Growing sunhemp for a season

I had put sunhemp in one area of the farm and it was growing nicely and in some area there was grass also. I left it grow for a complete season and it flowered and produced seeds. I harvested some seeds and left the remaining there. This particular area was not watered, so it was natural growth. In the summer, all the grass and sunhemp dried and now this area is ready for cultivation. One thing to notice is that, just before the starting of rains, this area is completely clean of grass. If you see a adjacent area in the other farm, where there was grazing and watering, strong grasses are there. In this area, to do any cultivation, we have to first remove these strong grasses. But the area where the sunhemp was growing is ready for cultivation and we can start from zero grass, but now the crop should be established with the first rain, otherwise grass and sunhemp itself will come. I should have either collected all the sunhemp seeds or shouldn't have allowed to mature, since lot of seeds are in the soil which may interfere with the next crop. But it was nice to see that with heavy mulch produced by sunhemp grass has disappeared temporarily.

I also had another area in the farm where I had cut the grass at multiple times (at least twice in a year) and mulched and watering was done for cowpea cultivation. This area still has lot of grass and grass is growing very strong. So in my observation, grass gets reduced if the area is allowed to grow and then dry for a complete season without disturbing it.

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Adjacent farm - where watering, grazing was done.