Re-spraying glyphosate

[Durrus]

Looking for a little advise if I may,

I sprayed a field with glyphosate prior to cutting for silage about 6 weeks ago ( when there was some grass!!) with the intention of sowing grass seed.
Needless to say we didn't go ahead due to the drought but after finally getting some rain and the forecast looking a little better I hope to get going again.
In the meantime the field has obviously greened up a little with weeds, so my question is, will a half rate of glyphosate be sufficient for a final kill and can I start tilling within the week once the chemical gets to the roots, as I need to get this field back into production ( weather permitting of course!!!)

TIA.....

 

[Still Farming]

Read product label.
Will give maximum per ha per crop /yr.etc.etc.

 

[neilo]

Looking for a little advise if I may,

I sprayed a field with glyphosate prior to cutting for silage about 6 weeks ago ( when there was some grass!!) with the intention of sowing grass seed.
Needless to say we didn't go ahead due to the drought but after finally getting some rain and the forecast looking a little better I hope to get going again.
In the meantime the field has obviously greened up a little with weeds, so my question is, will a half rate of glyphosate be sufficient for a final kill and can I start tilling within the week once the chemical gets to the roots, as I need to get this field back into production ( weather permitting of course!!!)

TIA.....

Yes. That’s my standard routine when coming out of long term pp now, if I need it clean. I usually go in initially with a full rate of 5-6 L/ha of glyphosate 360 (+ conditioner/acidifier), then leave for a month or so and repeat at 2-3l/ha to take out seedlings/weakened regrowth. It makes a far better job of cleaning up old grass species IME. The only time I wouldn’t follow that protocol now, was if it was going into summer brassicas, giving a second chance to hit the grass weeds later on instead.

Assuming it’s just light regrowth, a few days wait after the second spraying would be plenty, as long as you are spraying green, growing stuff of course (so rain dependant). A bit longer if the weeds are drought stressed and not growing much.

 

[ed_wod]

I've in the same situation here. I just tried to ring an agronomist to ask a similar question. The bottle just has a dash next to the number of applications/year for burning off grass, so I assume it is ok to go for a 2nd round. I am direct drilling so I also wanted to check whether I needed to wait between spraying and DD.

If I get a call back from him I will let you know!

 

[Pan mixer]

There is a 'cap' on the amount of a particular type of Glyphosate that you can use in any one year iirc, you can of course buy another brand and put some more on.

4 L per ha first dose here and another 2 for seedlings pre-drilling.

 

[JD-Kid]

alot of. guys doing. 2 sprays here
first. spray. go in with roundup and a flat weed spray then follow up with round up pre drill
some I know round up first. hit. then 14 days before drilling. go in with round up with granstar for. flat weeds
big thing is. get a good kill first time round and 2nd spray should just be taking out. new growth and seed strike

 

[Longlowdog]

As far as I was told on my sprayer course, there is no max limit for applying Glyp' as it is made inert when dry and broken down by soil bacteria. It's so cheap that playing with sub-recommended doses seems like tempting fate to me. Buy well cry once, cut corners cry twice.

 

[ed_wod]

I've in the same situation here. I just tried to ring an agronomist to ask a similar question. The bottle just has a dash next to the number of applications/year for burning off grass, so I assume it is ok to go for a 2nd round. I am direct drilling so I also wanted to check whether I needed to wait between spraying and DD.

If I get a call back from him I will let you know!

Advice was full rate for the 2nd dose and wait 7 days before cultivation as in these dry conditions it takes a lot to kill the regrowth.

 

[neilo]

Advice was full rate for the 2nd dose and wait 7 days before cultivation as in these dry conditions it takes a lot to kill the regrowth.

Serviced agronomist?

 

[ed_wod]

Serviced agronomist?

Yep. First time doing this, so happy with the advice and seems to go with other recommendations I've seen.

 

[neilo]

Yep. First time doing this, so happy with the advice and seems to go with other recommendations I've seen.

'Full rate' = higher sales. As long as your aware of that, and happy to pay for it to get the advice, then no problem. Tbh, contrary to popular opinion on here, it can work out as cheap advice in the grand scheme of things, particularly if only on a limited acreage/chemical usage.

 

[james ds]

'Full rate' = higher sales. As long as your aware of that, and happy to pay for it to get the advice, then no problem. Tbh, contrary to popular opinion on here, it can work out as cheap advice in the grand scheme of things, particularly if only on a limited acreage/chemical usage.

We sprayed off 150 acres last autumn , got a great kill , but the spring was so wet we couldn't reseed it , it greened up by mid May and the owner gave it another 1.5 lt , but it didn't work , complete waste of money , he should have gone with full rate.

 

[JD-Kid]

We sprayed off 150 acres last autumn , got a great kill , but the spring was so wet we couldn't reseed it , it greened up by mid May and the owner gave it another 1.5 lt , but it didn't work , complete waste of money , he should have gone with full rate.

how much cover on it at the time
1.5 would be too low unless. spraying only a month or 2 after. first spray

 

[james ds]

how much cover on it at the time
1.5 would be too low unless. spraying only a month or 2 after. first spray

Not much , it had just started to green up , was completely brown at the end of March.

 

[neilo]

how much cover on it at the time
1.5 would be too low unless. spraying only a month or 2 after. first spray

+1
1.5L is a very low rate indeed, not enough for much more than seedlings IMO.

 

[ed_wod]

'Full rate' = higher sales. As long as your aware of that, and happy to pay for it to get the advice, then no problem. Tbh, contrary to popular opinion on here, it can work out as cheap advice in the grand scheme of things, particularly if only on a limited acreage/chemical usage.

 

[JD-Kid]

+1
1.5L is a very low rate indeed, not enough for much more than seedlings IMO.

even then. could be a bit hit and miss
interesting was. a write up in Ozzie years ago. all things being right a bit over a Lt. per ha. would take out. ryegrass but. hot dry. dusty stress etc etc. it needed. alot more to do the same job
heard of a spray top job done on a dairy farm at about 1/2 a lt and it took out every thing moon and stars must of been right that day

 

[neilo]

even then. could be a bit hit and miss
interesting was. a write up in Ozzie years ago. all things being right a bit over a Lt. per ha. would take out. ryegrass but. hot dry. dusty stress etc etc. it needed. alot more to do the same job
heard of a spray top job done on a dairy farm at about 1/2 a lt and it took out every thing moon and stars must of been right that day

I DD’ed a Field last week that had5L/ha of Kyleo in early May, then 3L/ha of 360 glyphosate (+ water conditioner) and still the clover’s growing back. Not particularly worried about a bit of clover in the bottom, but everything else is wiped out nicely.
Still a few seedling weeds coming up with the turnips though.