Studies on inoculated soybean. I. The importance of determining the number and size of soybean nodules for evaluating relative efficiencies of two or more cultures
1926
Erdman, L.W.
In 1925 different sized nodules were collected from Manchu, Dunfield, Peking, and Midwest soybeans. These nodules were divided into three groups according to size, namely, small, medium, and large. They were washed, dried, counted, and weighed, after which they were ground to a fine powder and analyzed for total nitrogen. Sufficient data were obtained to establish a definite relationship between the nodules of small, medium, and large sizes, and the importance of determining the number and size of nodules in studies on inoculation of soybeans was emphasized. A scheme of classification of the different degrees or intensities of nodulation on soybean plants based upon the results obtained in this study was suggested. It is concluded from the results of this study that the relative efficiency of two or more cultures for the inoculation of soybeans can be accurately determined only after the number and different sizes of nodules have been ascertained.
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