Question for the Roundup-Ready Soybean farmers...

[greg273]

The soybeans around here are getting their 'Roundup' herbicide treatment, and I've noticed after the sprayings how burned up the plants look.... Are these particular farmers using too high a concentration, is the 'Roundup Ready' gene showing natural variability, or is this just normal? Seems to happen every year, some fields worse than others.

[DaleK]

I think what you're seeing is the weeds dying out of the mix and making the whole field look a bit brown or yellow-tinged as a result. As the weeds drop and the beans grow it should green up again fast

[ksfarmer]

Originally Posted by DaleK

I think what you're seeing is the weeds dying out of the mix and making the whole field look a bit brown or yellow-tinged as a result. As the weeds drop and the beans grow it should green up again fast

Yep. The beans (or corn) don't change color. Dying grass and weeds in the field will give it this appearance till the crop grows above it

[rambler]

The broad leaves in soybean fields of the south have some resistance to roundup these days.

Many farmers are using one spray of roundup, and another spraying of something else, instead of 2 times with roundup.

Basigran, cobra, and a few other bean herbicides will 'fry' the beans and make them look terrible for a week or so.

This is a short term condition and does not hurt bean yields. As bad as it may look!

In fact, in high- fertility ground in the south, soybeans tend to grow tall and lush and not get beans put on. A high rate of Cobra will beat up the soybean, stunt it's vegetative growth, and kick in the bean pod setting stage, increasing yields 5-10 bu an acre even as bad as it looks to the crop.

Anyhow, I suspect you are seeing one of these products burning the leaves of the soybeans, if they are turning a shade of brown or bronze?

If a person uses about the max rate of roundup, and/or you add some crop oil in the spray mix, you can cause roundup flash - the beans will turn a light yellow almost whitish color for a few days. Again, it does not hurt yields, as odd as it looks. Weather changes when you spray can affect this too.

Of late, soybeans get many mold and fungus diseases, as well as iron clarousis. These are worse in high- ph soil conditions like I have. Often these diseases set in just about the same time a person sprays, tho has no connection to the herbicides.

If the beans look a shade of bronze, I'd guess you are seeing Cobra or Basigran burn.

If yellow light green color, could be roundup flash.

If they look stunted and off green often following a soil type in the field, I'd guess a disease or mineral shortage.

Paul

Wow, between my spelling and this iPad trying to correct things and my fat fingers on the keypad.......

[AngieM2]

I have left the topic of this post and the discussion about it. Please do not try to hijack it again.
We've seen all those arguments and they do not apply to this question.

[Paquebot]

Originally Posted by rambler

Of late, soybeans get many mold and fungus diseases, as well as iron clarousis. These are worse in high- ph soil conditions like I have. Often these diseases set in just about the same time a person sprays, tho has no connection to the herbicides.

Wow, between my spelling and this iPad trying to correct things and my fat fingers on the keypad.......

You didn't do too bad but it's iron chlorosis rather than iron clarousis.

Martin

[rambler]

You shoulda seen the mess before I edited it to straighten things up.

I knew that was wrong, me and the iPad fought on it a while, we finally compromised on leaving it spelled that way, figured you all could work it out from that. Thanks for getting it right.

Paul

[Lazy J]

No burn if they are using only Glyphosate. I bet they are using another herbicide or a high level of crop oil that might burn the leaves.

[ksfarmer]

Haven't seen Cobra used around here. I know there is one herbicide used here on grain sorgum (milo) which makes it look terrible for a week or so. Turns the leaves brown and burnt looking till it makes some new growth. Doesn't seem to affect the crop long term though.
I retired about 5 years ago and there have been lots of changes in chemicals used since then. I kept up with the changes for over 50 years, don't need to now. Let the young guys do it, my old brain is tired. LOL.

[rambler]

The key is what color they turned.

Dull bronze brownish, its an old chemistry, not roundup. I think the local retailers were pushing Basigran this year, Cobra is more common in the south. Even Fexstar will so etimes lightly brown the beans sometimes.

If they are a bright whitish lime green, then could be a crop oil/ NIS/ nitrogen with roundup flashing.

Paul

[greg273]

Ok, thanks for the replies. Its certainly not 'dead weeds' in the field, it is most definitely the beans that got burned. And rambler, the bronze color you described is pretty close to what I am seeing... bronze/brown color, crinkled leaf edges... I'l check in a few days and see if they are growing out of it. Thanks again.

[Bearfootfarm]

They may have used something other than Roundup if they have resistant Pigweed in the field.
The beans will come back, since they have months still to grow