_    .  
  ·—“  I , 16 Tlwjrtfieth A./mz-ual Report of the '
_   phate alone, one with acid phosphate and limestone, and one
  V was left untreated. There was a good growth of clover on the
j Q ,, acid phosphate plot, a better growth on the acid phosphate-
. i l _ limestone plot, but a failure on the untreated plot. The clover
  _ Q “   was turned under and tobacco was grown on the plots. The
_ I ' E ‘ yields were 595 lbs., 680 lbs., and 310. lbs. respectively; Wheat,
  was grown after the tobacco, the yields being 20 bushels, 29.3
} g , · bushels and 3.8 bushels, respectively. In a number of eases, on
      , · the western fields clover seeded in August has grown well with I
i I   ' acid phosphate alone, but it has not done so when seeded on
  I H  A wheat in the spring.
i   - As an average of the results of the London, Berea, and the
  n`   , four WQSI€1`H fields, limestone and acid phosphate have given I
;   Q a net gain per rotation of $26.78 against $4.81 for acid phos-
g   _ phate alone, a difference of $21.97. Witlioiit question, the _
I _`   most important requisite for increasing fertility of the soils
{   »»g[ outside of the Bluegrass Region is the use of limestone and
    ti phosphates. However, they should be regarded only as a basis
"   ,., for improvement, for the restoration of nitrogen and organic
  I  p matter is absolutely essential to the maintenance of high pro-
p »··. ,   . duetiveness. It is necessary to grow leguminous crops and rc-
  `   , ' turn some of them to the soil, or manure made from them and
ll]   the other crops produced.
  'l‘here are probably many places in the Bluegrass Region
  _,`'   where it will pay to use limestone for general farm crops,
i:°f¥‘?°i.*.{€l p . especially on the thinner and more worn soils in the Cincin-
ie.  natian Area. lf red clover is generally a failure, limestone
l   _.i``   should be tried on a small area to see if it will make conditions
yjj-f‘i_" .,_·_ il favorable for clover. In all cases it may safely be assumed
1 ·     ` that limestone is necessary for sweet clover and alfalfa, unless
    there are limestone fragments in the soil. It is doubtful if the
  use of phosphates will be profitable on soils containing above
if _`·,   2,000 pounds of phosphorus per acre, especially if the soils con- ‘
 T`.?  _ tain a fair amount of organic matter. Unfortunately, there
  _ are no experiment fields located in the Cincinnatian Area, ex-
  .