PLS 366- LAB PRACTICUM STUDY GUIDE
Texture by feel - Answers --flow chart guides through steps
-can it form a ball?
-how long of a ribbon can it form?
-how gritty does soil feel when its super saturated?
Hydrometer Method - Answers -Materials needed: hydrometer, boiscous cylinder
-key for first step: hydrometer should read ZERO when placed in deionized water
-measure at two time points: 40 seconds & 2 hours
-organic matter was burnt off soil
-soil was placed in tube with sodium hexametephosphate (separates soil aggregates)
-step 1: soil was mixed in solution to disperse it
-step 2: at 40 seconds, sand is in the bottom of cylinder, therefore the hydrometer is
reading how many particles of silt and clay
-step 3: at 2 hours silt and sand are at the bottom of the cylinder therefore, clay is the
only thing left
-step 4: use subtraction and division to find the percentages of each of the particles
-step 5: then use the textural triangle to determine the soil
Munsell Color Notation - Answers --hue, value, and chroma are given in the book
-if given those traits...be able to give the common name
soil structure - Answers -types:
-granular (a horizon)
-platy (b and e horizons)
-angular blocky (b hoirzon)
-subangular blocky (b horizon)
-columnar (b horizon, really only found in texas)
-prismatic (b horizon, really only found in texas)
-massive (c horizon and deep b horizon)
-single grain (only on the beach typically)
Soil series distinctions - Answers --taxonomic name (should be determined from group
of info)
-need to know soil order abbreviations
-alfs (alfisols)
FILL IN LATER
-climate in which they're found
-temp
-precipitation
- topography / slope
Texture by feel - Answers --flow chart guides through steps
-can it form a ball?
-how long of a ribbon can it form?
-how gritty does soil feel when its super saturated?
Hydrometer Method - Answers -Materials needed: hydrometer, boiscous cylinder
-key for first step: hydrometer should read ZERO when placed in deionized water
-measure at two time points: 40 seconds & 2 hours
-organic matter was burnt off soil
-soil was placed in tube with sodium hexametephosphate (separates soil aggregates)
-step 1: soil was mixed in solution to disperse it
-step 2: at 40 seconds, sand is in the bottom of cylinder, therefore the hydrometer is
reading how many particles of silt and clay
-step 3: at 2 hours silt and sand are at the bottom of the cylinder therefore, clay is the
only thing left
-step 4: use subtraction and division to find the percentages of each of the particles
-step 5: then use the textural triangle to determine the soil
Munsell Color Notation - Answers --hue, value, and chroma are given in the book
-if given those traits...be able to give the common name
soil structure - Answers -types:
-granular (a horizon)
-platy (b and e horizons)
-angular blocky (b hoirzon)
-subangular blocky (b horizon)
-columnar (b horizon, really only found in texas)
-prismatic (b horizon, really only found in texas)
-massive (c horizon and deep b horizon)
-single grain (only on the beach typically)
Soil series distinctions - Answers --taxonomic name (should be determined from group
of info)
-need to know soil order abbreviations
-alfs (alfisols)
FILL IN LATER
-climate in which they're found
-temp
-precipitation
- topography / slope
