whats the soil pH?
if your below 7 you should be ok atlantis wise
Sounds like text book theory that doesn't actually happen in practice. Our soils are pH 7.5 to 8 but I don't see any better control from Atlantis or see problems in following crops. I suppose I don't have any acidic soil to compare it to though.http://extension.psu.edu/pests/weeds/control/persistance-of-herbicides-in-soil
Soil pH can influence the persistence of some herbicides, especially the triazines and sulfonylureas (see Table 1). Chemical and microbial breakdown, two ways herbicides degrade in soil, often are slower in higher-pH soils. In particular, the chemical degradation rate of the triazine and sulfonylurea herbicide families slows as the soil pH increases, particularly above pH 7.0. In addition, in higher-pH soils, lesser amounts of these herbicides are bound to soil particles, making more available for plant uptake. So in higher-pH soils, the triazine and sulfonylurea herbicides persist longer, and more is available for plant uptake. (Some triazine and sulfonylurea herbicides do not persist and carry over, regardless of how high the soil pH is.)
Low pH also can affect the persistence of both the triazine and sulfonylurea herbicides. Soil pH levels below 6.0 allow a more rapid dissipation of both these herbicide families. In acid soils, herbicides like atrazine become bound to soil particles, making them unavailable for weed control, but at the same time, they are chemically degraded more quickly. This makes liming an acid soil important for achieving an adequate performance from these two herbicide families.
Has all your wheat this year been sprayed with atlantis? If you have a smaller area for OSR this year would it not be easier just to swap fields. Hopefully the chemical will have degraded away ready for the spring crop.
Most chemical labels state to plough to 6" or more if they anticipate a problem with residue. I assumed it was the physical burial with a plough that is important not just the cultivation? A lot of osr is sown with very minimal cultivation after these chemicals so I am probably wrong.
Sounds like text book theory that doesn't actually happen in practice. Our soils are pH 7.5 to 8 but I don't see any better control from Atlantis or see problems in following crops. I suppose I don't have any acidic soil to compare it to though.
Thanks Doorknob, very interesting. Never occurred to me before, but makes perfect senseIn dd/no-till, soil C.E.C. (cation exchange capacity) is a very important soil make up characteristic to always consider when applying fertilizers and chemicals. Especially residual chemicals.
The "Exchange Capacity" is not applied to nutrients only. It applies to pesticides too. It should be part of any dd/no-till treatment program, but seldom is. IMO.
Here's but one simple video on the subject.
Don't wine. Don't follow the Clearfield route.Now looks like the clearfield seed I ordered is not available
Maybe a sign to just sow some from the heap and see if I have a crop in the spring ??