fiberboards were as shown in table 3 using the conditions as described in example 1 fiberboards were prepared with the additives used including peat taken in the amount of 15 based on the absolutely dry wood fiber mass the peat had an initial moisture content of 40 the quantity of phenol formaldehyde resin used as binder was 2 based on the absolutely dry wood fiber mass carbamide was taken in the amount of 18 based on the absolutely dry wood fiber mass fiberboard heat treatment time was 2 hours the physical properties were as shown in table 3 using the conditions as described in example 1 fiberboards were prepared incorporating peat as an additive in the amount of 30 based on the absolutely dry wood fiber mass the initial moisture content of the peat was 60 the quantity of carbamide used was 1 based on the absolutely dry wood fiber mass the binder quantity was 3 based on the absolutely dry wood fiber mass fiberboard heat treatment time was 2 5 hours the physical properties of the fiberboards thus obtained were as shown in table 3 using the conditions as described in example 1 fiberboards were fabricated incorporating peat as an additive taken in the amount of 45 the initial moisture content of the peat used was 50 the amount of phenol formaldehyde resin incorporated in the slurry was 8 based on the absolutely dry wood fiber mass the carbamide quantity was 0 2 based on the absolutely dry wood fiber mass fiberboard heat treatment time was 1 2 hours the physical properties of the fiberboards.