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Implement Alley Discussion Forum

Re: Planting soybeens with JD 7000

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11-24-2012 08:28:28

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Yield on the alfalfa field was around 1.5 ton due to drought. had the ground soil sam pled this past week waiting for results. I was told that after 4 years the alfalfa poisons the ground so you should rotate. Is this not true?

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11-24-2012 13:14:20

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 Re: Planting soybeens with JD 7000 in reply to mauricew, 11-24-2012 08:28:28  
An alfalfa plant over 1/2 or 1 year old will be putting toxins in the soil that usually kill any new alfalfa seed trying to sprout that is within 18-24 inches of the old plant.

So you cannot plant new alfalfa seed into a field that has old alfalfa plants growing in it.

After 3 moths of good growing weather and _no_ living alfalfa plants, those toxins go away. But most folks feel better waiting a full year of some other crop befroe replanting alfalfa - it is difficult to kill off every old alfalfa plant quickly.

Both alfalfa and soybeans are legume plants, in the same family. So you use some of the same herbicides, and they are subject to a few of the same diseases/ insects. Both beans and alfalfa use up P and somewhat K, and produce excess N, so they are the same, not complementary on fertilizer use.

If corn is a good crop in your area, like I said below, it would be grass crop, easier to control weeds, insects, and diseases, uses the build up N you have in the ground, and in most places, it pays off better than beans - tho yes it does take more money to get it growing.

Don't know where you are located so don't know which crop is right for you, but in most situations corn is a much better crop behind 4 year old alfalfa than beans would be.


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11-24-2012 09:36:11

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 Re: Planting soybeens with JD 7000 in reply to mauricew, 11-24-2012 08:28:28  
Absolutely not true. I know of another stand that is 12 years old and producing over 4T in an average year. Again, hit heavy with p&k every year. What happens in an old stand is clover and grasse begin to invade. If you are feeding it yourself that shouldn't be a problem. Alfalfa "poisoning itself" occurs if you try to reseed into an existing stand. It is called autotoxic, and also occurs if you were to try to plant new alfalfa on a previous afalfa crop. So when you do burn it down you follow with corn. We had a couple days in the high 60's a week ago and there is new green growth at the bottom of the plants. The deer are pounding it. I wonder if that will damage it.

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Nathan (SD)

11-24-2012 16:27:08

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 Re: Planting soybeens with JD 7000 in reply to GordoSD, 11-24-2012 09:36:11  
Gordo.The tonnage is still there but I bet the alfalfa stems look like soybean stalks. I bet the TDN is way down with a stand that old.

For beef hay that is fine. Dairy guys want high TDN. Just depends on your needs.

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11-26-2012 16:03:06

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 Re: Planting soybeens with JD 7000 in reply to Nathan (SD), 11-24-2012 16:27:08  
Do I need to test for TDN if I have the RFV?

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