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Superintendent
David Davis
21262 Genoa Road
Linneus, MO 64653
Phone: 660 895-5121
FAX: 660 895=5122
Email:
DavisDK@missouri.edu
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October 1, 2001
Forage Systems Update
Vol 10, No. 4
Field Notes from Valerie Tate
We have initiated a winter pasture establishment/pasture renovation
study at FSRC. We began with a tall fescue-clover pasture, with the
intent of renovating the pasture by using a winter annual forage to
aid in smothering the existing fescue stand. We used several
herbicides to suppress the standing forage and then seeded plots
with several winter annual forages. Use of any of these products
does not reflect an endorsement of any of these products by the
University of Missouri. Six herbicide treatments were used and seven
seeding treatments were no-till drilled into the killed sod.
Herbicide treatments included Gramoxone Extra and Roundup Ultra for
total burndown of all existing vegetation. Assure II, Fusion, Poast
Plus, and Select were used to kill the fescue, leaving the legumes
in the stand. All herbicide treatments except Gramoxone Extra were
applied on July 20, 2001 while the latter was applied July 30. All
herbicide treatments included recommended adjuvant. Plots were
seeded on August 3 and August 4 using a Kelley no-till drill.
Herbicide application rates and seeding rates follow:
Herbicide application and seeding rates for Pasture Renovation Study, FSRC 2001.
| Herbicide |
Rate |
Forage Variety |
Seeding Rate |
| Assure II |
10.0 oz./A |
Marshall annual ryegrass |
25 lb/A
|
| Fusion | 12.0 oz./A | MO-1 annual ryegrass | 25 lb/A |
| Gramoxone Extra | 24.0 oz/A | Barmultra Italian ryegrass | 25 lb/A |
| Poast Plus | 48.3 oz/A | Cereal rye | 90 lb/A |
| Select | 6.0 oz/A | Cereal Rye+ Marshall | 50 lb/A + 15 lb/A |
| RoundUp Extra | 63.3 oz./A | Forage oats | 50 lb/A |
| | | Cereal oats | 50 lb/A |
The sprayed treatments have been assessed twice; at three-week intervals to
determine percent green cover, percent legume cover and percent fescue
kill. These measurements are visual estimates of those parameters,
and are independent of each other. Percent green cover visually estimates
the ground cover by living species, as opposed to bare ground or dead
thatch. Percent legume cover estimates the percentage of the ground
covered with a desirable legume species. Percent of fescue kill estimates
the percentage of fescue killed by the herbicide treatment. Percent
cover by seeded species was visually estimated on September 20, independent
of the two previous observations. Preliminary results from these measurements
follow.
Initial Degree of Control from Herbicide Treatments Used for Pasture Renovation
| Herbicide |
% Green Cover |
% legume cover |
% fescue kill |
| Assure II |
70.3 |
17.7 |
32.0 |
| Fusion |
74.5 |
12.3 |
18.3 |
| Gramoxone Extra |
17.5 |
5.3 |
82.7 |
| Poast Plus |
55.9 |
14.4 |
59.7 |
| RoundUp |
13.4 |
4.5 |
93.4 |
| Select
| 64.8 |
18 |
39.8 |
| |
Mid - September stand evaluation in Roundup and Gramoxone treated plots.
| Seeded Crop |
% stand roundup |
% stand Gramoxone |
Variety mean |
| Marshall annual ryegrass |
58 |
38 |
48 |
| MO - 1 annual ryegrass |
65 |
34 |
49 |
| Barmultra Italian ryegrass |
17.5 |
5.3 |
82.7 |
| Cereal rye |
55.9 |
14.4 |
59.7 |
| Cereal rye + Marshall AR |
13.4 |
4.5 |
93.4 |
| Forage oats
| 64.8 |
18 |
39.8 |
|
Cereal oat
| 59 |
37 |
48 |
|
Herbicide mean
| 45 |
29 |
|
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