Vol. 16—1962 - NorthEastern Weed Science Society

340
''.l'HI'EFlI'ECT dl"BlMmAL GRANUIARi1lORMUI/lTIONS
OF 2,4-o-D r ON lmRBIOI»ALA'CfIV'ITY
ThOlll&S'1'. T1i!I~'~1"artl!'R1chard D. IlniOki 1
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Granular tormulat~~ot many herbicides have been available
to research workers tor seve~l years. Some ot these investigators
report better weedoentrOl with the granular preparations (1)
while others state that the liquid torms ot ce~a1n herbicides are
more satistaetdJi'J (3). ,,', ,
Previol1s J'work in Ne.'Jersey(2) indicated that a 10 per cent
granular ester ot 2,4-dichlorophenoxyacetic acid (2,4-D) gave better
oontro1 than a 20 ~-aent ester. It was t'urther observed and
reported that a_s10w-bre~downpart,io1e re.ulted in a higher degree
ot' con'tlrol;,than fast'disintegrating particles,; however, more
corn injury was also noted ,with the 10 per cent granular ester.
The present study was designed to further investigate these
findings and to,'detertn1ne' ''the etfectivenesa ot' several sizes of
clay particles and two types of granule br~down.
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Metlid,
and Materi!}.a
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An experiment' was condUcted on a Sassafras sandy loam near
.Jamesburg, NewJersey. N~,.JtFsey No. 8 ~rid field corn was
planted at the rate of tOUr"kemels per hill in 2l-inoh hills on
May 17 an~,t~nned,to two p~ts per .h1ll,~ JW1e 19. The,plots
were, t9UX'.rowP'witte ,and 12 ,~1l8 Ions., Herb.1:ei.:/,anci three ,m__,~, ,~izes Of. the g%!aDu1arcarr1er.L1quid
prepara~ions of the two fQrmulat10ns w.,.
inoluded for comparIson with the granular materials.
1.
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Fbr,merly R'~roh Ass1ataat and AS8001a~eRes.arch Special~
,1st .in ~ C~ps, res.peci1vely, Rut~_· the state Un!ve!"lo
s1tj,:. Ne\t(.~wi~, New~r8ey. .,
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