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Old 06-13-2012, 05:34 PM
MinnesotaHunter MinnesotaHunter is offline
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Default Fertilizing soybeans?

My beans are about 3 inches tall and just wondering if it would be ok to spread a 9-23-30 granular fertilizer now? 70 percent chance of rain tomorrow.
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Old 06-13-2012, 05:45 PM
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Little late to be putting P & K down. It should have been applied last fall, or very early in the spring. If you put it down now you will get some use out of it next spring.
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Old 06-13-2012, 07:04 PM
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Quote:
Originally Posted by midwest_170 View Post
Little late to be putting P & K down. It should have been applied last fall, or very early in the spring. If you put it down now you will get some use out of it next spring.
Probably won't help you for this crop, but, sure, it's OK.

Here's a thought....

Pull a dozen 'bean plants, root and all. Look for little nodules on the root. If they are there, the plant is making it's own nitrogen. If not, the nitrogen in your fertilizer will provide a boost.
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Old 06-13-2012, 08:40 PM
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Be just fine. The P will not do much good this year, but the K will be where it needs to be before it is needed later this summer.
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Old 06-13-2012, 08:45 PM
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What was applied at planting ? Typically you only apply at planting for soybeans. You won't harm anything , but it won't help as much at this point.
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Old 06-13-2012, 09:21 PM
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I read a report on a Kentucky Soybean yield contest and virtually all of the top competitors supplemented with nitrogen. I think it can certainly help if you've drilled into killed sod or incorporated a cover crop with a high C/N ratio such as rye. It can also be beneficial if your beans are getting overbrowsed to give them a quick boost just to try to get them to survive.
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Old 06-13-2012, 10:03 PM
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I would recomend a liquid foliar fertilizer, the nutrients are available to the plant immediatly. Depending on what you use, you can put down micro nutrients at the same time as well.
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Old 06-13-2012, 10:52 PM
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I held back on fertilizing when I planted my beans. I was under the impression that some guys wait to see how their beans germinated before applying fertilizer. I figured that was a good idea too. I only have an acre of beans.

It is supposed to rain here in the next days....I have not seen my beans for about ten days...but they had sprouted before the last rains a few days ago. I guess they will be a few inches high now.

I planned to put down 6-24-30-8 (sulfur is the 4th digit). Are you guys telling me that broadcasting this fertilizer is wasting my time and dough?? (I will dig a few plants up to check for nodules - thanks for that idea.)

I had planned to broadcast this same fertilizer blend on my new Sainfoin plots too.
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Old 06-13-2012, 11:49 PM
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Default Only 30-50% of P and K used in the same year as applied..think residual fertility

Nay it is not time wasted but it is not the best timing for legumes, unless you are in an area commonly plagues with dormancy of say alfalfa.

The majority of what soys and sanfoin are dining on now is P and K etc from your past mgmt over the last 5 yrs. Legumes prefer high residual fertility but will also use some nutrients applied in-seaon. N and S will see plant uptake wihtin 6-8 weeks, some of the K will be taken up until the roots must dive deep for soil moisture/nutrient feeding, unfortunately most of the P is for next season.

This is one reason we prefer heavy fall applications and like to split soil samples, say 0-4" and 4-8". We want the nutrients down early and well entered into the soil cycles before peak crop growth and hopefully enough fall/winter rain for them to migrate down the profile. When 0-4" becomes dry and unable to feed a summer crop, then we want to know what the deeper reserves look like...sufficient or not?

I have some June 2 planted beans and July/Aug are normally droughty. Beans should be first trifoliate or better by this weekend with good prior soil fertility applied. It will be an opportunity to take a bag spreader and do some repliated AMS+muriate apps just to see if we can improve crop health/growth. The experts say I don't need S and K, but some of my testing and observations say otherwise. If we get more rain we will know if it works, if not then it is food for the soil and next crop!
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Old 06-14-2012, 06:02 AM
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Dgallow, I have to disagree with lumping P and K together like that. They are very different in how they move.

I'd be more likely to lump K with N, or maybe more accurately S. I have personally seen crops run out of K before the end of the growing season that had plenty applied at planting.

Even on sand P is slow moving, almost to the point of being immobile for short term use.

Then again, I am on a sandy soil. My CEC is only around 5 in most places. If you have a higher clay content they may be more similar in nature.
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Old 06-14-2012, 02:14 PM
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5 AM....did you read my reply before or after morning java...we do agree Carver and I will expand!

Quote:
The majority of what soys and sanfoin are dining on now is P and K etc from your past mgmt over the last 5 yrs. Legumes prefer high residual fertility but will also use some nutrients applied in-seaon. N and S will see plant uptake wihtin 6-8 weeks, some of the K will be taken up until the roots must dive deep for soil moisture/nutrient feeding, unfortunately most of the P (applied now) is for next season(s).

This is one reason we prefer heavy fall applications and like to split soil samples, say 0-4" and 4-8". We want the nutrients down early and well entered into the soil cycles before peak crop growth and hopefully enough fall/winter rain for them to migrate down the profile. When 0-4" becomes dry and unable to feed a summer crop, then we want to know what the deeper reserves look like...sufficient or not?

HERE where soil P levels were 10 lbs/ac in the top 6 " when we started, it has taken 3 yrs of suface application to get 40+ lb P/ac in the top 4" or 6" and 4-10" is still 10 lbs P/ac. So YES, P is a slow mover...7 yrs to build the 10" depth in silts and loams...forever in clay.

Now if one is low P coming into a crop, then the soil P sortion sites must be full 'loaded' in order to have enough plant available phosphate for that crop feeding....apps of 250 lbs of DAP or MAP will do this, but spring can be a tricky time to keep surface applied high phosphates from moving off the field....not something I want to see/risk!

K uptake is what one must consider in timely/effectively feeding of the soil and the plant....K being a regulator of plant water use efficieny. K is mobile in the plant...K uptake by root is via mass flow or interception. Get some K down early (in fall) so there is a 'reserve below 4" hopefully' in spring...and just ahead of the normal dry season some more K for 'luxury uptake' before soil does become dry!

Soy tissue results came back today showing the top 3 leaves at 2.90-2.97% K..so yes some luxury K uptake now and just ahead of July dryness...litter fall applied at 4T over cover crops....100 muriate went on 2 fields at planting but DID NOT change leaf K. 4-8" soil K will be the 'premonition' for deep root feeding...those results in a few weeks. Leaf S 0.29-0.31%...no S effect from AMS. N is 5.54 and 5.36% with AMS at planting and 4.94% with NO AMS...N is confounded because the NO AMS field is also first time in soy and nodulation may not be ideal (need to dig roots this weekend).

Again, our past fertility management last fall and the 3 yrs prior is feeding the 2012 crop, not our 2012 planting application (K and S for sure)! This is not my opinion but what the data indicates. Full results will be posted in the Project 2012 thread soon.

So YES we agree and I aplogize for not being clear earlier...all is good! Last year was rough, we were P and K leaf def in late June!
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SARE: Managing Cover Crops Profitably
http://www.sare.org/publications/cov...covercrops.pdf

Good white clover read: search for 'white clover'
http://pubs.caes.uga.edu/caespubs/pubcd/B1251/B1251.htm

Back-to-basics - fertilizer information
http://www.back-to-basics.net/home

Quality of Native Plant Forage Species Important to White-tailed Deer and Goats in South Central Oklahoma.
https://www.noble.org/global/ag/wild.../cdversion.pdf
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Old 06-14-2012, 04:51 PM
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Considering some confusion in this discussion perhaps the following slide show will help clear ther air...I am not good at explaining some of this...the information can be translated to legumes in general not just beans:

http://www.agtest.com/articles/soybeannutrient.pdf

Slide 36:

Quote:
Soybean Potassium Fertilization
�� The soybean crop seldom receives direct fertilizer
applications.
�� Soybeans respond to fertile soils.�� It is important to recognize the nutrient needs of the
crop rotation.
�� If the fertilizer has not yet been applied to the rotation
then it is prudent that the application take place
before soybean planting. Especially if the Soil K test
is below the target level.
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SARE: Managing Cover Crops Profitably
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Good white clover read: search for 'white clover'
http://pubs.caes.uga.edu/caespubs/pubcd/B1251/B1251.htm

Back-to-basics - fertilizer information
http://www.back-to-basics.net/home

Quality of Native Plant Forage Species Important to White-tailed Deer and Goats in South Central Oklahoma.
https://www.noble.org/global/ag/wild.../cdversion.pdf
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Old 06-14-2012, 08:13 PM
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LOL, must have been before. I knew you knew that, but didn't know that I couldn't read first thing in the morning.
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Old 06-14-2012, 10:53 PM
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Good! How is the sod doing? Bermuda is very spotty here, but with june rains we have a chance of getting some of the sward back. This will sound weird, but I am actually looking forward to plotting into bermuda.
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Good white clover read: search for 'white clover'
http://pubs.caes.uga.edu/caespubs/pubcd/B1251/B1251.htm

Back-to-basics - fertilizer information
http://www.back-to-basics.net/home

Quality of Native Plant Forage Species Important to White-tailed Deer and Goats in South Central Oklahoma.
https://www.noble.org/global/ag/wild.../cdversion.pdf
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Old 06-15-2012, 06:49 AM
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We had a late cold spell that really set it back, but it has finally come back strong. What are you planning to put on the bermuda (pasture I assume)? Beans?
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Old 06-15-2012, 01:15 PM
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When you say plotting into Bermuda, do you treat it with gly then notill or surface broadcast?

I have the fallow plots I treated with gly and I've got a notill, instead of broadcast I should no till into it right?
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