Vol. 16—1962 - NorthEastern Weed Science Society

experiment is reported herE!. Trifluralin Wal applied to Clark
and Haros oy soybeans with a. Jf~"" Highb oy spre,yer. Plots wer'e
5 by 25 feet, replicated 3 t~es. Triflura11n weed control resultsare
given in Table 2•• rs,·1;e of 1 pound -per acre gave excellent
grass weed control ·1~ this experiment but only fair brDadleaf
weed control. Four t06 pounds per ac~were necessary for
good broadleaf. weed control. :Nel ther soybean variety was damaged
by any of the treatments.
Table 2. Percent Weed Cont~ol in Soybeans With Trifluralin
Surface Spray ;
- -- - - - - - - - - -
- - - - -
Percent Weed Control
Trifluralin
1
2
4 6
o
-,
- - - - - - - - - - - --
grts~~~
93
96
99
99
o
(65.9).!?J
B~o!dle!f~/_
56
84
88
96
o bl
(2.5)_
357
Grass weeds were crabgrass andfoxtailJ
broadleaf weeds were pigweed and smartweed
'E./
Number weeds per square foot
~o!l_I!!cgrio£a~ign -- An experiment was conducted to determine
if trifluralin activity is improved by soil incorporation. Trifluralin
was sprayed on the soil surface with no incorporation,
raked lightly into the soil, and pre-plant incorporated 2 inches
deep. Herbioides were applied with a sulky or:ig to plots 3 by 15
feet, replicated 4 times. Soybeans, snapbeans, ootton, tomatoes,
cabbage, and cucumbers were planted across the plots.
The results indicate that pre-plant soil incorporation of trifluralin
increased herbicidal activity 4-6 t.imes compared with the
surface spray application (Table 3). One-half pound per acre o·f
trifluralin pre-plant soil incorporated gave" better weed control
than 4 pounds per acre as a surface sp:ray. It'aked plots were"intermediate
in response. Cotton, soybeans, snapb~ans and cabbage
were tolerant to all treatm-ents"J tomatoes and cucumbers were not.