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The Rag-doll Seed Tester

其他書名	Its Use in Determining what Ears of Corn are Fit for Seed
出版	U.S. Department of Agriculture, 1918
URL	http://books.google.com.hk/books?id=eLg1zgEACAAJ&hl=&source=gbs_api

註釋"Almost every fall, hard freezing weather in one or more sections of the United States catches the corn crop in an immature condition and injures or destroys the ears for use as seed. The latest and sappiest ears are often killed, while other ears, somewhat drier have but a portion of the kernels killed. Frequently there are some ears so mature and dry that they are not injured or but slightly injured. Under such circumstances the uninjured ears are rated from suitable for seed. By inspection they can be separated from the green ears that were killed. However, some of the ears that appear mature and sound have been killed or are badly injured. To separate those ears from those that give a good germination, it is necessary to test the germination of a few kernels from each ear. The rag doll has proved a convenient and satisfactory way of making these germination tests. An effect method of making and using the rag doll is here described."--Page 2