Allelopathy

[Hartwig]

Here`s a research article about allelopathy, unfortunately it`s in german, so might be useless for most of you ....

http://www.pflanzenforschung.de/index.php?cID=10651

The basic message is, that grasses like wheat are releasing rhizosphere-exudates with a specific chemical structure which belong to the group of DIBOA and DIMBOA (you can spot the chemical name in the text then) which get metabolized to APO and AMPO. Researchers compared the herbicidal effect of APO with Pendimethalin and found out that APO is more effective !!

That`s what my observation is already since some years when I grow spring beans without broadleaf herbicides - just DDed into an oats covercrop, some glyphosate to get rid of any AMG (maybe not even needed after Strigosa) and a late graminicide before row closing, job done and the field is cleaner comes harvest than neighbouring field same treated but without the oats CC but with a full dose of pre-em ! Easy.

Are there any other times in rotation when we can use allelopathy to save chemicals and get a better result ??

 

[shakerator]

Here`s a research article about allelopathy, unfortunately it`s in german, so might be useless for most of you ....

http://www.pflanzenforschung.de/index.php?cID=10651

The basic message is, that grasses like wheat are releasing rhizosphere-exudates with a specific chemical structure which belong to the group of DIBOA and DIMBOA (you can spot the chemical name in the text then) which get metabolized to APO and AMPO. Researchers compared the herbicidal effect of APO with Pendimethalin and found out that APO is more effective !!

That`s what my observation is already since some years when I grow spring beans without broadleaf herbicides - just DDed into an oats covercrop, some glyphosate to get rid of any AMG (maybe not even needed after Strigosa) and a late graminicide before row closing, job done and the field is cleaner comes harvest than neighbouring field same treated but without the oats CC but with a full dose of pre-em ! Easy.

Are there any other times in rotation when we can use allelopathy to save chemicals and get a better result ??

I have over wintered oat volunteers and found big wheat seeds manage to just emerge, but roots initially pruned by acids of oats dying. This is too much for smaller seeds like BG and blw's until far later in the season, with probably a longer affect than liberator type chemistry

I know the book. " alleopathy in agrecosystems" talks about the possibility of barley leaf extract as a commercial herbicide.

Then there is syngentas active in Callisto maize herbicide from the bottle brush plant.http://www.syngenta.com/global/corp...tion/active-ingredients/Pages/mesotrione.aspx

My guess is there are many more options available on the farm as opposed to those viable to commercially "bottle & exploit"

 

[rob1]

I have a field that was part westerwold grass part fallow and part wheat, it was DD first couple of days of Oct the bit where the fallow is is quite a bit better than after the grass with the bit that had wheat is in the middle, the grass was sprayed of following drilling apart from a few square metres where I used up a few litres of some glyp and dursban that I had left from a customer, looks like the dying grass is having an effect. will be interesting to see how it goes through the season

 

[Simon C]

The great thing about beans is that they will grow just about anywhere, however much residue or living cover you have. Other big seeded crops like soya or lupins may be the same but have yet to prove their reliability, year in, year out. The only other one is peas, but in my experience, they are particularly fussy what is already growing or laying around when they are coming up.

It would be great to find some other ways of utilizing allelopathy because our present heavy herbicide use is messing up a lot of other things.

 

[Brisel]

Here's Jim Orson's view on alleopathy in blackgrass: http://www.niab.com/blog/post/156

Subsequent trials showed lower blackgrass levels in the following crop from repeated glyphosate doses on each flush pre drilling. Sorry Simon, that doesn't discourage heavy herbicide use!