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Post by randy on Jul 7, 2019 20:43:20 GMT -6
To follow up from the old site because I don't want to argue with Brook. Bigfoot, unless you have added nitrogen in the last 90 days before a frost and also the plant has been stressed by drought, my feeling is the Johnson Grass is of no danger. In rotational grazing I always have some. Stress is what causes the purssic. Cutting it can cause the stress and new growth when its stressed can kill cattle |
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Post by bulltrader on Jul 7, 2019 20:44:58 GMT -6
To follow up from the old site because I don't want to argue with Brook. Bigfoot, unless you have added nitrogen in the last 90 days before a frost and also the plant has been stressed by drought, my feeling is the Johnson Grass is of no danger. In rotational grazing I always have some. Stress is what causes the purssic. Cutting it can cause the stress and new growth when its stressed can kill cattle But if I understand correctly it must have had nitrogen added before it's an issue. Is that correct? |
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Post by randy on Jul 7, 2019 20:50:40 GMT -6
No nitrogen has nothing to do with prussic acid, two different things all together Kenny.
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Post by kentuckyguy on Jul 7, 2019 20:57:39 GMT -6
I have let the cows graze Johnson grass late in the year several times. As long as you aren’t in a drought or it hasn’t been recently frosted it’s no issue.
I welcome Johnson grass here. It produces a lot of hay even when the weather gets too hot and dry for anything else to grow. I plan to send in some hay samples after I get it rolled up this year. I’ll be sure to post.
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Post by randy on Jul 7, 2019 20:59:48 GMT -6
I have let the cows graze Johnson grass late in the year several times. As long as you aren’t in a drought or it hasn’t been recently frosted it’s no issue. I welcome Johnson grass here. It produces a lot of hay even when the weather gets too hot and dry for anything else to grow. I plan to send in some hay samples after I get it rolled up this year. I’ll be sure to post. The prussic will go away in hay. Hay is never a problem with Johnson grass. |
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Post by bulltrader on Jul 7, 2019 20:59:50 GMT -6
No nitrogen has nothing to do with prussic acid, two different things all together Kenny. Ok, guess I need to go back to reading. |
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Post by fence on Jul 7, 2019 21:01:04 GMT -6
No nitrogen has nothing to do with prussic acid, two different things all together Kenny. This is correct. Prussic acid devlopes during recovery from stress. In new growth. Nitrate poisoning is from high nitogen levels and stress. To different things. A developing seed head is a good sign all is well. |
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Post by randy on Jul 8, 2019 4:28:48 GMT -6
No nitrogen has nothing to do with prussic acid, two different things all together Kenny. This is correct. Prussic acid devlopes during recovery from stress. In new growth. Nitrate poisoning is from high nitogen levels and stress. To different things. A developing seed head is a good sign all is well. Prussic acid will dissipate when cut for hay. Nitrogen will not. |
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Post by tcranch on Jul 8, 2019 6:37:56 GMT -6
I have let the cows graze Johnson grass late in the year several times. As long as you aren’t in a drought or it hasn’t been recently frosted it’s no issue. I welcome Johnson grass here. It produces a lot of hay even when the weather gets too hot and dry for anything else to grow. I plan to send in some hay samples after I get it rolled up this year. I’ll be sure to post. The prussic will go away in hay. Hay is never a problem with Johnson grass. We have a lot of Johnson grass and the cows love to graze it but won't touch it in bales - too stemmy. We shut off the pastures that are primarily Johnson grass any time it's potentially stressed and so far no problems. |
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Post by okie on Jul 8, 2019 6:50:17 GMT -6
I know an intensive grazer here that seeds it on purpose. He said he's been doing it the same way for fifteen years and has not once had a problem. He moves cattle twice a day so I imagine if it were ever going to be a problem he's know pretty quickly.
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Post by randy on Jul 8, 2019 7:12:15 GMT -6
The prussic will go away in hay. Hay is never a problem with Johnson grass. We have a lot of Johnson grass and the cows love to graze it but won't touch it in bales - too stemmy. We shut off the pastures that are primarily Johnson grass any time it's potentially stressed and so far no problems. The problem with johnson Grass is it out grows any thing else in a hay field. So it winds up to mature when every thing else is just right. Cut at the right time your cows will eat it. |
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Post by Allenw on Jul 8, 2019 9:35:49 GMT -6
If they're used to it they aren't as likely to have problems with johnson grass.
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Post by fence on Jul 8, 2019 10:08:53 GMT -6
If they're used to it they aren't as likely to have problems with johnson grass. A good point. The rule around here is once you put them on it you leave them. Don't keep pulling them on Unlessand off. you get light frost. Or you get rain after a severe dry spell. You can leave them in drought stressed grass. It's when the rain comes you need to take them off for a couple weeks. |
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Post by tcranch on Jul 8, 2019 12:46:48 GMT -6
We have a lot of Johnson grass and the cows love to graze it but won't touch it in bales - too stemmy. We shut off the pastures that are primarily Johnson grass any time it's potentially stressed and so far no problems. The problem with johnson Grass is it out grows any thing else in a hay field. So it winds up to mature when every thing else is just right. Cut at the right time your cows will eat it. Exactly! What isn't in dedicated pastures grows primarily around the perimeter of the brome & Bermuda fields but sprouts up randomly so can't really cut it. We spot spray in addition to having the fields sprayed but still can't get ahead of it. Majority of the bales are fine and we just roll out the ones with a lot of Johnson grass so they can pick through it. |
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Post by Allenw on Jul 8, 2019 13:08:11 GMT -6
Any concerns about johnson grass early in the spring when first coming up? I have a couple places I would like to winter some cattle and graze out in early spring and summer that has a large amount of johnson grass.
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