"  b.   These  soils  tend  to  wash  because  they  lack  humus."

Georgia  field  experiments.  The  Georgia  Agricultural  Experiment
Station  has  reported  a  large  number  of  fertilizer  experiments,
especially  with  cotton  and  corn;  and  the  "  Georgia  rotation  "
has  also  won  distinction  for  that  station.  This  is  a  three-year
rotation,  as  follows:

First  year.   Cotton.
Second  year.  Corn,  with  cowpeas  seeded  at  the  last  cultivation
and  harvested  for  seed  only,  the  vines  being  left  on  the  land  for
soil  improvement.
Third  year.  Winter  oats,  followed  by  a  regular  crop  of  cowpeas
to  be  harvested  for  hay.
For  this  rotation,  on  worn  uplands,  Director  Redding  recom-
mended the  following  applications  per  acre  (Georgia  Bulletin
72,  1906):


CROPS

NITROGEN

PHOSPHORUS

POTASSIUM

VALUE

For  cotton

14

20

12

$   C  22

For  corn

12

IO

14

3  84

For  oats

17

Ti

21

c  27

For  cowpeas  (after  oats)    .     ..
15

10

2.40

Total  for  three  years

43

53

57

$16.83

The  fertilizer  materials  used  are  usually  cotton-seed  meal,  acid
phosphate,  and  potassium  chlorid,  although  some  use  may  be  made
of  sodium  nitrate,  and  kainit  may  replace  the  concentrated  salt.
