Gypsum, or calcium sulphate, is well established as a means of displacing sodium ions from soil, where it reverses the effects of salt build-up. It also acts as a nutrient. But in its more familiar granular form it is cumbersome to apply and slow to act, said Church.
He added that the liquid product, which is new to the UK market, is developed and manufactured in Australia, where salt build-up in soils is a pressing concern. It is already approved for organic use in Australia.