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Tray dryers (Practical Action Technical Brief)
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=== Economic considerations === When processing food its value is increased but the value added per kg processed must be cover all the costs involved such as labour, fuel, rent and depreciation costs. In general very little value can be added to low value foods such as cereals and root crops. For this reason it is only economic to dry such commodities in very large plants. Considerable value can however be added to certain fruits, herbs, nuts, spices and vegetables such as mushroom or asparagus. These are the foods most commonly processed by small and medium drying enterprises.
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