I reccommend pulling up some of the plants you can see. Then plant an aggressive grass like perrennial ryegrass, hopefully it should take over. Could plant some white clover as well, it does take over a bit, but its pretty and its good for the soil. It adds nitrogen.
The salt may work, but its not good for the soil. Only use in small area's on the base of the plants.
DO NOT USE ROUND-UP! Theres absolutely no need for that poison under any circumstances.
Some weeds have become resistant to chemicals, chickweed being one of them.
Just keep at it and make sure you get the roots when you dig. Pull them up and plant some of the grass mix in its place. You should get it eventually.
Collect the seed capsules BEFORE they are ripe and dispose of them (not in compost bin obviously), even cut off the flowers when you see them.
The best way would be to plough the ground a few times and reseed with the perennial ryegrass mix each time. This may not be practical though.
Covering the emerging plants with sand heaps may help to eradicate them, and cutting larger plants low and covering with sand.
You could eat the leaves of the ones you pull up. They are very good for you. Give some leaves to pigeons/ducks/chickens/pigs if you have any. All wild veg is more nutrient rich than cultivated veg. Wild animals are healthier than the linebred domestic breeds too.
Anyway, good luck and I hope you sort it out!
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