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dichotomous_key_for_field_identification
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dichotomous_key_for_field_identification [2012/04/05 19:19] ddrummond created |
dichotomous_key_for_field_identification [2012/08/17 13:28] (current) 128.192.48.76 |
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| ====== Dichotomous Key for Field Identification of Soil Texture ====== | ====== Dichotomous Key for Field Identification of Soil Texture ====== | ||
| + | A. Soil when pinched between the thumb and finger, crumbles, will form no 'ribbon.' | ||
| + | |||
| + | B. Soil squeezed in hand when dry, falls apart readily: squeezed when moist, forms a cast that | ||
| + | breaks if not handled carefully. Individual sand grains can be readily seen | ||
| + | and felt....Sandy Loam | ||
| + | | ||
| + | B. Soil, squeezed in hand when dry, forms cast that bears careful handling; squeezed when moist, | ||
| + | forms a cast that can be handled quite freely without breaking. Soil smooth. Sand grains not readily | ||
| + | evident. | ||
| + | C. Soil slightly plastic when moist, but not greasy. Gritty when dry, not floury | ||
| + | Color brown or dark gray..............Loam. | ||
| + | |||
| + | C. Soil Greasy when moist, floury when dry. On wetting it runs together and puddles. | ||
| + | Color light gray or nearly white...........Silt Loam. | ||
| + | |||
| + | A. Soil When Pinched between the thumb and finger, forms a 'ribbon' at least barely sustaining | ||
| + | its own weight. | ||
| + | |||
| + | D. Ribbon breaks easily, barely sustains own weight. | ||
| + | | ||
| + | E. Individual sand grains can readily be seen and felt. Moist soil friable. Color usually | ||
| + | brownish yellow to brownish red...........Sandy Clay Loam. | ||
| + | |||
| + | E. Soil smooth. Sand grains not evident. Moist soil somewhat plastic. | ||
| + | | ||
| + | F. Soil heavy and greasy when moist. Color dully gray, sometimes containing iron | ||
| + | concentrations..........Silty Clay Loam. | ||
| + | | ||
| + | F. Soil Mellow and loose when moist. Color usually yellowish brown to reddish | ||
| + | brown....Clay Loam | ||
| + | | ||
| + | D. Ribbon is long and flexible, strong. | ||
| + | | ||
| + | G. Individual sand grains can readily be seen and felt. Moist soil somewhat friable. Color | ||
| + | usually bright red or yellow..........Sandy Clay. | ||
| + | | ||
| + | G. Sand not evident. Moist soil plastic. | ||
| + | | ||
| + | H. Color usually gray, sometimes containing iron concentrations......Silty Clay | ||
| + | |||
| + | H. Color usually dark red, often mottled with gray or yellow.........Clay. | ||
dichotomous_key_for_field_identification.1333653574.txt.gz ยท Last modified: 2012/04/05 19:19 by ddrummond
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