V   ~
g 18 ‘ Thirty-ninth Ammal Report
~ .
  . blades of bluegrass with the synthetic diet, thus showing that
  I the alcoholic extract contained some of the growtlrpromoting
  i , factors. Analysis of the alcoholic extract of bluegrass blades »
‘ { f showed the presence in it of small amounts of copper, man- _
P   ganese and zinc compounds in connection with iron, phos-
V ; , phorus, magnesium, potassium and sulfur. No calcium was
V — Q   found in the alcoholic extract. .
V   Chlorosis of Pin-Oaks. Aichlorosis of pin-oaks, occurring
s_     both in the nursery and in plantings in Lexington and vicinity,
. ` V   has been studied. The ehlorotic plants develop in areas where
V ·V     large amounts of calcium carbonate occur in the soil. It-may ·
. "     be brought about from washings from limestone roads or with
, Q   rubbish in filled ground. In the slightly acid soils in the blue-
V V   grass section of the state, these oaks appear to grow normally.
A       The natural distribution of the trees suggests that the habitat
~   is .a_ slightly acid soil. Chemical analyses of chloroticx and
, » V     healthy leaves show the manganese content to be low in the
I · . i   ehlorotic leaves, the other mineral constituents appearing to be
I f in T   ·[ y about the same in both. In soils where pin—oaks fail, bur-oaks
l l ·     appear to grow normally.
‘   § ‘ Effect of Pruning upon Fruit Production. The marked
~ V.   _ difference reported in previous years i11 the production of `
’   l lightly pruned trees in the permanent rows as compared with
» "     · heavily pruned trees of the same varieties of corresponding
V     » age in the filler rows was again apparent in 1926. The ra.tio A
Y V     . of production for four years, 1923 to 1926 inclusive, for 66 ‘
. ,.,5fV if  V permanent apple trees with continued light pruning was 295lé
_ __,. {Q.   J bushels; for 66 filler apple trees with moderately heavy prun-
  _` ·...   i ".`’ i _-[ V ing, 153% bushels.
t   VV   I Peaches. In a study of the relative merits of planting
      peaeh trees of different sizes, the following observations are I
    _·‘`. l   thug far Outstanding; (1) hledium size NO. I t1'G€S 1113kC lJ€tt€I'
  { -. V·,_   trees in the orchard than oversize trees, and cost less; (2) small
  _,,‘   2 to 3 feet trees, if healthy, are practically equal to medium
  ,1j{;[‘_§f sized trees on strong land; (3) large trees, 5 to 6 feet, and
    heavily branched, do not make a uniform top growth when
    pruned back to a whip at planting time, since the strong, vigor-
g gi—_.Qf    
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