Dear Mônica Bossardi Coelho what exactly are you looking for? If you don't want to use HCl, you have two alternatives: use other chemical than HCL, or don't adjust th pH of culture media. In both case, it'll be consequences. Thus, you must to assess (assume) your risks under your conditions
I would suggest some organic acid: citric acid, ascorbic acid....
Sorry to bump old question but this has become a serious issue for me today so sharing
If your plant species can't handle much chlorine you can use dilute phosphoric acid to adjust downward. If it also can't handle much phosphorus, use dilute acetic acid
For upwards adjustment most people use dilute KOH, because a lot of species are very sensitive to sodium. Where that adds too much potassium, you can also use very dilute aqueous ammonia
Everything dropwise, with checking inbetween. I'm finding some media recipes I've been working with have strange buffering properties. You don't want to be backward and forwarding beyond the recommended pH too often or you'll really throw off the recipe's specificity and precision
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