Rubber as a protective device on concave teeth for threshing seed beans
1936
Millar, H.C. | Smith, F.B. | Brown, P.E.
The base exchange capacity and the nitrogen, carbon, and lignin contents of oat straw, wheat straw, sudan grass, cane sorghum, in cornstalks, millet, hemp, soybeans, alfalfa, sweet clover, and red clover were determined on the mature plant materials before composting and after 210 days, of decomposition. The results obtained may be summarized as follows: 1. Mature plant materials differ greatly in their base exchange capacity. 2. The base exchange capacity of 12 plant materials was significantly correlated with their lignin contents, and highly significantly correlated with their nitrogen contents. 3. No correlation was found between the base exchange capacities and either the carbon contents, acid-hydrolyzable fractions, or alcohol-benzene-soluble materials of the plants. 4. As the plant materials decomposed they increased in base exchange capacity many times more than they decreased in weight or in lignin content. 5. The base exchange capacity of the materials was not found to be in the same relation to one another as they decomposed. 6. The lignin content of the plant materials disappeared at the rate of from 24.71% in 210 days with one sample of cane sorghum to 54.80% in 210 days with one sample of soybeans.
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