In a nutshell....it was disappointing WJ. Not that I believe that the Glufosinate didn't do its job, but in the sense that under the circumstances I used it in - it was at a distinct disadvantage.
If you recall, I used the Glufosinate where I had great plots of alfalfa/clover which had been growing for 3 years. I drilled cereal rye into it (75#/acre) the previous fall in order to increase the C/N ratio prior to planting brassicas this July. I rolled the rye with a cultipacker and sprayed with Glufosinate the following day. Unfortunately, it is apparent to me that the heavy rye thatch covered a lot of the alfalfa/clover which prevented the herbicide from coming in contact with it. I drilled the brassicas after spraying, but unfortunately, although it did set the alfalfa/clover back some, it came right back and really provided a great deal of competition for my brassicas.
Also, since I did not terminate the alfalfa/clovers, I never got the benefit of the fixed Nitrogen which should have been available to the brassicas had they been adequately terminated. I haven't used any synthetic fertilizers for 2 years now and in this case, it was also apparent that the brassicas didn't really capture enough nutrients from the soil in order to grow well. The brassicas have been pretty much stunted since they germinated. That, and the fact that the deer have been all over them since about week 3.
I guess there are worse things than alfalfa and clover that could be competing with your brassicas, but I have to write off this experiment as pretty much a failure for a brassica planting. I still have lots of good forage in those plots....but I just don't have any good sized brassica leaves or bulbs.
I don't have any recent photos of these plots right now but here are photos of a couple of the plots where I drilled brassicas into alfalfa/clover plots where I had applied Glufosinate and then planted brassicas. These photos were taken on August 7th - about 3 weeks after planting. As you can see, the alfalfa/clovers are still doing well and the brassicas are struggling. Will try to get some more recent photos soon.
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If I do this again in the future, I would spray much earlier and ensure that the alfalfa/clovers are actually dead before planting. If I would have sprayed these plots 2-3 weeks after rolling the rye, much more of the alfalfa/clovers would have been exposed to the herbicide as you can see from the above photo.
Win some....lose some....and some get rained out