Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 69American Philosophical Society, 1930 |
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Сторінка 59
... organic matter . However , iron - oxide and aluminum oxide , other important constituents of soils and rocks , are less soluble in pure rain- water and salt solutions , but are rather easily soluble in humus - laden water . So it is ...
... organic matter . However , iron - oxide and aluminum oxide , other important constituents of soils and rocks , are less soluble in pure rain- water and salt solutions , but are rather easily soluble in humus - laden water . So it is ...
Сторінка 61
... organic matter . Under such conditions iron will be removed , whereas silica will persist and increase proportion- ately . The result is a light colored soil , almost white , resting under a layer of black humus . This light colored ...
... organic matter . Under such conditions iron will be removed , whereas silica will persist and increase proportion- ately . The result is a light colored soil , almost white , resting under a layer of black humus . This light colored ...
Сторінка 91
... organic matter at all depths . This organic matter , acting as a protective colloid , enables the ferric hydroxide to remain a long time as a hydrosol , so that it can be carried downward for great distances in the percolating soil ...
... organic matter at all depths . This organic matter , acting as a protective colloid , enables the ferric hydroxide to remain a long time as a hydrosol , so that it can be carried downward for great distances in the percolating soil ...
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