Wally's Ammonium Sulphamate 2kgUsed at 200 grams per litre of water (5 scoops of scoop supplied) on a sunny day when the ground is on the dry side it will compost weeds where they are growing within hours of application.
If conditions are not as above then they will compost over a period of a few days. Do not spray on preferred plants as it can kill them also.
Used as a soil drench over the foliage of oxalis it will compost the bulbs in the soil as well as the foliage.