US Patent 7846416 Soil conditioner

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).