• TABLE OF CONTENTS
HIDE
 Historic note
 Main














Group Title: Agronomy research report - University of Florida New Agronomy Farm ; AG 73-4
Title: Chemical weed control in tobacco
CITATION THUMBNAILS PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00056164/00001
 Material Information
Title: Chemical weed control in tobacco new agronomy farm, 1972
Series Title: Agronomy research report
Physical Description: 4 p. : ; 28 cm.
Language: English
Creator: Clark, Fred ( Fred A )
Wilcox, Merrill
University of Florida -- Agronomy Dept
University of Florida -- Institute of Food and Agricultural Sciences
Publisher: University of Florida, Agronomy Dept., IFAS
Place of Publication: Gainesville Fla
Publication Date: 1973]
 Subjects
Subject: Tobacco -- Florida   ( lcsh )
Weeds -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Fred Clark and Merrill Wilcox.
General Note: "March, 1973."
General Note: Some characters in Table 2 missing due to miscutting of page.
 Record Information
Bibliographic ID: UF00056164
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 69851567

Table of Contents
    Historic note
        Historic note
    Main
        Page 1
        Page 2
        Page 3
        Page 4
Full Text





HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida









Agronomy Research Report AG 73-4 March, 1973


CHEMICAL WEED CONTROL IN TOBACCO

New Agronomy Farm, 1972 /,

Fred Clark and Merrill Wilcox1

INTRODUCTION. Studies of chemical control of weeds iP 'f cured a were
continued in 1972 and the results are reported in this 'r/,A general dis-
cussion of the problems associated with chemical weed contCol, ~?Ltobacco was
presented in Agronomy Mimeo Report AG 68-8, January, 1968. 'Of -

MATERIALS AND METHODS. The soil type used was Jonesville-Hernando fin d,
containing approximately 2.2 percent organic matter. Fourteen chemical treat-
ments and one check, or untreated plot, were included, using three replications
for each treatment. Thirteen treatments were applied preplant on April 4, using
26 gallons of water per acre for each treatment. A calibrated hand sprayer
equipped with a pressure regulator in the discharge was used to spray the plots.
The treatments were incorporated to a depth of 2.5 inches within one hour after
application by means of a rototiller leaving a smooth soil surface. Hicks Broad-
leaf variety was planted April 5. Four postplant treatments were applied pn
April 6, immediately following transplanting, by spraying over the tops of the
plants.Three of these treatments were applied to plots which previously had
been treated preplant. Application rates are expressed in terms of the chemical
name listed in Table 1.

Each plot consisted of four rows spaced approximately 40 inches apart and
forty feet long. An application of 1000 lb 4-8-12 fertilizer per acre was made
before planting, and another of 150 lb of a 13-0-44 nitrate of potash side-
dressing per acre was applied two weeks later.

Weed control and plant vigor ratings were made of three replications inde-
pendently on May 18, and averaged. Vigor ratings are a linear estimate of aver-
age above-ground growth per plant, with 10 indicating normal growth. Crop stands
were not rated, as no differences were apparent. The weed control ratings are a
linear estimate of the average weed population in the plot. A rating of 10 re-
presents 100% control; G.0 of higher is considered commercially acceptable weed
control. All plots were plowed June 1. The tobacco was harvested June 20, and
July 6 and 21. After curing, the tobacco was weighed and sampled for grading
which was done by officials of the grading and market service of the U.S. Depart-
ment of Agriculture.

RESULTS AND DISCUSSION. All data are presented in Table 2. Yields were quite
satisfactory for most treatments.


1 Agronomist and Associate Professor, respectively, Gainesville.







Pace 2



The combination of R-7465 plus EI-179 plus pebulate resulted in the high-
est weight and dollar yields. R-7465 alone and other combination treatments
involving the same herbicides provided most of the better performances in the
test.

Most of the treatments described here are not approved for use by growers
and require further evaluation. Growers should consult the Agricultural Exten-
sion Service for recommendations.


















Table 1.

Chemicals Used in These Studies


Abbreviation


A-820

Benefin

Diphenamid

EL-179

IMC 3950

MBR 8251

Pebulate

R-7465

U-27267

Vernolate


Chemical Composition


N-sec-butyl-4-tert-butyl-2,6-dinitroaniline

N-butyl-N-ethyl-a,a,a-trifluoro-2,6-dinitro-p-toluidin

N,N-dimethyl-2,2-diphenylacetamide

2,6-dinitro-N,N-dipropylcumidine

S-(4-chlorobenzyl)-N,N-diethylthiolcarbamate

4-phenylsulfonyltrifluoromethanesulfono-o-toluid ide

S-propyl butylethylthiocarbamate

2-(l-naphthoxy)-N,N-diethylpropionamide

To be released later.

S-propyl dipropylthiolcarbamate






Table 2
Tobacco Weed Control, Newberry Road
Gainesville, Florida 1972


Weed Control Ratings2
Pounds Price
Rate Time of Cyperus Eleusine Digitaria Richardia Galium per/A per Value
Herbicide Ib/A Application rotundus indica sanquinalis scabra aparine 100 wt $per/A


BR 8251
MC 3950
-820
-27267
-7465+pebulate
L-179+pebulate
-7465+E1-179+pebulate
-7465
-7465
iphenamide
L-179+vernolate+diphenamide
ebulate+diphenamide
L-179+pebulate+diphenamide
enefin+vernolate+diphenamide
heck


3
1.5
1.5
1+4
1.5+4
1+1 .5+4
2
3
4
1.25+1.5+4
4+4
1.25+2+4
0.75+1.5+4


PPI
PPI
PPI
PPI
PPI
PPI
PPI
PPI
PPI
POT
PPI,PPI,POT
PPI,POT
PPI
PPI,PPI,POT


Preplant incorporated (i.e. PPI), treated April 4, 1972, incorporated to 2.5-inch depth in one hour. Planted with Hicks
Broadleaf variety April 5, 1972. Post-plant (i.e. POT), treated April 6, 1972 over the tops of the plants.

See text for explanation of ratings. Ratings taken on May 18, 1972.

: An average of only two replications was available because of variable weed stands.
'-*A rating of only one replication was available because of variable weed stands.

Tobacco fertilized with 1000 pounds of 4-8-12 per acre before transplanting and 200 pounds 13-0-44 top timer was applied
2 weeks later. Harvested June 20, July 6, and July 21.


The tobacco was cultivated June 1, 1972.-


65*
55*
60*
37
95*
60**
80*
53
60*
90*
90*
85*
80*
97*
0**


40**
25*
100*
75*
100*
100**
100*
100
100*
100*
100*
100*
100*
100*
0*


63
40
93
60
87
83
100
100
87
100
100
100
100
100
0


858
888:
1233
1261
1180
1437
1566
1327
1448
1103
1094
1377
1350
1379
826


86.0
86.5
86.0
86.8
86.4
86.6
86.5
86.6
86.9
86.6
87.2
86.8
86.8
86.5
86.6


737
769
1066
1094
1019
1245
1355
1149
1258
955
954
1195
1172
1193
716


-- ---




University of Florida Home Page
© 2004 - 2010 University of Florida George A. Smathers Libraries.
All rights reserved.

Acceptable Use, Copyright, and Disclaimer Statement
Last updated October 10, 2010 - - mvs