Hi Lorraine,
Thanks for the further info and questions... Nice map of the
project. Looks like you will be at a good phase in the project to be thinking through the design, and you are right that the keyline principles and design process will give great value at this stage.
At this point I don't know much more about the Magoye ripper than was in the pdf, as I've not actually worked with that tool (probably there is much more to find about it with some web research). Do think that it would have good potential though to at least mimic what is possible with the yeomans plow in places where it is too difficult or impossible to get a yeomans and
tractor, etc, out to. Possibly mules, burros, or horses would be adaptable if no oxen are around? My thought is that it may take some experimenting but that if we can adapt a ripper shank to the Magoye model, and use it on the keyline pattern, this could be an innovation that could take keyline ripping to the vast majority of the world that can't really access it at this time! How amazing would that be!? Perhaps we could work on developing this idea and practice through your project! A big deal!
As for the timing, Yeomans did recommend plowing after a little rain, but always said the next best time to do it is 'right now' - or as soon as you can... so the precise timing is not generally that critical. One exception is when the ground is too wet, particularly in clay subsoils, where ripping can 'slick - off' and seal the sides of the riplines, which inhibits rooting, etc...
Thanks for keeping the project going, for your enthusiasm, and commitment to the project!