as 
  a 
  machine 
  for 
  producing 
  

   a 
  large 
  amount 
  of 
  perfect 
  fruit 
  ; 
  to 
  secure 
  this 
  result 
  we 
  must 
  

   make 
  careful 
  use 
  of 
  every 
  known 
  agency 
  that 
  will 
  help 
  the 
  

   machine 
  to 
  work 
  well 
  and 
  that 
  will 
  protect 
  it 
  from 
  those 
  

   things 
  that 
  in 
  nature 
  would 
  injure 
  it 
  or 
  reduce 
  the 
  value 
  of 
  

   its 
  product. 
  The 
  state 
  agricultural 
  experiment 
  stations 
  pub- 
  

   lish 
  instructions 
  for 
  spraying 
  orchard 
  and 
  garden 
  plants. 
  

  

  299. 
  Gardening. 
  Gardening 
  has 
  to 
  do 
  in 
  the 
  main 
  with 
  the 
  

   production 
  of 
  plants 
  whose 
  growing 
  parts 
  men 
  use 
  for 
  food. 
  

   The 
  list 
  of 
  plants 
  thus 
  used 
  is 
  a 
  long 
  and 
  constantly 
  increas- 
  

   ing 
  one, 
  and 
  although 
  the 
  gardening 
  industry 
  is 
  extending 
  

   rapidly, 
  it 
  is 
  not 
  keeping 
  pace 
  with 
  the 
  increasing 
  demands 
  

   for 
  its 
  products. 
  Both 
  vegetable 
  and 
  flower 
  gardening 
  have 
  

   problems 
  distinct 
  from 
  those 
  of 
  other 
  plant 
  industries. 
  Both 
  

   are 
  highly 
  intensive 
  in 
  their 
  nature 
  and 
  present 
  new 
  problems 
  

   in 
  such 
  matters 
  as 
  soil 
  selection 
  and 
  replenishment, 
  cultivation, 
  

   harvesting, 
  marketing, 
  and 
  the 
  prevention 
  of 
  disease. 
  

  

  Wild 
  plants 
  of 
  many 
  kinds 
  are 
  used 
  as 
  medicines, 
  and 
  some 
  

   of 
  these 
  are 
  grown 
  in 
  large 
  quantities 
  in 
  gardens 
  especially 
  

   designed 
  for 
  that 
  purpose. 
  1 
  

  

  300. 
  Plants 
  and 
  the 
  soil. 
  The 
  plants 
  that 
  constitute 
  the 
  

   basis 
  of 
  plant 
  industries 
  depend 
  in 
  large 
  measure 
  upon 
  their 
  

   relation 
  to 
  the 
  soils 
  in 
  which 
  they 
  live. 
  Soils 
  are 
  very 
  differ- 
  

   ent 
  from 
  one 
  another, 
  some 
  by 
  their 
  nature 
  prohibiting 
  the 
  

   life 
  of 
  certain 
  kinds 
  of 
  plants 
  and 
  making 
  possible 
  the 
  growth 
  

   of 
  others. 
  Some 
  of 
  the 
  facts 
  about 
  differences 
  in 
  soils 
  are 
  

   known, 
  others 
  are 
  matters 
  of 
  vigorous 
  argument 
  among 
  

   scientists, 
  and 
  still 
  other 
  problems 
  are 
  recognized 
  by 
  all 
  as 
  

   still 
  wholly 
  unsolved. 
  That 
  the 
  structure 
  of 
  the 
  soil 
  has 
  

   much 
  to 
  do 
  with 
  its 
  appropriateness 
  for 
  plant 
  life 
  is 
  generally 
  

   recognized. 
  Our 
  coarsest 
  gravelly 
  soils 
  consist 
  of 
  much 
  rock 
  

  

  1 
  " 
  Wild 
  Medicinal 
  Plants 
  of 
  the 
  United 
  States," 
  Bulletin 
  83, 
  Bureau 
  of 
  

   Plant 
  Industry, 
  U.S. 
  Dept. 
  Agr., 
  1906 
  ; 
  " 
  American 
  Medicinal 
  Leaves 
  and 
  

   Herbs," 
  Bulletin 
  219, 
  Bureau 
  of 
  Plant 
  Industry, 
  U.S. 
  Dept. 
  Agr., 
  1911. 
  

  

  