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出版U.S. Department of Agriculture, 1930
URLhttp://books.google.com.hk/books?id=B31CAQAACAAJ&hl=&source=gbs_api
註釋"Peas rank third in tonnage among the canned vegetables in this country. Their production is centralized for the most part in the region about the Great Lakes. Because of their leguminous nature, canning peas fit admirably into a general farm rotation and have a marked influence in increasing the yield of crops which follow them. They may be used as a nurse crop for alfalfa and other stock-feeding plants or they can be followed during the same year with another crop. The pea crop requires a mellow, fertile, well-drained soil. the seed bed should be deeply prepared and left with a smooth surface to facilitate harvesting with a mower. The crop, as usually grown in drills like white requires no cultural attention after the seed is sown. Peas for canning pass their prime condition within a very few days. The crop must be handled promptly and the peas canned with dispatch to produce a product of high quality. The utilization of pea-vine refuse as feed is an important asset in dairy and stock-feeding regions. The growing of canning peas is a specialized industry requiresing the closes cooperation between the grower and the canner." -- p. 2