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 Soybean
Podcasts
Potassium Fertilization Trends in Soybean
January 12, 2010
(2 minutes: 20 seconds)
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Audio/Video Script:
One other study on potassium that’s noteworthy, this has
been going on at our Pine Tree Branch Station since two-thousand, it’s rotated
with rice. Generally, we no-till it to keep from moving our treatments around
and we annually apply rates of zero to a hundred sixty pounds of K20 per acre
per year. And regardless of whether its rice or soybeans, every year we put out
optimal rates of all the other nutrients. So the only that that differs in this
test area is potassium, everything else is managed uniform.
This slide here shows the first year, two-thousand all the way to the current
year. The crop grown that particular year is shown below it. The potassium
fertilizer rate applied each year is shown in the left-hand side. And down here
at the bottom this summarizes here the maximum yield difference where we see
statistically significant differences between the unfertilized check and the K
rate that maximized yield.
One thing to note, the first four years of this study, there was only one
positive, significant response to K and it was in soybean the first year. The
second year we were in beans I think if we had a higher yield I think we would
have probably seen a significant difference there. And what I want you to focus
on is the fact that after four years of cropping, four years of depleting this
treatment right here the soil of potassium, look at what we are seeing, with
soybean 15, 22, 17 bushel differences and even if we move up to this lowest
rate, our yields improve quite a bit. That’s why, you know, usually when you
call and say I’m looking to cut out my fertilizer cause I can’t afford it, maybe
you can do that for a couple of years, but guys if you do it too long its gonna
come back to haunt you, so even using a sub-optimal rate is better than doing
nothing.
Your Arkansas Soybean Podcast is a production of the University of Arkansas
Division of Agriculture and was funded in part by the Arkansas Soybean Promotion
Board. For more information on soybean farming in Arkansas contact your local
county Extension Office.
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