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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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hrcarver hrcarver is offline
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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
welder1 welder1 is offline
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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
foggy foggy is offline
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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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dgallow dgallow is offline
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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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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.
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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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