Package: 4 lbs =1800g Sodium Chlorate 99%min (NaClO3) Herbicides For shallow roots use about 250g in 10lts over 20 sq yards. For deep roots use about 270g in 5lts over 6sq yards. Sodium chlorate is used as a non-selective herbicide. It is considered phytotoxic to all green plant parts. It can also kill through root absorption. Sodium chlorate may be used to control: morning glory, Canada thistle, johnson grass, bamboo, ragwort and St John’s wort. .