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t. obacco 3IIt I ly _, -   LW     ·       ·»~- ·     · -9; cy
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  y,y., 1 · fr     Q//1 {ry;. y   _,  
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Beds for Control    o  1     » ,1   .   ,.1  
‘ `*. t — `W '   '    '   ii`? .   V ·~* sy 41 { -*s
*     l 1 Eve   ll i \>l_’    /   `¤ fs ` '-··~l
* of Weeds ‘t   y · ·~   . ‘   T     s
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By 1, F. Freeman.   · V ‘ V   V `     V l
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Untreated left and Methyl Bromide treated >orti0ns of
_ . 1
{ plant bed. Wild grass has crowded tobacco plants out on
the untreated soil.
I
* As weather and soil conditions for treating tobacco about as good control of weeds as did gassing with
plant beds usually are more favorable in the lall than methyl bromide, the most eflectiye ol the other treat-
4111 the spring. experiments were concluctecl with vari- ments.
ous treatment materials at the Kentucky Agricultural The drench treatments look promising. but have
"Experiment Station during the 1952-53 and the 1959- 110t proved effective enough in these tests to be recom-
,;,6-1 seasons to compare the eFfectiveness of spring and mended. _
ilall treatments. The results obtained are given in the (Calcium cynamide was appreciably more ellectiye at
accompanying table. the 2-pound rate than at lower rates.
cl (Ionditions as ll(`fll` ohtimum as tossiblc were no- (Qood tobacco lants were `rown by lVollowin¤‘
. . l . l . l P . g . : ”.
vided lor each treatment 111 the tests. lnach year the recommended plant—bed practices lollowing each ol
bed site was 011 trround which had been in bluevrass the ll`C2ttI11€1lLS in these tests.
£`t 5
socl lor 5 years. (Iontrol of weeds in plant beds (percentages based on weed
’· Not including tl1e treatments with cyanamicle counts per square yard in treated and untreated beds)
icwhich was applied only in the lall, as it is 110t suit-
"2\blC‘ lor spring 2\l)])ll(`&l·l,lOIl), the. spring trcatiiieiits ,].N_mm(_m 1952_5lf;e¤‘e¤¢¤·>¤1¤r3>;)53V54
were slightly mote ellectiye in killing weed seeds than Bumcd with Wood Hm
ylll(‘ lall treatments. lhe averages were /9 percent. kill Fall ..............................................   77
lor lall treatments and 83 percent lor spring treat- _ Spmlg ···················· j ····················· 96 83
_ ments, the basis ol` cotnparison in each case being weed li ·¤¤1·;§g§€d- ntetlwl bromide Q4 80
counts per square yard on treated and on untreated Spring __________________________________________ 94 91
al)C(lS. Drenched, Chlorobromopropene (CBP) and water M
> 'l`he slight percentage dillerence in 1`ayor ol` spring     ·············································   gi
  .4 .     _ _ ._ ‘ in .......................................   t
yittcatment is ol no practical significance, and is out D1_(_m_hGd) Huy] nlmlml
weighed by the better treating conditions tn the lall, Fill] ________________________________________,_____ 77 ,_,,
the clilliculty ol applying early enough in the spring Swing ---·-··-·····-······-······-·····-···· _ ···· ’ *V ····
’l`or the treatment materials to leave the g—mim(1 in 1)¤"lt;l;#l¤ Sodium Cyanarnnle M
Gtn-ne lor seeding the tobaccto`, and the better control ol Calcium Cymmmid(_’ umhcdz
awilclhre by lall treatment. l‘lll`lll€l`lll()l`C, in one ol the 1 lh pc-r sq yd, fall ...................... 58 ....
two years. methyl bromide was as ellecttiye in lall treat- 1% l) PN Sq Y]]]Qll[ US lll $l)l`1Ilg Ll`€2l[lll€l1l. _ “i)r»_iiinr_ _ )A___i*ii Wifi V
ln comparing the tlillerent materials, it is interesting No treatment—nmnbcr of weeds per
. . . l · 4 .   " " ‘(
(to note that thorough burtnng ol plant bed soil gave ”‘l""T_iE@ ‘‘‘‘‘‘‘‘‘‘   ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ ;____i/ll _ _11_ elw
lAortic:ttt.*rt.1nAr. Exvmusriswr Srarioty 21
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