PURPOSE:To obtain liquid calcium fertilizer or a culture solution which is free from formation of deposit and ppt. during distribution and excellent in shelf stability by incorporating gluconic acid or the precursor thereof into a calcium salt aq. soln. CONSTITUTION:This fertilizer or culture solution is obtained by incorporating calcium and gluconic acid or a compd. which is dissolved in water and forms gluconic acid. Gluconic acid utilized herein incorporates 50% aq. soln. thereof on the market and furthermore substance which is dissolved in water and isolates gluconic acid such as gamma- or delta-gluconic lactone or sodium gluconate. Gluconic acid is free from harmful action for plants excepting pH and stable. Furthermore calcium is supplied to plants without phytotoxicity and salt damage and also increased without increasing nitrogen component.
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