The Rural Voice, 1997-11, Page 10"WE GET TOP
PERFORMANCE
IN HEAVY
FALL PLOWING"
THE GOODYEAR
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Owen Sound 376-3520
GOO•D YEAR
6 THE RURAL VOICE
Scrap Book
Drift free spray boom developed
Reduced rates of herbicides
yielding better results? It's possible
says Ralph Brown of the School of
Engineering, University of Guelph.
It takes a careful match of the
herbicide to the problem weed, good
timing, and uniform coverage, says
Brown, and a prototype shrouded
boom sprayer that promises near
drift -free application will make a
little spray go a long way.
Brown says that label rates of
active ingredients for herbicides are
somewhat higher than actually
necessary, but with good reason.
The rates provide a margin to
compensate for less -than -ideal
weather, crop conditions, weed
growth stage and sprayer
performance.
Brown undertook a two-part
study to determine how much less
product could be used if manage-
ment practices were improved.
The first study used three
application rates (100, 75 and 50
per cent) with translocated and
contact chemicals on corn and
soybeans, respectively. In the corn
trials, full control was possible with
50 per cent active ingredient where
weeds were ranked as "excellent"
for susceptibility, but control was
reduced for weeds ranked as "good"
susceptibility. At the 75 per cent
rate, all weed control was good and
grain yield was not significantly
different. Results followed a nearly
identical pattern in soybeans.
However, in both trials it was found
that the contact herbicides worked
best at full volume of spray solution.
In the second part of the study a
walk-in wind -tunnel was used to
design a windproof shroud for a
boom sprayer. The most effective
prototype developed was a porous
(rather than solid) baffle or hood.
The prototype was tested in the field
on corn and soybeans, using the
same contact and translocated
products, different nozzles, reduced
rates and several volumes, but
applied at moderate and high wind
conditions. Drift was minimal.
The best results were with the
translocated chemicals using the
shrouded boom under adverse
conditions. Researchers plan to
design a boom to retrofit
commercial sprayers that is lighter
and easier to manufacture.°
—Source: Agri food Research in
Ontario
Cows' diet change could mean healthier milk
Dairy cattle fed on pasture produce far higher concentrations of conjugated
linoleic acid, (a substance that prevents cancer and heart disease and regulates
metabolism in laboratory animals), than cows fed conventional rations,
University of Wisconsin researchers have found.
However, the researchers report that milk from cows whose dry -lot rations are
supplemented with soybean oil or linseed oil shows similar increases in the
health -supporting linoleic acid, also referred to as CLA. Researchers want to
learn more about the effects of diet on the production of cows' milk and also
.CLA's potential benefits for human health.
Research has shown CLA reduces the percentage of body fat in mice, rats
and chicks while increasing tissue and bone density. However researchers do not
yet know if manipulating the diets of cows to produce more CLA will have an
effect on humans. "What is not known is if there is a threshold level of CLA in
the diet of people for the benefits that are seen in laboratory animals," said Larry
Satter, director of the United States Dairy Forage Research Centre in Madison,
Wisconsin. However Satter said he is optimistic it can be shown that increasing
CLA in milk may benefit human health. He said three eight -ounce glasses of
whole milk per day from cows fed on a CLA-promoting diet could provide one-
fifth the amount of CLA that is proposed to be used in human clinical trials.
In his experience, Satter found the level of CLA in milk increased an average
of four or five times in cows that ate only grass. They were able to get the same
kinds of results by feeding soybean oil at 3.6 per cent of the diet but not by using
roasted soybeans, cracked soybeans or linseed oil.°
— Source: Western Producer