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hippydave:
You can in fact plant as soon as the spray has dried as it has no residual affect and is broken down in the soil quite quickly.

cambourne7:
While i am sure the danger has gone you could dig a trench and backfill with clean soil and plant into that.

Obelixx:
Squeezy - your perennials will be affected by fine spray drifting over.  Glyphosate works thru the leaves and is passed down to the roots.  Doesn't work on none green tissue.  Next time you see your neighbour spraying ask him to make sure the wind is not blowing in your direction or else get out there straightaway and rinse all your foliage before the glyphosate has time to be absorbed.

As far as re-planting goes, yes it is "inert" on contact with soil and won't kill new plantings but it has been shown that it does leach down thru soils and into waterways where it is having and adverse effect on some waterways.  It has also been linked to higher concentrations of cancer and birth defects in areas that use a lot so France has banned it completely.  I haven't yet explored the alternatives and we're trying to tackle pernicious weeds by barrier methods and constant vigilance.

Vinlander:

--- Quote from: squeezyjohn on May 22, 2018, 14:19:56 ---I don't buy this claim that glyphosate becomes inert on contact with soil. 

--- End quote ---

It goes against the grain to compliment a weedkiller, but I have some reason to think it does become ineffective on contact with soil (but not necessarily safe for us).

I used to use glysophate and once made the mistake of diluting it with water from the dipping tank (which has lots of soil bacteria - especially from people who endlessly and ostentatiously wash the soil off their crop roots).

It did absolutely nothing when I sprayed it on my weeds - but the same stuff made with tap water was very effective. The weather in both cases was 100% dry (effectiveness varies between 0% and 100% in inverse proportion to how much and how soon rain falls after application).

Spray drift however is always 100% targeted at the next plot and 100% fatal (because of Murphy's Law), plus the fact that all weedkillers are 100% effective against all crops despite being 100% useless against many weeds.

I also think the 'cide companies have so many ways to pull the wool over our eyes* without having to say something that is so easy to disprove - even the "Lie Big " method fails on this one...

* I recommend Ben Goldacre's book "Bad Science" as an antidote to this kind of flim-flam and far worse excesses. A summary of the book in my words would be:

"1) It's so easy for 'big chem' and 'big pharm' companies to cloud and manipulate results using highly talented, highly specialised teams of highly mercenary 'scientists' and statisticians.
2) No medical professional (with a proper day job helping people) has the time or expert specialised statistical knowledge to check them out.
3) The only answer is to have a college of equally dedicated and talented people paid to debunk trials".

Think loss adjusters and loss assessors, or prosecution and defence (probably the other way around).

Cheers.

brownthumb2:
 I planted my sweet corn two weeks after the weed killer was used  they were a little root bound as they should have gone in earlier and took a little while to get  going but growing good  I  don't think  I would have fancied planting root crops  in the same area but thought it ok to plant sweet corn 

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