Thank you very much to all of you for your advice and suggestions. I was wondering where I would be able to get sun hemp seeds until I saw a picture of it - I know what tha mysterious plant nobody new the name of but knew it was beneficial is now. I’ve collected the seeds and will have to multiply them first.
We grow annual crops in between the lines of trees and this is where we need to control the weeds. I’m not too worried about them along the tree lines as we cut them and as the mulch builds up it should smother them. The annual crops are maize, sweet potato, mung beans. Other than later in the dry season when we sow squash in the treeline so they get watered with the bananas we don’t grow vegetables as it is often the quickest way to lose money here - pests and frequently low prices, unless there has been a typhoon in another major producing area. With both maize and sweet potatoes the practice here is to ridge the soil, which doesn’t exactly go well with no till. The maize could be grown flat, although with the risk of waterlogging if it is very wet but is it possilbe to grow sweet potatoes without ridging?
Although I want to get to the point of no till and no chemicals my priority is to develop a transition that is feasible for other farmers who do plough and use chemicals, so if it meant using ‘one last spraying’ it’s not a big deal.