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good flowering relies on a combination of factors.
but generally speaking, I ensure there is sufficient Calcium and Phosphate at onset of flowering and subsequently I make sure there is sufficient Potash for flowering.
but to my mind your question is too general to generate any meaningful answers.
i added bone meal and got dark green healthy leaves... cant say it improved bud quality cos buds were still green at harvest time. but i added it and i did see a difference.