By Felsner S.

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Extra resources for A 32-Approximation for the proportionate two-machine flow shop scheduling with minimum delays

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In the presence of pure water, the release of potassium and sodium is accomplished by the hydrogen ions of the water in accordance with the following hydrolysis equation: Potassium and sodium released in this manner may be readsorbed during the subsequent migration within the soil mass. Laboratory experiments (11) have demonstrated that CaCOs has a pronounced effect on the exchange of monovalent ions as indicated by the following general equilibrium reaction: Ca enhances the release of K and Na and, in addition, reduces their readsorption, because of effective competition.

He arranged the data in the form of two development series as follows: Cobb's analyses, recalculated to molecular values, are plotted in Figs. 31 and 32. The ba values, or the base-alumina ratio that reflects the leaching of potassium, sodium, and calcium, and the relative FIG. —Comparison of relative base status of soils derived from acid and basic igneous rocks. ) accumulation of aluminum, show perceptible differences only in the earlier stages of weathering and soil formation. Basic igneous rocks and young soils derived from basic igneous rocks have higher 6a values than the granites and gneisses.

This condition tends to shift the soil climate toward aridity. In northern Europe Scherf (26) observed brown forest soils on heavy ground moraines, whereas adjacent sands were strongly podsolized. Polynov (22) discusses the intrusions of podsols into the tundra zone and into the south Russian chernozem belt. In the latter region, wherever there exists a contact zone of loess and sand, steppe profiles are associated with the loess, whereas podsolized forest soils have developed on the sands. Similar physiographic complexes are found in central Oklahoma.

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