  88 dwarfs, covering the colour index interval 0.37 <(B-V)o <= 1.07 mag, with
metallicities -2.70 <= [Fe/H] <= +0.26 dex have been taken from three different
sources for new metallicity calibration. The catalogue of Cayrel de Stroble et
al. (2001) which includes 65% of the stars in our sample supplies detailed
information on abundances for stars with determination based on high resolution
spectroscopy. 77 stars which supplies at least one of the following conditions
have been used as "corner stones" for constructing the new calibration: (i) the
parallax is larger than 10 mas (distance relative to the Sun less than 100 pc)
and the galactic latitude is absolutely higher than 30 degrees, (ii) the
parallax is rather large, if the galactic latitude is absolutely low and vice
versa. Contrary to the previous investigations, a third-degree polynomial
fitted for the new calibration: [Fe/H] = 0.10-2.76d-24.04d^2+30.00d^3. The
coefficients were evaluated by the least-square method, without regarding the
metallicity of Hyades. However, the constant term is in the range of
metallicity determined for this cluster i.e.: 0.08 <= [Fe/H] <= 0.11 dex. The
mean deviation and the mean error in our work are equal to those of Carney
(1979), for [Fe/H] >= -1.75 dex where Carney's calibration is valid.
