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The packaging of loose forage material into dense, self-contained units called wafers has long been of interest to farmers and animal scientists. Considering the bulk of conventionally packaged hay, many persons are willing to pay a considerable premium for the facility of mechanical handling and a reduction in storage space made possible with hay wafers. Hay-wafering machines are used commercially in such parts of the United States as California and Arizona. Two conditions are necessary to make wafers with these machines: (1) the alfalfa hay must contain no more than 10% grass and (2) the aver age moisture content of the hay must be no more than 10%. Much of the hay grown in Canada has a grass content that is significantly higher than the minimum required by these machines. In Ontario, alfalfa hay usually contains over 10% (and may contain as much as 50%) grass and, owing to prevailing high humidity conditions, field drying of large quantities of hay to the required moisture content is not possible.
feasibility of producing large-size hay wafers
Srivastava, A. C., Bilanski, W. K. and V. A. Graham 1981. FEASIBILITY OF PRODUCING LARGE-SIZE HAY WAFERS. Canadian Agricultural Engineering 23(2):109-112.
109 - 112