The base exchange properties of soil organic matter
1931
McGeorge, W.T.
In the preceding discussion of the base exchange property of organic matter in soils, many phases of the problem as studied have been treated but briefly owing to limited space and to a desire to present as many observations as possible. In summarizing, the following should be emphasized especially: (a) The definite relationship existing between the organic C content of soils and their exchange capacities; (b) the value of H2O2 in determining quantitatively the organic exchange capacities of soils; (c) the exchange property of lignin and lignin-like bodies; (d) the similarity in chemical properties of the basic and acid salts of lignates and zeolites, such as hydrolysis, ionization, and the common-ion effect; and (e) the exchange capacity of unchanged plant materials which possibly leads us into a field slightly foreign to soil study. It is felt that the exchange property of green manures is one of considerable economic importance to agronomic practice and one which has been largely overlooked.
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