hi could any one assist me.
i have a raised onion bed in my pooly tunnel, and in the bed which is 6ft long- 3 feet high- 3 feet wide
i have compost and soil insitue,
the soil tests show a ph of alkaline at7-9.
i need to lower the p-h to a natural soil around 6.5 to 7
i am growing giant show onions in this raised bed next year-2017.
i have been told to add flowers elixir sulphur powder
but am not sure how much sulphur to add to this bed.
ken lumby.