Vol. 16—1962 - NorthEastern Weed Science Society

Results are given. in Table 4~J'Rotovation fti4elearly the be~'1!'
method of soil incorporat:f:on." The orderJol'activitywas rotovation,
raking, delayed rotovation, diskin')I'surface spray. None
of the crops were injured-by any treatment.
Table 4. -A Comparison of :·86i:l: Incorporation Methods with
Tr1tluralin at 1'''n;!A. Expressed as Percent
Weed Control
359
!r~;f!~a!i~ !!bLA., .... _ ~e!:c!n~ ~e~.. a~n~r~l .• ," i
__ 8gq lr!a~m!!n!: _ .. ... Qr!!s!e! __ ....P!g!e!!d..:
Surface
Disk once
Disk tWice·
Rake·
Rotovate-2
Rotovate-4"
Rotova'te-2
Control
1t
It
, 6 hrs.
--- - - - - ~
..
,1\
70*
77**
90**
97**
100**
79**
o
-(~.~)~-
26
;1 63**
~2*
86**
94;**
96**
iJ: 83**
--
* and ** S18n1fica~1i'at the 5 and J,.!percent level.:,
respect1ve],y,.using the tJ.'~nsormation 'fN:O.~ .
, :. ," '. ,. ',.
Number oi'w$eds per square]foot
Leaching stud1~8were conducted with tr1:tlU:flalin to determine the
rate of leaching from the soi]" surface and 11he depth of leaching
in a soil column. Three soil types were used: Princeton fine
sand, Brookston silty clay loam, . and Hough'tcm- muck.
~eacbiDg_Fram autfacG •• A measured quantity of soil was placed
in _number 2 catlsprovided w.ith' .~bottom drainage. The s oil was
flooded and allowed to drain 16 hours. The trifluralin was then
app.lied at ·2 pounds per acre--to: the soi-l surf-ace and 1, 2, 4,· 6, ­
8 or 10 incbes of water was paned through the soil. 'Fresh II
weight of crabgrass plantsgrow:n from seed;p.anted on the soi~
surface was use~_as a b1010gic.l assay. ' ..
/