Solid science SS121 Spring2007 - O Instructor’s Copy WK...

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Unformatted text preview: . , . O - ' Instructor’s Copy WK Name _ J , -- .. . E Z l S 31 M0 FIZVNZIdMZIhodo Known Sm am es USDA Tamra. Class Soil Charactensfies ( ttiness, stickiness, ribbon len 11, etc) \ 1 “th9 53‘“, SHIV/”l loamy M714 2 mmmmm. ,s’n‘LH, V1031] njjjmss {21191 ( 3511101111012 TYW) lea mm mm W 4 s 5WOTh 5 :‘illfl clay 5 ' a 0\ bu. smao’m 511 mm Texture Questions 1. Define soil texture. prMJW—uc 2. What differences do you notice between the feel of the sand and the feel of the clay separates? WWW 3. Practice dcterminin the textural class for followin soils. Soil Sample Sand Silt Clax USDA Soil Textural Class % by mass A 65 25 10 sandy 1mm B 35 35 30 {351% \M m' / C 25 so 25 L0 Wm XV) D 15 U5 20 .3- \3( XML!!! E 40 15 45 (X F 15 53 :51 \ \V\\ll/\ 77 % 1 3— 4. What is the lowest clay percentage allowed for a texture to be classed as: / ' - . . , , \vx \tfl Clay at 0 /- Silty clay 4‘0 /. Sandy clay 351 . Iioain(‘/%i&£~ ‘ )< 5. What is the lowest silt percentage allowed for a texture to be classed as: /O Clay m Silty clay mm (10 Sandy clay R0 Loam 50 6. A dry soil sample-weighing fig grams contains 3 grams of sand, l 0 grams of clay, and the remainder is s11t. Calculate the percentages of sand, silt and clayfi determine the soil's textural class. Show the appropriate units and complete setup for each calculation of this 4%53'47 ‘D/as’Jl 55/551241 3: {- %Sand= ‘l—l ,%Silt= 4| ,%Clay= % H \L 7. A moist soil sample containinggg grams of water and 3 grams of organic matter weighs a total of filigrams This soil contains fl % sand, 9.; grams of silt, and the remaining mineral fraction is clay. Calculate the grams of sand, the percentage of silt, and the grams and percentage of clay in the sample. What is the soil's textural class? Show the appropriate units and complete setup for each calculation for this problem. \55‘ A5 :- [10 561M: 546} 3M":— 4%fi C/W‘j '2 1397) grams sand 54' g grams silt 4'53 grams clay 6:] % sand 4 O % silt 23 % clay l l USDA textural class = (MW /' 4’” \g/ 78 x 8. Which soil separate will settle most rapidly to the bottom of a lake? KmhA \. V i . ¥ 9. ‘Which soil separate contributes most to the turbidity in a lake? (A dictionary may help in defining turbidity.) Why? M mummies blah {V \tdotbwt St M m so m OHM Soufltlw ’r WWI Nate mm Wfler 1. Draw a picture of the various soil conditions/structures on display. 2. Use the soil monoliths to answer the following questions. a.' Name a soil which has a granular structure. mmo 3th { 5 >67 b. Which horizon fi'oma “ ” has granular structure? l E p c. Name a soil which has a prismatic structure. : SW y ta 5) (1. Which horizon fi'omc “ ” has prismatic structure? 3/ Structure Questions 1. Define soil structure. er ow are s01] terig/ure and structure a“ ct (if a albgosyofl compaSct'ion? Textureis MI “I 11 [g]: (.4 . ‘57 3:“ / X\ StructureisVfl QIfiiiflZl haugggg II S M (X 1m 11% 4. Name five ceme t1ng agents im flan/”he formation of soil StI'llCtUl. % 01/ MIL Wmflv/ mum Cleoovates ' 5. Which structure 1s consider the best for ahome garden? YM% 4—1\WM J<\ , 9mm! {BY Y'hu’mtmsiv 124an W as 5in wa+w accessfirmrrls. 6. How 1s the water infiltration rate into a clayey soil afi‘ect byso Astructure? 501115 \l ' an at in ltration Wgte intgg Iaz’llc‘lzyfsoilw affl fflfiecrbysoA'PEtg/uéture.o 1/6 A Watts 1L 1) 1s a 111% Mada (waffle Epype gps%&lst¥11ctge+ common] WW’QMAW ganon— distDIheig Mag/Lu - W10 15 1 10 In the hield—qexnI/g, Structylg'eta and Soil ”Sim 0k wi h a gtirbore Sam ler Site Parameter A B C Ring #5 Ring weights (g) 6 Location f Vegetation USDA Textural Class EM (”jib “g X figIOJ “I“! SKI :9? ma m Structure ...
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