388  The  Wohurn  Pot-Culture  Experiments,  1908. 
corresponding  one  less  heavily  dressed.  This  experiment  would 
not  seem,  therefore,  to  bear  out  the  conclusions  obtained  at  the 
farm  in  1908,  nor  those  conducted  in  Scotland,  which  indicated 
that  carbonate  of  magnesia  would  be  a useful  dressing  for 
potatoes.  The  matter  is,  however,  one  that  requires  longer 
and  careful  inquiry,  and  will  be  followed  up  at  the  Woburn 
farm. 
Rainfall 
AT  Woburn  Experimental  Station, 
1909. 
(292  ft.  above  sea  level.) 
1909 
1909 
In. 
In. 
January 
0-66 
July 
2-88 
February  . 
0A2 
August 
2-30 
March 
2-42 
September 
2-26 
April . 
1-47 
October  . 
405 
May  . 
1-52 
November 
0-71 
June  . 
3-88 
December 
2-62 
Total  . 
2519 
POT-CULTURE  EXPERIMENTS,  1908.  * 
The  work  at  the  Pot-culture  Station  in  1908  embraced  the 
following  : — 
1.  Hills’  Experiments  — the  influence  of  lithium  and 
potassium  salts  on  wheat. 
2.  Green-manuring  experiments. 
3.  Experiments  on  the  influence  of  magnesia  in  soils. 
4.  Experiments  with  fertilisers  on  Fen  soil. 
5.  Experiments  with  the  acid  soil  of  Plot  2a — continuous 
barley  (Stackyard  Field). 
6.  Experiments  on  the  inoculation  of  leguminous  crops. 
1.  Hills'  Experiments — the  influence  of  Lithium  and 
Potassium  Salts  on  Wheat. 
In  the  1907  experiments  it  was  found  that  lithium  salts, 
even  when  used  in  quantity  supplying  to  the  soil  only  ’0075 
per  cent,  of  the  metal  lithium,  proved  injurious.  Accordingly, 
in  1908,  the  quantity  of  lithium  was  reduced  by  one  half,  viz., 
to  -00375  per  cent.  The  respective  salts  used  were  the  chloride, 
carbonate,  and  nitrate,  and  these  were  severally  mixed  with 
soil  subsequently  filled  into  earthenware  pots,  each  holding 
about  40  lb.  of  soil.  There  were  two  pots  in  each  set.  Along 
with  this  experiment  was  a similar  one  with  potash  salts,  the 
chloride,  sulphate,  carbonate,  and  nitrate  being  respectively 
used.  These  salts  were  given  in  quantity  to  supply  the  soil 
in  each  case  with  -0075  per  cent,  of  the  metal  potassium. 
