| 摘要 |
Anitrate-nitrogen-reducing agent for a farm product, comprising as an active ingredient a hydroxide solid solution represented by the formula (1), [(M12+)1-x(M22+)x]1-z(M3+)z(OH)2(An−)z/n·mH2O (1) wherein M12+ represents Ca and/or Mg, M22+ represents at least one essential mineral selected from Fe, Mn, Zn, Cu, Ni and Co, M3+ represents at least one trivalent metal, An−represents an anion having a valence of n, x is a positive number in the range of 0<x<0.5, m is 0 or a positive number in the range of 0≰m<10, z is a positive number in the range of 0<z<0.4, and n is a positive number in the range of 1≰n≰10, and/or the formula (2), (M12+)1-x(M22+)x(OH)2 (2) wherein M12+, x and M22+ are as defined in the formula (1).
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