Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 69American Philosophical Society, 1930 |
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Сторінка 70
... color with no evidence of organic matter in them . They were sticky and stiff when wet , hard and cracked when dry , thus showing the characteristics of clay without humus . The rice and marsh soils ( Mohr's type No. 7 ) , next to the ...
... color with no evidence of organic matter in them . They were sticky and stiff when wet , hard and cracked when dry , thus showing the characteristics of clay without humus . The rice and marsh soils ( Mohr's type No. 7 ) , next to the ...
Сторінка 74
... color ; pH = 5.0 Samples of both horizons were taken and analyzed sepa- rately under the serial numbers 106 and 107 . In the air - dry condition the topsoil has a dark gray color and the subsoil a light buff color with a yellow cast ...
... color ; pH = 5.0 Samples of both horizons were taken and analyzed sepa- rately under the serial numbers 106 and 107 . In the air - dry condition the topsoil has a dark gray color and the subsoil a light buff color with a yellow cast ...
Сторінка 83
... color to all grades . While organic matter is still present in number 122 ( as also in 123 ) , yet its color is overshadowed by orange - red concretions of all sizes from 2 mm . down , the individual grains having a less regular shape ...
... color to all grades . While organic matter is still present in number 122 ( as also in 123 ) , yet its color is overshadowed by orange - red concretions of all sizes from 2 mm . down , the individual grains having a less regular shape ...
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facing 131 | 4 |
Ten Unsolved Mysteries of the Stellar Universe By HARLOU | 13 |
THE AMERICAN PHILOSOPHICAL SOCIETY HELD AT PHILADELPHIA | 17 |
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