According to calculations for wood chips a chemical conservation appears economical if it does not cost more than 50% of the possible loss of material (SMITH, HATTON 1971). A cost analysis for practical conditions on the basis of a storage of 15.000 tons of dry bagasse, 120 days harvest and 250 days of production for three common methods of storage reveiled, that application of preservatives for DM 50, —- per ton of dry bagasse would still be economical. According to the results obtained a protection could be achieved for DM 30, — per ton of dry bagasse, so that a chemical treatment appears economical.