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Is it a Farm Pest?
出版U.S. Department of Agriculture, 1921
URLhttp://books.google.com.hk/books?id=q-qYkbBtOGUC&hl=&source=gbs_api
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註釋"The percentage of dockage is an essential factor in arriving at the true value of a lot of wheat. This dockage may consist of either useful or harmful foreign materials. The various methods of handling dockage should be carefully investigated and the one that is best suited to the needs of the local conditions should be adopted. When a large percentage of dockage is preset in wheat it is advisable to remove it on the farm or at the point of shipment and thus avoid paying the freight for the dirt, chaff, weed seeds, etc., on the basis of the rate for wheat. The farmer should get a higher numerical grade for his wheat under the dockage system of the Federal grades than he would under a system of grading that does not require a determination for dockage but lowers the grade on account of the total foreign material present in the wheat marketed at country points. The dockage system in operation protects the farmer from the possibility of low prices fixed by the local buyer in order to insure a safe purchase on a flat-rate basis"--Page [2]