In article , T wrote:

My soil is very alkali. Is this a good idea?

https://www.amazon.com/Down-Earth-17...011L3T6BS/ref=
sr_1_5?ie=UTF8&qid=1478841441&sr=8-5&keywords=humic+acid

It's likely highly cost-inefficient .vs. an actual source of humus,
(compost or compostable materials) which comes with humic acid as a free
byproduct. If you want something compact and _somewhat_ reasonable to
buy mailorder that will affect your soil pH, consider sulfur.

http://extension.usu.edu/files/publi..._Soils_2003-02.
pdf

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