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The 1949 Iowa Corn Yield Test
Joseph Lee RobinsonCharles D. Hutchcroft
出版Agricultural Experiment Station, Agricultural Extension Service, Iowa State College, 1950
URLhttp://books.google.com.hk/books?id=8BciAQAAMAAJ&hl=&source=gbs_api
註釋"The Iowa Corn Yield Test is conducted by the Iowa Corn and Small grain Growers' association in cooperation with the Iowa Agricultural Experiment Station. The purpose is to compare the performance of hybrids that are offered for sale to farmers. We hope the information in this bulletin will help you to choose the best hybrids available for planting in 1950." -- p. [493]