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2-Plants: Herbicide mixtures needed on RR soybeans



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TITLE:  US extension specialist on yield of RR soybeans and the
        need of additional herbicides
SOURCE: Agronomy Notes, Mississippi State University
DATE:   June 3 + January 8, 1999

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Dear GENET-news readers,
after evaluating the first years of GM crop performance on the
U.S.-fields more and more data collected by independent
scientists and institutions show that many of the benefits
industry claims do not hold true. Below you find some remarks on
RR soybeans by an extention specialists od the Mississippi State
University published in Agronomy Notes
(http://www.ext.msstate.edu/newsletters/agronotes/).
The underlaying data can be reviewed at
http://www.mafes.msstate.edu/pubs/ib346contents.htm
(Caution: huge data files, not summarized!).

Yours,
Hartmut Meyer

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Agronomy Notes 
June 3, 1999

SOYBEANS
Dr. Alan Blaine 

[...]

Many producers have called about tank mixing with Roundup. If
morning glories are your major problem, .25 ounce of Classic
added to Roundup is a good option. In the case of other weeds,
base your decision on cost. In many instances, you are probably
better off just increasing your Roundup rate. This year has once
again reminded us that the best laid plans often do not work out.
Two things that come to mind are preemergence herbicides under
Roundup Ready soybeans and timing of spraying. I had someone tell
me the other day, they just could not understand why anyone would
use metribuzin under Roundup Ready soybeans. Well, I can think of
one good reason, and it is called "teaweed." Roundup needs some
help on some weeds, and teaweed is one weed not very difficult to
control with a pre herbicide. Another problem has been an ability
to spray when needed. I am reluctant to admit it, but we have had
to apply conventional herbicides on several Roundup Ready fields
because of windy conditions. Given the amount of problems many
have had spraying Roundup, pre herbicides will probably play a
much bigger role in the future.

[...]


Agronomy Notes 
January 8, 1999

SOYBEANS
Dr. Alan Blaine 

It seems just yesterday it was mid-August... but the year is
over. The growing seasons of 1998 were varied, but final yields
statewide are better than most expected. With many new options
coming to the forefront (new varieties, transgenics, new
herbicides, etc.), it is easy to overlook the basics of crop
production. Although the basics are not glamorous, they should
get a lot of attention. I have little doubt that if a grower
concentrates on a good soil testing program, choose varieties
carefully, and practice crop rotation, the grower could increase
profits. Do not underestimate these three inputs, all of which
are in your control. 

Groups IV, V, and VI of the Soybean Variety Trials are available
in your county Extension office. I encourage you to pick up a
copy and make your variety choices quickly. Varietal differences
are real. Use the variety trials as a guide; they are by no means
absolute. The best variety trial will always be the one conducted
on your farm. When evaluating varieties, consider your specific
problems or problem fields but above all, select those varieties
with a consistently high yield potential. 

Roundup Ready soybean crops have been big topics of conversation
this fall; discussions range from yield to weed control. As
producers enter the 1999 growing season, about as much confusion
exists today as it did before 1997. Some excellent variety
choices are available in Roundup Ready and conventional soybean
seed, but many Roundup varieties have been quite variable over
the last couple of years. Review as much varietal information as
you possibly can. Choose varieties adapted to your particular
soil type and those that will address any potential disease
problems. Select varieties that best meet your needs whether
conventional or Roundup Ready. After 2 years of large-scaled
planting of Roundup Ready varieties, a lot of mixed emotions have
surfaced. Although some good varieties are available, Roundup
Ready varieties, as a whole, have been much more variable in
yield and disease reaction. As you look at the variety trials, it
appears that not as much variability exists between Roundup Ready
and conventional Group IV's; however, this is not the case when
comparing the Group V's. Good high-yielding varieties are
available, but you will need to be selective to stay on top of
the best varieties. Nothing has changed regarding variety
selection.



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