Vol. 16—1962 - NorthEastern Weed Science Society

284
A,.· t.)· if'/' (
.,., Tb,41~~ pJ.ota prod~~".. w srcnrtJi, of ~1tgft8lt which anoqi"
cCl!DP~t!!ldwith!=011':for plant nu~~ ..tul ,ep.daU4'~ ,fol'watel'. All tn.,..
~"1ncre.. ecl dla~ c.om ;11.1"'t#~Ulcantl,. n, !'/.
.'
'>I $:J;'TCpve eKc.llentC;9q1;~lof Cluackll"'.x~c(.,:n wua1gnUiCaDtly
injur.d and yield88:f~ected. Th. c~ill8tion treatllelltl of da1.pon, amltro).-T,
and G-34162 witb'fn.adlle were a~~Q!,.~mising in controlling quackgr'88 in
field com. ' " . "","L
In I~neral all treatmant~.,,.~~fect1vely\con,,}.1:.d q~ackgrai8. ,~~r,',
aeems that the CJpt1m\lll\rate of at11ldtae to control ~kJna8 11 al'OlJDdtf.~bJA.
Although atra.Ln-e can be applied nec'.aafully in th. ftaU, early sPring o.t::
p1.nting time .~l1cation8 seem 1IO''t. practical. The.e ~OUld b,.pU.t .~P~i;'
cations - 2 1blk:on fo1iag. in Apl'll'~d 2 1b/A 2-3 week. later on pr8p.r'~ ,
seedbed at com planting time. 811111.1'results h,v. b•• n obtained el8ewh,e/=8(l).
Results from this experiment alao 'lJbstantiated ptei\~ui' f1nd1~18~3)tha(..i . ,
mixing the atl'dlne illllllediately '~.l' applications with the loll improves', .
quackgrau coRth1. By mixing th.! ~h-'mica1 with th.:lio~l·:f.t COl!l8S in clo,-r
contact with t:h.,'mau of rhizomes ~d: sol1 moisture cond'1t1oni'are better'lo
facilitate ab80rPtion of atradn. ",. the roots. In 196:1."'tnCli6i weumad~"otl.
rhizome depth .in the sol1 and the effectivene,s ()f ~tJ'IlI1118. Wooden bo:v:~o'" .....
l'x1 'xl' ware. set in the field at Bl'ound level. 'rh~-inch and 9"iechthtl!i~ .
cuttings were planted horizontally\~-inch and 4-inc!liil'.eepin the .oiL~Jn
order to e1mulate field condition'~'l'hizomes were p"i±it.d ~ho at a11llOs~ ',-,rtical
angles of'·60":70o so that the t~~'ends were one inchJfrtlm the surf.ce.~,':_
Immediately afta. planting, atrazina'at 1 1b/A and 3 lb/A was app1iedaa'sorface
treatment. The average relative nl1ilts ,of four rii~Hcatc,s are presente4ri~
Table III. Atrazine at the rate of, l' IlblA as Ii "urfideaplllicaUon did' not ,­
affect rhizomes planted four inch •• deep. At t'be'3 l'tl/A rate atrazine gave
comp1.tt controlc:;fall rhizomes planted ona inch deep in horizontal 01' vertical
position ltut some milliomes survived which were 4 inchea away from 'the allP'11~4
atradu. Por.~::s'iiateat effect of atradne, 11: 11 of first importanc:e~'
get the Mterial as close as POUib1. totherhizo~fJ~ It 1s of inter.~t~tio
note that rhizomes p'l!aced et a 60-7Q .'~$le wft;ht~e)