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·   24 _ T7m·ty·Sw;th Amt-ual Report
  ,··· i   _Berea Held solution in July. _ Witli the exception of the Lex- ;g.
  ·`»i fi.;     A ington Held, the reduction of potassium nitrate was very pro- #1;
4     nounced by all samples of soil solution. VVith the exceptions .g.
      of the Lincoln Held in April and the Campbellsville Held in at
T     May, the production of CO2 from dextrose was very pro- ·w
    ·'r_l t     nouneed in all samples of soil solution. The development of w
      ‘ non-symbiotic nitrogen assimilating microbes was observed in w
    `_ _ all samples of soil solution, and the decomposition of cellulose .sz
,_L   _1   was observed in none. _ A tw
      , Hydrogen-ion Concentration Studies on Soils. Studies P
  fi; were made on a number of the experiment Held soils and on ' St
 ·,*Q·i.$} i._` L   the sweet clover study soils collected by Professor Roberts in V·
  `   the summer of 1916. The results of this work have been pub- 0
  ,·».   lished in Soil Science, Vol. XV, No. 6, June, 1923. Good cor- tl
    i relation was found between limestone treatment or. natural bl
 ?i ,_ presence of limestone, as indicated by a satisfactory growth 1.
  of legumes, and pH value. Soils satisfactorily growing such  
  , legumes as sweet clover and red clover, and either having been 4;
  limed or else known naturally to cont.ain lime, ranged above
  6.00, usually around 7.00. The unlimed experiment Held soils tl
      and the sweet clover study soils gave poor growth of legumes, A
      varying in general from pH 4.00 to 5.00. is
  Soil Experiment Fields. The results in: general on the t]
  soil fields are in keeping with the results of the previous years. b
  r The· average yields of corn this year on the fields show the le
  great effectiveness of limestone and phosphate in the improve}
  ment of the soils represented by these HeldsQ These yields are b
    significant because they represent yields made possible by soil f.
  , improvement methods used over periods varying from Hyer to 0
  eleven years on the various soil Helds. On. the Russellville f
    field, the moisture conditions were unusually favorable for  
  corn, where generally moisture has been the hunting factor. t.
  The work on the Hopkinsville Held is new, the wheat crop 0
 T  n this year being the Hrst one in the cropping system. The re-
  sults-are s1gn1Heant. The Held was established primarily for D
  the purpose of Hnding a remedy for the low yields of wheat. °
 HE;  ` Christian County formerly grew a large acreage of wheat witl1 F
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